A beach can lose meters of sand during a powerful storm and still recover naturally. You've probably already witnessed that at your local strand.

The problem becomes more serious when the beach repeatedly fails to recover, when sediment supplies have been reduced, or when buildings and infrastructure leave the shoreline with nowhere to retreat.

That makes coastal erosion a difficult engineering problem. The objective is not always to keep the sea away from the land, though.

In many cases, the more useful approach is to maintain the beach itself and give sediment enough space to move through the coastal system.

The available solutions range from adding sand and rebuilding dunes to constructing hard defenses, restoring interrupted sediment pathways and moving vulnerable infrastructure inland.

Add sand to the beach

When a coastline has a persistent sediment deficit, one of the most direct responses is beach nourishment, also known as artificial beach feeding.

Sand is brought from an approved source and placed on the beach or in the nearshore zone. Waves then redistribute the material along the coast and across the beach profile.

However, the goal is not to make the new sand stay exactly where engineers put it. Coastal processes will continue to move it.

The idea is to increase the amount of sediment available to the beach so that this natural movement does not expose the land behind it.

The Intergovernmental Panel on Climate Change (IPCC) identifies beach and shore nourishment as an established coastal adaptation measure, while noting that its effectiveness, environmental effects and long-term costs depend on local conditions.

Portugal is using this approach on a large scale.

In 2026, the Portuguese Environment Agency (APA) began a project between Quarteira and Garrão involving approximately 1.4 million cubic meters of sediment along 6.6 kilometers of coastline.

The project is expected to increase average beach width by about 37 meters.

Nourishment does have a weakness. The added sand remains subject to waves and currents, so some of it will eventually move elsewhere.

Where longshore transport is strong, or erosion is persistent, nourishment can therefore require repeated applications.

A US Army Corps of Engineers (USACE) project in California, for example, incorporates a planned 10-year renourishment cycle because normal sediment transport continues to remove material from the restored beach.

Nourishment is consequently most effective when it is treated as part of long-term sediment management rather than as a one-time repair.

Rebuild the dunes

The beach is only one part of the coastal sediment reservoir.

Wind carries dry sand inland, where vegetation can trap it and help form dunes. During major storms, waves can erode those dunes and return some of the stored material to the active beach system.

Restoring dunes can therefore provide both physical protection and additional sediment storage.

Projects can involve rebuilding damaged dunes, encouraging vegetation, setting wooden fences, and controlling access where people repeatedly damage fragile surfaces.

The IPCC identifies dune restoration as an ecosystem-based coastal adaptation measure, while the US Army Corps of Engineers includes dunes among natural and nature-based features that can contribute to coastal risk reduction.

Dunes are not permanent barriers. A severe storm can remove large amounts of sand from them.

Their value lies partly in their ability to absorb that disturbance and rebuild when sediment becomes available again.

Give the shoreline room

Sometimes the best way to reduce future erosion damage is to keep development away from the area that will eventually be affected.

Coastal setback rules are based on this principle.

By keeping buildings and infrastructure farther inland, authorities can leave room for the shoreline to migrate without immediately threatening property.

The IPCC identifies avoiding new development in exposed coastal areas as an important adaptation option.

It also recognizes accommodation and relocation as possible responses where continued occupation becomes increasingly difficult.

It's an approach that is particularly important on beaches backed by dunes or other natural areas.

A shoreline that has space to move can adjust to changing waves and water levels; a shoreline trapped between the sea and fixed infrastructure cannot.

Build a seawall

When important infrastructure is already exposed, a seawall can provide direct protection against waves and coastal flooding.

Seawalls are established engineering structures and can be appropriate where roads, ports, buildings, or other critical assets cannot easily be moved.

The US Army Corps of Engineers includes seawalls and revetments among the structural measures used to reduce coastal risks.

The difficulty is that protecting the land does not necessarily preserve the beach.

NOAA notes that hardened shorelines can interfere with the natural movement of sediment and restrict the ability of beaches and intertidal habitats to migrate inland as sea levels rise.

This can create coastal squeeze. As the water moves landward, a natural beach can migrate with it.

A fixed wall prevents that movement, leaving the beach increasingly compressed between the structure and the sea.

A seawall can therefore be highly effective at protecting a specific asset while contributing to the long-term loss of the beach in front of it.

Interrupt the sand highway

Some erosion problems are caused by the way sediment moves along the coast.

Waves approaching at an angle generate currents that transport sand parallel to the shoreline. Structures such as ports, jetties, and groins can interfere with this process.

A groin, for example, is built across the beach to interrupt part of the longshore transport. Sediment accumulates on the side receiving the transport, which can widen that section of beach.

But the sand retained by the structure is no longer traveling toward beaches farther along the coast.

The US Army Corps of Engineers notes that groins can therefore produce accumulation on one side while reducing sediment supply on the other.

This is why a groin can solve a local erosion problem while creating another farther down the coast.

The same principle applies to larger coastal structures.

A harbor can alter sediment transport over a much greater distance, particularly when it interrupts a major longshore pathway.

Put the sand back downstream

When infrastructure has interrupted the natural movement of sediment, engineers can sometimes restore the pathway rather than continually treating the beach where erosion appears.

One method is sediment bypassing.

Sand is mechanically transferred around an obstruction, such as a harbor entrance, and placed back into the downstream coastal system.

The approach is already being examined in Portugal.

The Portuguese Environment Agency has assessed artificial sediment transfer at Figueira da Foz, including bypassing systems, as an alternative to conventional nourishment.

In a way, it changes the question being asked.

Instead of repeatedly replacing sand at the beach where it disappears, engineers can investigate why the sediment is no longer reaching that beach in the first place.

That can be a more fundamental solution when the cause of erosion is an artificial interruption in the coastal sediment pathway.

Reduce the waves

Another approach is to change the wave energy reaching the shoreline.

Offshore breakwaters can reduce wave energy before it reaches the beach. Their presence also changes the local wave field, which affects where sediment is deposited.

Again, the US Army Corps of Engineers identifies nearshore breakwaters as structures that can reduce shoreline erosion and storm wave damage.

Their effect depends heavily on their location, geometry, and relationship with the seabed.

Changing the wave field changes sediment behavior as well, so the result needs to be considered beyond the immediate area behind the structure.

A breakwater can therefore be designed to reduce erosion at a particular shoreline, but it does not remove the need to understand the wider coastal sediment system.

Work with natural defenses

Some coastlines can benefit from restoring habitats that already reduce wave energy and retain sediment.

Depending on the environment, these measures can include dunes, salt marshes, mangroves, oyster reefs, coral reefs and seagrass. The broader approach is commonly described as a nature-based solution.

NOAA describes living shorelines as an alternative to hardened structures in suitable coastal environments.

They can combine vegetation with materials such as sand, rock, or oyster shells to stabilize shorelines while providing habitat.

Their application is not universal.

NOAA notes that living shorelines are generally more appropriate for sheltered environments such as bays, estuaries and tidal waterways than for exposed open ocean beaches with high wave energy.

That limitation is particularly relevant.

A nature-based solution is still an engineering intervention, even when it looks more natural. It has to match the physical conditions of the coastline.

Research also shows that there are still uncertainties about how some natural and nature-based features perform during extreme events and where their protective capacity reaches its limits.

Move the infrastructure

There are coastlines where permanent protection becomes increasingly difficult.

In such cases, managed retreat means moving buildings, roads or other assets away from an eroding shoreline rather than continually defending their existing position.

The IPCC recognizes strategic retreat, relocation and resettlement as coastal adaptation options.

We know it can be difficult because relocation affects property ownership, local economies and communities. It can also be politically harder to accept than constructing a new defense.

Physically, however, the principle is straightforward.

If the shoreline is expected to continue moving inland, moving the infrastructure can remove the asset from the path of that movement.

Know what is actually disappearing

Before choosing a solution, coastal engineers need to establish what is happening to the sediment.

A photograph can show that a beach has become narrower, but it cannot establish whether the missing sand has moved offshore, traveled along the coast or left the wider coastal system.

Repeated surveys provide a much better picture.

Measurements of beach width, elevation and sediment volume can reveal whether a beach is recovering after storms or accumulating a longer-term deficit.

Portugal's monitoring program provides a recent example.

Following the storms of the 2025 to 2026 maritime winter, the Portuguese Environment Agency surveyed 27 mainland beaches and compared their condition with historical data.

About 41 percent had recovered to or exceeded their historical average values for beach width and sediment volume, while 59 percent remained below those historical references at the time of assessment.

The agency also found that recovery was gradual and irregular and depended on subsequent hydrodynamic conditions, sediment availability, and beach morphology.

It's paramount to underline that a beach that looks severely damaged immediately after a storm may simply be in the middle of its natural recovery cycle.

A beach that repeatedly fails to recover is a different problem.

Protect the system, not just the beach

The largest coastal engineering projects increasingly operate at a scale bigger than the stretch of shoreline where erosion is most visible.

Figueira da Foz provides an example.

The Portuguese Environment Agency contracted a project involving more than 3.3 million cubic meters of sediment for the coastline between Cova Gala and Costa de Lavos.

The material is dredged offshore and placed in both the emerged and submerged beach zones to restore part of the sediment balance.

Historical monitoring in the area found that a three-kilometer section south of Cova Gala retreated by an average of about 5.5 meters per year between 2018 and 2021, compared with approximately 3.1 meters per year between 2010 and 2018.

Numbers such as these change the nature of the problem.

The question is no longer whether a single storm removed a large amount of sand but whether the coastline has entered a persistent sediment deficit and, if so, what is causing it.

The answer could help determine whether the appropriate response is nourishment, dune restoration, sediment bypassing, structural protection, development setbacks, or retreat.

Sometimes the answer is offshore

There is another option that is less visible from the beach: placing sediment beneath the water rather than directly on the shoreline.

Nearshore nourishment can add material to the submerged part of the beach profile, where waves can gradually redistribute it.

This can be useful where placing the entire volume directly on the dry beach would be impractical or where engineers want the sediment to enter the natural coastal system gradually.

The Portuguese Environment Agency's Figueira da Foz project includes both emerged and submerged beach nourishment, reflecting this broader view of the beach as an underwater and above-water sediment system rather than simply the strip of sand people walk on.

Ultimately, the beach does not end where the dry sand disappears beneath the waves.

Much of the material that appears to have been lost during a storm can still be sitting below the surface, waiting for the next phase of the coastal cycle to move it again.

A Kelvin wave is easy to misunderstand because the word wave suggests something that rises, curls, and breaks.

However, it does none of those things.

A Kelvin wave is a huge, slow-moving disturbance - like a bulge - in a rotating fluid, often buried beneath the ocean surface, and it can cross an entire ocean basin while barely announcing its presence at the surface.

That makes Kelvin waves particularly important in the tropical Pacific, where they help redistribute enormous amounts of heat and can provide some of the earliest signs that an El Niño is developing.

Kelvin wave is a different wave

A Kelvin wave is a type of long gravity wave whose motion is controlled by Earth's rotation and a physical boundary.

In the ocean, that boundary can be a coastline; near the Equator, the Equator itself acts as a kind of waveguide.

Gravity tries to restore a disturbance in the water, while the Coriolis effect caused by Earth's rotation changes the direction of moving water.

Under the right conditions, these forces can balance in a way that allows the disturbance to travel along a boundary without spreading freely across it.

This is what makes a Kelvin wave fundamentally different from the waves most people associate with the sea.

A wind wave is generated by wind blowing across the ocean surface, while a groundswell is a wind-generated wave that has traveled away from its source.

Their periods are normally measured in seconds.

A Kelvin wave belongs to a completely different scale of ocean physics.

Its dimensions can extend thousands of kilometers, its period can be measured in weeks or months, and some of its most important changes can occur hundreds of meters below the surface.

The phenomenon is named after William Thomson, better known as Lord Kelvin, who described the behavior of waves in a rotating fluid in the 19th century.

Kelvin waves also occur in the atmosphere, but when scientists discuss them in connection with El Niño, they are referring primarily to oceanic Kelvin waves in the tropical Pacific.

They are, in a way, internal waves that travel just below the ocean surface.

Why do Kelvin waves follow the Equator?

The key to an equatorial Kelvin wave is Earth's rotation. The Coriolis effect becomes weaker toward the Equator and changes sign across it.

It creates a special dynamical environment in which certain waves can become trapped around the Equator rather than spreading freely into either hemisphere.

Equatorial Kelvin waves therefore propagate eastward.

Their strength decreases away from the Equator, creating what oceanographers describe as an equatorial waveguide.

The ocean's vertical density structure is also crucial.

Warm, relatively light water sits above colder, denser water, with the thermocline marking the transition between the warm upper ocean and colder water below.

When a Kelvin wave passes through the tropical Pacific, it can move the thermocline substantially while also producing a small change in sea surface height.

The disturbance is therefore not simply a bump traveling across the surface but a large-scale rearrangement of the upper ocean.

Typical first baroclinic Kelvin waves in the tropical Pacific travel at roughly 2 to 3 meters per second, allowing a signal to cross the Pacific in around two to three months.

Their enormous wavelength and relatively slow evolution are another reason why they have little resemblance to ordinary wind-generated waves.

How Kelvin waves help create El Niño

Under normal conditions, the trade winds push warm surface water westward toward Indonesia and the western Pacific, leaving a relatively deep layer of warm water in the west and a shallower thermocline in the eastern Pacific, where cold, nutrient-rich water can reach the surface through upwelling.

A significant change in the tropical winds can disturb this arrangement.

Periods of weaker trade winds or bursts of westerly winds can generate an eastward-moving Kelvin wave.

Westerly wind bursts in the western Pacific are particularly important because they can reorganize the upper ocean and initiate a downwelling Kelvin wave.

As the wave travels east, it pushes the thermocline downward.

The warm upper layer becomes deeper, increasing heat content in the eastern Pacific and making it harder for cold subsurface water to reach the surface.

Sea surface temperatures can consequently rise.

The process is closely connected with El Niño, but a Kelvin wave does not automatically create an El Niño.

The development of an El Niño/La Niña-Southern Oscillation (ENSO) event depends on feedback between the ocean and atmosphere, including changes in winds, sea surface temperatures, atmospheric pressure, and tropical convection.

A Kelvin wave can be an important precursor without being sufficient on its own.

The 2014 Pacific warming provides a useful example.

A substantial downwelling Kelvin wave crossed the Pacific and produced strong ocean temperature anomalies, but the atmospheric response needed to sustain a full El Niño did not develop as expected.

Satellite observations have made these waves increasingly visible.

Radar altimeters can detect changes in sea surface height of only a few centimeters across enormous areas.

NASA observations have shown warm Kelvin waves around 5 to 10 centimeters high moving eastward through the equatorial Pacific, providing an early view of changes taking place beneath the surface.

Downwelling and upwelling Kelvin waves

There are two important phases of equatorial Kelvin waves.

A downwelling Kelvin wave pushes the thermocline deeper and is associated with increased heat content in the upper ocean. It's the type most closely associated with the development of El Niño.

An upwelling Kelvin wave raises the thermocline and allows colder subsurface water to move closer to the surface.

These waves can contribute to the cooling phase of ENSO and have been observed moving eastward beneath the tropical Pacific after El Niño events.

The two phases are not necessarily perfectly matched.

The ocean responds to the particular wind forcing it receives, so a cooling Kelvin wave is not simply a downwelling wave traveling backward.

Kelvin waves also have different vertical modes.

In a stratified ocean, the first and second baroclinic modes describe different vertical structures of the disturbance.

Observations of major El Niño events have shown that more than one mode can contribute to the observed ocean response.

Kelvin waves are not surfable waves or tsunamis

A Kelvin wave has almost nothing in common with the breaking waves seen by surfers beyond the fact that both involve gravity and water.

If that was a doubt you had or a myth you've heard of, it is now time to put an end to it.

As we've see above, wind waves are produced by atmospheric wind acting on the sea surface and normally have periods of seconds.

Swells are those waves after they have traveled away from their generating area.

A Kelvin wave, by contrast, is a planetary-scale disturbance involving pressure, gravity, Earth's rotation and the ocean's density structure.

It's like a large bed, measuring around a foot in height on average, moving, for instance, up the coast of Mexico, through California and on to Alaska.

It also should not be confused with a tsunami.

A tsunami is generated by the sudden displacement of a large volume of water, usually following an undersea earthquake, although landslides and volcanic activity can also produce one.

Tsunamis travel rapidly across deep ocean and can become much higher as they enter shallow coastal water.

Kelvin waves are normally generated by changes in wind stress and propagate along the Equator or a coastline.

Their surface expression can be only a few centimeters high, although the underlying disturbance may extend across an enormous part of the ocean.

A Kelvin wave does not arrive at a beach as a giant breaking wave.

What happens when a Kelvin wave reaches a coast?

The eastern boundary of the Pacific gives Kelvin waves another important role.

An equatorial Kelvin wave cannot continue eastward through the South American continent, so its energy can become associated with coastal trapped waves that travel along the continental margin.

A coastal Kelvin wave is guided by the coastline rather than the Equator.

In the Northern Hemisphere, it travels with the coast on its right, while in the Southern Hemisphere the corresponding relationship is reversed.

The Coriolis effect and the pressure gradient across the coast create the balance that keeps the disturbance close to shore.

So, this provides a remarkable oceanic connection.

A wind disturbance near the western tropical Pacific can launch a Kelvin wave that crosses the Equator, reaches South America, and then produces a coastal signal that travels northward along the Pacific coast of the Americas.

These coastal waves can change sea level.

The changes are modest compared with those produced by a tsunami, but several centimeters can matter when combined with king tides, storm surge and other sources of coastal water level variability.

During the 1997 to 1998 El Niño, Kelvin wave activity contributed to unusually high sea levels along the Pacific coast of North America.

Measurements around San Francisco showed an increase of roughly 15 centimeters associated with the event.

The same process was observed during the developing 2026 El Niño.

NASA tracked a warm Kelvin wave moving eastward across the Pacific, with sea levels off parts of South America more than 15 centimeters above the long-term average.

NOAA subsequently reported that the signal had reached the California coast as a coastal trapped wave.

The consequences for local communities can be devastating as an abnormally high sea level linked with large swells can obliterate public and private property close to the shore.

Kelvin waves and the marine environment

The movement of the thermocline has consequences well beyond sea level.

In the eastern tropical Pacific, upwelling normally brings cold, nutrient-rich water toward the surface.

The consequence supports highly productive marine ecosystems and fisheries. When a downwelling Kelvin wave deepens the thermocline, that supply of deep water can weaken.

During El Niño, the resulting reduction in upwelling can produce major changes in marine ecosystems and fisheries along the Pacific coast of South America.

It is one reason why oceanographers monitor subsurface heat content rather than relying only on sea surface temperature.

A Kelvin wave can reorganize the upper ocean before its full effects become obvious at the surface.

Kelvin waves also exist in the atmosphere

The ocean is not the only place where Kelvin waves occur.

The tropical atmosphere supports its own equatorial Kelvin waves, which also generally travel eastward.

Some are associated with tropical convection and with the Madden-Julian Oscillation, a large-scale atmospheric disturbance that travels eastward through the tropics.

Changes in tropical winds associated with such atmospheric disturbances can force oceanic Kelvin waves in the western Pacific.

Observations have found intraseasonal oceanic Kelvin waves with periods of roughly 30 to 90 days and speeds of around 2.4 meters per second.

Some have crossed more than 10,000 kilometers of the Pacific.

Atmospheric Kelvin waves also occur in the stratosphere, where they contribute to the transfer of momentum involved in the quasi-biennial oscillation of equatorial winds.

The oceanic and atmospheric versions are different phenomena, but they illustrate the same basic idea: Earth's rotation can organize disturbances into waves that travel preferentially along the Equator.

The hidden wave beneath the Pacific

Perhaps the most useful way to picture a Kelvin wave is not as a wave with a crest, but as a moving disturbance in the structure of the ocean.

A warm Kelvin wave can deepen the thermocline and increase upper ocean heat content as it moves east.

Satellites can detect its small sea level signature, while buoys and subsurface instruments reveal the accompanying changes in temperature, currents, and thermocline depth.

That makes Kelvin waves valuable to scientists watching ENSO.

A disturbance can begin with an atmospheric change in the western Pacific, travel through the ocean as a Kelvin wave, influence conditions thousands of kilometers away, and eventually reach a coastline as a trapped coastal signal.

The ocean is effectively carrying information across an entire basin.

And the Equator, despite having no physical barrier at all, is capable of acting as the guide.

On the morning of August 26, a sudden wall of water, ice, mud and rock swept through valleys along the Nepal-China border.

The disaster began high in the Himalayas and quickly moved downstream through the Lhende Khola, Bhote Koshi and Trishuli river systems.

By August 28, at least 543 people had been confirmed dead in Nepal and Tibet, according to the latest Associated Press (AP) reporting.

More than 1,500 people were missing.

The figures were still rising as rescue teams reached areas that had been cut off by destroyed roads and bridges.

The disaster affected both sides of the border.

In Nepal, entire settlements were inundated, and major transport and electricity infrastructure was destroyed.

In Tibet, the Gyirong border area suffered a massive mudslide, cutting roads and communications and leaving hundreds of people missing.

The event was initially thought to have been triggered by an earthquake. That explanation was later rejected by the U.S. Geological Survey.

The evidence now points to a much more unusual chain of events involving the collapse of part of a glacier, an ice and rock avalanche, a temporary blockage of a river and the sudden release of the resulting flood.

What happened in the Himalayas

The first major failure occurred at high altitude.

Satellite imagery examined after the disaster showed that a substantial section of the lower part of a glacier had broken away at an elevation of roughly 5,200 meters.

The detached material fell about 1,200 meters toward the valley below, carrying ice, rock and sediment with it.

The avalanche entered the Lhende River, a tributary of the Bhote Koshi. The mass of ice and rock temporarily blocked the river.

When that natural dam failed, water and debris were released downstream with enormous force.

This explains one of the most striking features of the disaster. There was no need for heavy rain to produce the initial flood.

Local officials and journalists reported that the weather was relatively dry when the flood arrived. The water came from a sudden failure high in the mountain system.

The International Centre for Integrated Mountain Development (ICIMOD) said preliminary evidence indicated that a large volume of ice and rock debris had entered the Lhende Khola.

Its researchers recorded an extraordinary rise in river levels.

At Galchchi, the Trishuli River reportedly rose by as much as nine meters in 30 minutes. At Malekhu, the increase was about seven meters over a similar period.

That speed left little time for people downstream to react.

The flood traveled through the Bhote Koshi and into the Trishuli system, affecting areas including Rasuwa, Nuwakot and Dhading.

The water carried enormous quantities of sediment and boulders, turning the flood into a destructive mixture of water and debris.

The earthquake theory was ruled out

The first reports suggested that an earthquake measuring about magnitude 4.4 might have caused the glacier collapse.

That interpretation changed after the U.S. Geological Survey examined the seismic signal.

According to the USGS assessment reported by Al Jazeera and Reuters, the signal was produced by the landslide itself rather than by an earthquake.

The collapsing mass generated seismic energy as ice and rock moved down the mountain. The event was later measured as a magnitude 5.2 seismic signal.

It's a distinction that matters because earthquakes and glacier failures require very different warning systems.

An earthquake can sometimes be detected seconds before its strongest shaking arrives. A glacier collapse can occur without a conventional earthquake warning at all.

In this case, the immediate trigger was a mountain slope and glacier failure.

The deeper question, though, is why that glacier became unstable.

Why the flood was so destructive

The geography of the Himalayas amplified the initial failure. The affected rivers run through narrow mountain valleys.

Once the ice and rock entered the river system, the flood was channeled through these confined spaces.

The material carried downstream increased the destructive force of the water and buried structures under thick deposits of mud and debris.

The flood struck populated areas as well as major infrastructure.

In Nepal, houses, vehicles, bridges, roads and power facilities were swept away or buried. Video from Gyirong in Tibet showed a mass of mud and debris moving through the border area and engulfing buildings.

Nepal's Department of Roads reported preliminary damage to at least 19 bridges and about 40 kilometers of roads. The department stressed that the assessment was still incomplete, so those numbers could increase.

The damage to the electricity system was also substantial.

A preliminary assessment from Nepal's Ministry of Energy, Water Resources and Irrigation found that 27 power projects with a combined capacity of about 901 megawatts had been affected, including operational projects and projects under construction.

Twelve operating projects, representing about 431 megawatts, were severely affected.

Among the affected facilities were the 111 MW Rasuwagadhi project, 22 MW Chilime project and 60 MW Upper Trishuli 3A project. Transmission lines and substations were also damaged.

The flood swept away the substation at Pairebesi and affected the Trishuli and Devighat hydropower centers, according to the Nepal Electricity Authority.

The damage disrupted electricity supplies and complicated rescue operations.

On the Chinese side, the mudslide cut roads leading to Gyirong Port and disrupted communications and electricity supplies.

Chinese authorities sent repair crews to restore the power network and imposed traffic restrictions on roads leading to the port.

The destruction of roads had another consequence. It made it much harder for rescuers to reach people who survived the initial flood.

A rapidly rising death toll

The first casualty reports on August 26 were small compared with what became known as the scale of the disaster.

By late August 26, Nepalese authorities had recovered 157 bodies, and China had reported three deaths in Tibet. By August 28, the AP was reporting at least 543 deaths across the two countries.

The number of missing people was even more uncertain.

Nepal's National Disaster Risk Reduction and Management Authority reported 826 missing people in Nepal on August 27.

Chinese state broadcaster CCTV reported 558 missing in Tibet's Gyirong county, including 260 foreign nationals.

Together, those figures put the number missing at more than 1,500. However, the figures should be treated as provisional.

Some people initially reported missing may eventually be found, while others may be confirmed dead as search teams move through areas covered by mud and debris.

Foreign visitors made up a particularly large proportion of the missing.

Nepalese authorities reported hundreds of foreign nationals among those unaccounted for.

The missing included citizens of India, the United States, Australia, the United Kingdom, Canada, South Korea, Malaysia, the Netherlands, Portugal and South Africa.

Many were traveling through the region for trekking or religious pilgrimages. The route is also used by people traveling toward Mount Kailash and Lake Manasarovar in Tibet.

Among the missing were Nepalese police officers who had been stationed in the affected region. Earlier reporting put the number of unaccounted-for police personnel at 28.

The human toll is likely to remain uncertain for some time. Bodies have been found downstream, and the flood carried debris far beyond the locations where the initial destruction occurred.

Why was there so little warning?

Flash floods are difficult to predict even when their cause is well understood.

In this case, the event was especially difficult because the initial failure happened high in a remote mountain environment.

The flood was generated by a sudden geological and glacial process rather than by a conventional rainstorm.

The first reports also show why early information can be misleading during a disaster.

The seismic signal was initially interpreted as an earthquake.

Only after satellite imagery and geological analysis became available did the glacier-collapse explanation become clear.

ICIMOD scientists were able to reconstruct part of the event from satellite imagery, videos and river observations.

Their early assessment suggested an ice-rock avalanche, but they also stressed that investigations were continuing.

The danger did not necessarily end when the first flood passed.

Chinese authorities warned about another potential flood hazard caused by water accumulating behind a blockage upstream.

Continued rainfall in the Gyirong area also raised concerns about secondary landslides and flooding.

Where does climate change fit into the story?

Now, here's the most complicated part of the disaster.

There is strong scientific evidence that global warming is changing the Himalayan cryosphere. There is also evidence that climate change is increasing several types of flood and landslide risk in the Hindu Kush Himalaya.

But that does not mean scientists can already say that global warming caused the August 26 glacier collapse.

There is an important difference between identifying a physical trigger and attributing the long-term conditions that may have contributed to it.

The immediate trigger is now relatively clear.

An ice and rock mass detached from a glacier, entered a river, temporarily blocked it, and produced a catastrophic flood when the blockage failed.

The evidence connecting that specific collapse to human-caused warming is much less direct.

Reuters reported that experts studying satellite imagery could confirm that a substantial part of the glacier's lower section had collapsed, but that the precise reason for the collapse was still unclear.

That uncertainty should be preserved. At the same time, the broader climate evidence is strong.

ICIMOD reported in 2026 that glaciers across the Hindu Kush Himalaya have been losing ice at an accelerating rate, with the rate of ice loss since 2000 roughly twice that of the previous period.

Between 1990 and 2020, the region's glaciers lost about 12 percent of their total area and 9 percent of their estimated ice reserves.

A separate 2026 assessment based on 50 years of glacier observations found that about 89 percent of recorded years had a negative glacier mass balance.

In other words, most observed years showed more ice being lost than gained.

These changes matter because a glacier is not simply a reservoir of frozen water. Its retreat can change the structure of mountain slopes, the distribution of ice and water, and the stability of surrounding terrain.

A 2018 study in Nature Geoscience examined two extraordinary glacier collapses in western Tibet in 2016.

The researchers concluded that climate and weather conditions had contributed to the collapses by changing glacier dynamics, including conditions at the glacier bed.

They also stressed that unusual combinations of local glacier characteristics were required.

That research does not prove the same mechanism caused the 2026 disaster.

It does show that catastrophic glacier collapse is a real phenomenon in Tibet and that climate-related changes can contribute to glacier instability under particular conditions.

The broader flood record is also changing.

An analysis of 1,015 floods in High Mountain Asia found that flood frequency has increased since 2000 and that rising temperatures are an important driver.

The researchers also found that floods are becoming less predictable in their timing, with more events occurring outside the traditional monsoon period.

ICIMOD has warned that glacier retreat, permafrost thaw, erosion and changing water systems can increase the risk of landslides and glacial lake outburst floods.

Its regional assessments identify a growing hazard to communities and infrastructure in mountain valleys.

So there are two statements that can both be true.

Global warming is changing the Himalayan environment in ways that increase some forms of glacier and flood risk.

And scientists do not yet have enough evidence to say that global warming caused the particular glacier collapse that triggered the August 2026 flood.

A changing Himalayan hazard

The August disaster also occurred in a region where extreme events are already becoming a recurring problem.

ICIMOD researchers noted that the Lhende Khola river system had flooded twice within 14 months.

The previous event and the 2026 flood had different immediate characteristics, but the repeated disruption illustrates how quickly hazards can recur in steep Himalayan catchments.

The Himalayan landscape is also becoming more heavily used.

Roads, hydropower projects, border crossings, settlements and tourism infrastructure occupy river valleys that can appear safe under ordinary conditions.

When an extreme flood occurs, those same valleys become natural channels for water, rock and sediment.

This creates a difficult risk equation. A mountain event does not have to become more powerful to become more destructive.

More people and more infrastructure in exposed areas can increase the consequences of the same natural process.

The concentration of hydropower infrastructure along the affected rivers illustrates the problem.

Nepal has invested heavily in mountain hydropower, and many projects are located close to rivers because they depend on those rivers for water and elevation.

The August flood damaged both operating plants and projects still under construction.

The disaster therefore exposed several overlapping risks: unstable mountain terrain, retreating glaciers, powerful rivers, settlements in narrow valleys and infrastructure concentrated along river corridors.

The disaster is still unfolding

As of August 27, rescue teams were continuing to search for survivors.

Nepal had deployed thousands of security personnel, helicopters and rescue teams. Some communities remained isolated because roads and bridges had been destroyed.

Heavy sediment and unstable terrain were slowing operations.

China was carrying out its own search operation around Gyirong and had mobilized additional emergency personnel.

Authorities were also monitoring upstream conditions because another blockage or landslide could produce a secondary flood.

The final human and economic cost cannot yet be calculated.

Predicting a tropical cyclone means answering three difficult questions: Where will it go? How strong will it become? And how large will its dangerous winds be?

A new study published in Nature suggests that artificial intelligence (AI) can now answer all three questions with remarkable accuracy.

Researchers tested Google's WeatherNext Cyclones (WN-C) against leading forecasting systems and found that it produced more accurate forecasts of cyclone tracks, intensity and wind structure.

The researchers estimate that its improvements amount to about a day of additional useful forecast time.

WN-C was evaluated using historical cyclone data from 2023 and 2024, with additional testing in 2025.

The system has also been producing real-time forecasts through Google's Weather Lab since June 2025.

A different approach to cyclone forecasting

Cyclone forecasting has a long-standing problem.

Global weather models are good at predicting the large-scale atmospheric currents that steer storms.

They are less effective at representing the small-scale processes that control rapid changes in intensity.

Regional models such as NOAA's Hurricane Analysis and Forecast System, or HAFS, operate at higher resolution and are better suited to intensity forecasting.

Their geographic coverage is more limited, however.

Previous AI weather models have generally been much better at forecasting tracks than intensity.

WN-C was designed to address both problems.

The model is trained using global atmospheric analysis data from ECMWF and cyclone information from IBTrACS, a database containing details of nearly 5,000 observed tropical cyclones.

Those records include storm tracks, intensity and wind radii.

Rather than producing one forecast, WN-C generates an ensemble of possible futures. It can produce at least 50 forecasts and scale up to 1,000 members.

The system forecasts atmospheric conditions and cyclone characteristics for up to 15 days. That gives forecasters something a single forecast cannot provide: a picture of uncertainty.

A 230-kilometer error at five days

The strongest result concerns cyclone tracks.

At five days, the average WN-C track error was 230 kilometers. ECMWF's ENS ensemble had an error of 370 kilometers, while Google's GenCast AI model had an error of 335 kilometers.

WN-C therefore reduced the five-day error by 140 kilometers compared with ENS and by 105 kilometers compared with GenCast.

The researchers also translated that difference into forecast time.

ENS reached the same 230-kilometer error at about 3.75 days.

WN-C reached it at five days, giving it just over 30 hours of additional warning at that accuracy level. Its advantage over GenCast was about 24 hours.

The result was consistent across ocean basins and observed cyclones.

A separate probabilistic assessment found about a one-day advantage over ENS and a slightly smaller advantage over GenCast.

The model also showed good calibration.

Its spread-to-skill ratio was close to the ideal value of 1 for most forecast periods, meaning the amount of uncertainty represented by its ensemble was generally consistent with its actual errors.

During Hurricane Milton, the model's relatively tight ensemble spread correctly indicated high confidence in the eventual landfall location several days in advance.

Intensity is where the result gets interesting

Forecasting where a cyclone will travel has improved steadily. Predicting how quickly it will strengthen has been harder.

WN-C performed well against HAFS, a specialized high-resolution model designed for cyclone intensity and structure.

At three days, WN-C's mean intensity forecast was 3.75 knots more accurate than HAFS.

The AI system also had lower intensity errors across the tested forecast periods, with statistically significant improvements between 0.5 and 3.25 days.

The finding is notable because WN-C does not rely on the extremely high-resolution atmospheric data used by regional cyclone models.

The researchers say its results suggest that coarser global atmospheric data contain more information about cyclone intensity than previously thought.

WN-C also produced better probabilistic intensity forecasts.

Its Continuous Ranked Probability Score was reduced by more than 50 percent across many lead times compared with ENS and debiased GenCast.

Its calibration was substantially closer to the ideal than the competing probabilistic models.

The size of a cyclone matters too

A cyclone is not simply a dot moving across a weather map.

Two storms with the same maximum wind speed can affect very different areas. WN-C therefore forecasts wind radii at 34, 50 and 64 knots in four quadrants around the storm.

For 34-knot winds, WN-C produced significantly smaller extent errors than both ENS and HAFS.

The model can use its ensemble to calculate the probability that winds above those thresholds will affect a particular location during a forecast period.

That can give forecasters more information about the potential area of impact, rather than relying only on the projected center of the cyclone.

Rapid intensification remains difficult

There is one major warning against getting carried away with the results.

Rapid intensification remains one of the hardest problems in tropical cyclone forecasting.

In the study, it means an increase of at least 30 knots in maximum sustained winds within 24 hours.

No model performed exceptionally well at predicting these events.

WN-C was nevertheless competitive with, or better than, the other individual models across a range of probability thresholds.

Its Critical Success Index improved from below 0.3 to about 0.5 in the tested cases.

The researchers note that results at very high probability thresholds are less reliable because there were few events in that part of the sample.

That means WN-C has improved the odds of identifying rapid intensification. It has not solved the problem.

Why 1,000 forecasts can be better than 50

One of the advantages of AI is speed. WN-C can generate much larger ensembles than conventional systems.

The researchers found that increasing the ensemble from 50 to 1,000 members substantially improved its Relative Economic Value, particularly at longer forecast periods such as seven days.

It's something that matters because rare events are difficult to represent with a small sample.

A 1,000-member ensemble provides many more possible atmospheric futures, giving forecasters a better estimate of low-probability risks.

The model can also complement conventional forecasting systems rather than replace them.

The researchers found that WN-C's errors were relatively weakly correlated with those of existing numerical models.

When it was added to consensus forecasting systems, the combined forecasts became substantially more accurate.

That makes the AI system particularly interesting for operational forecasting. Its value may lie partly in making mistakes that are different from those made by conventional models.

A real-world test

WN-C has been running in real time since June 2025.

During the 2025 Atlantic hurricane season, its experimental forecasts were also supplied to the National Hurricane Center.

Hurricane Melissa provided a particularly striking example.

According to Google DeepMind, WeatherNext predicted that Melissa would reach Category 5 strength and make landfall in Jamaica five days ahead of the event, with 80 percent confidence.

That confidence rose to almost 100 percent three days before landfall.

The system was used alongside conventional numerical models, observations and other forecasting tools. It did not replace the official forecast issued by the National Hurricane Center.

That distinction remains important.

AI can provide another source of guidance, but cyclone warnings still depend on human forecasters assessing the full range of hazards and deciding what information should be communicated to the public.

The study's results nevertheless mark a significant step.

At the five-day point, WN-C's average track error was 230 kilometers compared with 370 kilometers for ENS. It was also 3.75 knots more accurate than HAFS at predicting intensity three days ahead.

For tropical cyclone forecasting, where an extra 24 or 30 hours can mean more time to prepare, those numbers are more than improvements on a chart.

They represent additional time in which people can make decisions before the storm arrives.

California's coastal cliffs are part of the state's identity.

They frame famous surf breaks, overlook busy beaches, and support roads, railways, campgrounds, homes, and public parks.

They also fail without much warning.

And that's a real serious issue, as every year, thousands of people walk beneath cliffs that are slowly changing shape under the combined force of waves, rain, gravity, and time.

For decades, geologists understood why cliffs collapse. Predicting exactly when one would fail was another matter.

Now, a new four-year research effort led by the Scripps Institution of Oceanography suggests that this may be changing.

Scientists found that buried ground sensors detected subtle movement in coastal cliffs hours to days before five separate collapses in San Diego County.

The findings raise the possibility that an early warning system for dangerous cliff failures could eventually become as practical as weather alerts or flood warnings, although researchers stress that more years of monitoring are still needed before such a system becomes operational.

But there's good news. Here's what we, as beach and seaside users, should know.

Why California's cliffs deserve attention

About 70 percent of California's shoreline consists of eroding coastal cliffs. That's actually quite an impactful figure.

They attract millions of visitors each year, yet they also support highways, rail corridors, military facilities, universities, businesses, wastewater infrastructure, and residential neighborhoods.

As sea level rises and coastal erosion continues, the risks to both people and infrastructure are expected to increase.

The danger, however, is not theoretical.

Since 1941, at least 25 people have died in coastal cliff collapses on California beaches.

San Diego County has recorded the highest number of fatal incidents, including the August 2019 tragedy at Grandview Beach in Encinitas, where a large section of cliff collapsed and killed three women enjoying a summer afternoon on the sand.

That event helped inspire California legislation that funded the Scripps research program.

Researchers also point to future infrastructure losses.

Previous studies estimate that by 2100, cliff retreat could affect roughly 10,000 coastal parcels, 14,000 residents, 240 miles (385 kilometers) of roads, and 10 miles (16 kilometers) of railway in central and northern California alone.

Southern California, where development is even denser, was not included in that estimate.

But California is not the only place where people die as a result of landslide events.

Spain, France, the United Kingdom, and Portugal are among the more than 30 countries where fatalities occurred in these types of incidents.

Looking underground instead of at the cliff face

Rather than relying only on visual inspections, the research team decided to measure what happens inside the ground before a collapse.

Scientists installed nearly 40 instruments at three high-risk locations in San Diego County: Beacon's Beach in Encinitas, the coastal railway corridor in Del Mar, and San Elijo State Beach.

The network included buried micro electro-mechanical system (MEMS) tiltmeters, highly sensitive electrolytic tiltmeters, extensometers, weather stations, optical displacement sensors, and other monitoring equipment.

The buried MEMS tiltmeters became the project's standout performers. These sensors are essentially extremely sensitive digital levels.

Modified by the research team and attached to one-meter-long rods buried beneath the surface, they could detect tiny changes in ground angle while filtering out temperature swings and other surface disturbances.

Each sensor transmitted data every 15 minutes through a wireless network.

Although more expensive instruments were also tested, the relatively inexpensive MEMS sensors consistently detected meaningful changes before failures occurred.

Five collapses that did not happen without warning

The study captured five separate cliff failures.

In every case, the sensors recorded accelerating ground deformation before collapse.

The warning period ranged from several hours to several days.

Visible cracks also appeared along the cliff tops before each failure, giving researchers another important clue about where to concentrate monitoring efforts.

The best documented example occurred in Del Mar during April 2024.

Researchers noticed a crack about 2.5 millimeters wide extending roughly 10 meters parallel to the cliff edge.

Over the following weeks, instruments measured the crack widening by approximately 0.4 millimeters per day, a movement too small for people to notice with the naked eye.

Several rainfall events occurred during the same period.

On April 19, the sensor data began accelerating at a rate that researchers considered consistent with imminent failure, prompting them to notify coastal managers.

Two days later, at around 5 a.m. on April 21, an estimated 200 tons of rock and soil fell onto the beach below. Fortunately, nobody was there.

The data showed something important: it was not simply that the cliff moved before failing.

The movement itself accelerated, following a pattern that has long been recognized in landslide mechanics. As stress builds within unstable rock or soil, deformation speeds up before the final collapse.

Detecting that acceleration appears to offer the most useful warning signal.

Not every cliff behaves the same way

The findings are promising, but the researchers avoid suggesting that cliff failures have become easy to predict.

One monitored event behaved differently.

The ground movement accelerated, then stabilized, then accelerated again several times before finally collapsing.

Had authorities acted on the first acceleration alone, it could have resulted in a false alarm.

That uncertainty is one reason the team says much larger datasets are needed before warning systems become routine.

Beacon's Beach presents another challenge.

Unlike the sudden upper cliff failures seen at Del Mar and San Elijo, Beacon's contains a deep rotational landslide that periodically reactivates along an older slip surface.

Permit delays meant that the project's highest resolution instruments were installed late in the study, leaving too little time to evaluate their performance before another major failure occurred.

Laser mapping revealed the bigger picture

Ground sensors provide highly localized information.

To understand how cliffs behave across an entire coastline, researchers also mapped approximately 12.5 miles (20 kilometers) of San Diego County coastline every week between 2022 and 2025.

Using truck-mounted lidar systems and drone photogrammetry, the team built detailed three-dimensional models of cliff faces extending from Torrey Pines State Beach to Encinitas.

Across roughly 2,500 miles (4,000 kilometers) of repeated surveys, scientists identified about 4,300 individual erosion events.

Most erosion occurred during winter, when rainfall was highest, although some failures still happened during dry summer months.

The researchers compared every event with rainfall records to estimate how the weather influenced the collapse probability.

The analysis showed that small cliff failures were common under almost any conditions. Larger failures behaved differently.

Large upper cliff collapses made up only 3.6 percent of the database and became much more likely after heavy rain.

According to the preliminary analysis, following a day with more than one inch of rainfall, there was about a 70 percent probability that at least one large cliff failure would occur somewhere within the study area during the following four weeks.

The researchers emphasize that these numbers are preliminary because they are based on only a few years of observations.

Turning science into public safety

Detecting an impending collapse is only part of the challenge.

The report notes that California currently lacks consistent statewide procedures describing what agencies should do when monitoring indicates that a cliff may soon fail.

Researchers recommend developing coordinated warning protocols involving emergency management offices, lifeguards, the California Geological Survey, the National Weather Service, transportation agencies, and local governments.

Possible responses could include temporary beach closures, restricting access to cliff tops, continuous monitoring, additional warning signs, or controlled rock removal where appropriate.

The researchers also argue that public education deserves equal attention.

Better warning signs, school programs, public service campaigns, and beach safety information could reduce injuries even before sophisticated prediction systems become widely available.

Their work has also produced practical tools beyond cliff monitoring.

One experimental smartphone-friendly application developed during the project forecasts beach width up to three days in advance at Torrey Pines State Beach, helping visitors understand when tides and waves leave little room to keep a safe distance from unstable cliffs.

The next step

The scientists are careful not to describe the project as a finished warning system.

Instead, they see it as proof that coastal cliffs often reveal measurable signs before they fail.

The challenge now is determining how reliable those signals remain across different rock types, weather conditions, and stretches of coastline.

The team recommends extending monitoring well beyond San Diego County to locations including Orange County, Palos Verdes, Santa Barbara, Big Sur, Santa Cruz, Pacifica, Sonoma County, Fort Bragg, and the Lost Coast.

They also propose establishing a long-term California Coastal Landslide Research Center to coordinate observations, maintain statewide datasets, and improve prediction models as additional years of measurements become available.

Will there be funding for such a relevant study?

Tsunamis are relatively rare and difficult to study due to their unpredictability.

When a magnitude 8.8 earthquake struck off Russia's Kamchatka Peninsula on July 29, 2025, it immediately became one of the largest earthquakes recorded since 1900.

The quake ruptured part of the Kuril Kamchatka subduction zone, where the Pacific Plate dives beneath the Okhotsk Plate, and generated a tsunami that crossed the Pacific Ocean.

Warnings were issued for Russia, Japan, Hawaii, Alaska, the U.S. West Coast, and several other Pacific regions.

Fortunately, the tsunami caused far less destruction than events such as the 2011 Tohoku disaster in Japan, but for oceanography and marine scientists, it opened an unexpected window into how giant tsunamis behave in the open ocean.

The timing could hardly have been better for science.

About 70 minutes after the earthquake, the Surface Water and Ocean Topography (SWOT) satellite flew over the expanding tsunami.

It was the first time a satellite captured a detailed, two-dimensional view of a major tsunami generated by a major subduction-zone earthquake.

Until then, researchers had mostly relied on deep ocean pressure sensors called DART (Deep-ocean Assessment and Reporting of Tsunamis) buoys, coastal tide gauges, and computer models to understand these events.

Those tools remain essential, but each measures only isolated points in the ocean.

SWOT offered something entirely different as it painted a broad picture of the sea surface as the tsunami raced across the Pacific.

Seeing the whole wave instead of a few dots

Oceanographers often compare DART buoys to weather stations.

They provide precise measurements where they are located, but they cannot show what is happening everywhere between them.

SWOT changed that.

Its radar instruments measured sea surface height across a swath roughly 93 miles (150 kilometers) wide with centimeter-level precision.

Instead of recording a single line of data, the satellite mapped the shape of the tsunami across a broad section of the ocean.

Scientists could watch how different parts of the wave evolved as they moved away from the earthquake.

That wider view quickly revealed something unexpected.

Researchers had long modeled the possibility that a large tsunami could produce complicated patterns in the open ocean, but direct observations had been scarce.

The Kamchatka tsunami showed waves scattering, bending, and interacting across the Pacific in ways that were far more intricate than many simplified descriptions suggest.

Rather than behaving like one clean wavefront, the tsunami developed smaller wave trains and complex structures that traditional observing systems could not fully capture.

Lead author Angel Ruiz Angulo of the University of Iceland said the satellite provided a perspective scientists simply had not had before.

The broader view helped confirm that some features predicted by advanced numerical models are real and measurable in the ocean itself.

A clearer picture of what happened beneath the seafloor

The satellite observations did more than improve the view of the tsunami. They also helped scientists reconstruct the earthquake itself, something that, for instance, was not possible in 1958, the year the largest ever wave was recorded in Lituya Bay, Alaska.

Researchers combined SWOT measurements with data from three nearby DART buoys to estimate how the seafloor moved during the rupture.

Their analysis suggested that the rupture extended for roughly 250 miles (400 kilometers) along the fault and produced about 11 feet (four meters) of maximum uplift in the tsunami source region.

Those estimates differed in important ways from published seismic fault models that relied mainly on earthquake and geodetic data.

Neither approach alone fully explained all the observations. So, the solution was to blend the two.

The researchers combined uplift estimated from the tsunami data with subsidence from the seismic and geodetic models.

The hybrid source matched both the satellite observations and the buoy records more closely than either model by itself.

That result showed how ocean observations can directly improve our understanding of earthquakes occurring beneath the sea.

Why this matters for tsunami forecasts

Modern tsunami warning centers already produce forecasts within minutes after large earthquakes by combining seismic information with computer simulations and measurements from DART buoys.

Those systems have saved lives around the world.

The Kamchatka event suggests that future forecasts could become even more accurate as satellites like SWOT contribute additional observations.

The satellite data help scientists test and refine the physical models that describe how tsunami waves spread across entire ocean basins.

Better models should improve forecasts of wave arrival times, wave heights, and local coastal hazards during future events.

NASA scientists have described the observations as an important step toward validating tsunami forecast models with real-world measurements over large areas instead of isolated locations.

That gives researchers greater confidence when they use those models to guide emergency planning and warning systems.

Oceanography enters a new era

The Kamchatka earthquake demonstrated that satellites designed primarily to study water can also become powerful tools for studying some of Earth's largest natural disasters.

For decades, oceanographers have pieced together tsunami behavior using scattered measurements across vast distances.

The 2025 event showed that wide swath satellite altimetry can fill many of those gaps.

Instead of inferring the shape of a tsunami from a handful of instruments, scientists can now observe large sections of the wave directly as it travels through the open ocean.

The earthquake itself was tragic and powerful, but for ocean science, it marked the beginning of a new observational capability.

Researchers can now compare satellite measurements, buoy observations, seismic records, and numerical models in ways that were impossible before July 2025.

That combination promises a better understanding of both the earthquakes that disturb the seafloor and the ocean waves they send racing across the world's largest basin.

Words by Luís MP | Founder of SurferToday.com

For years, the Ocean Observatories Initiative (OOI) has quietly done one of the hardest jobs in science. And that is to watch the ocean.

The project was built as a network of more than 900 instruments and buoys that track ocean circulation, marine ecosystems, ocean chemistry, climate trends, extreme weather conditions, and seismic activity.

The system operates in some of the most remote and hostile environments on Earth, gathering information around the clock and sending it back to researchers in real time.

Now, that network is being largely dismantled.

In late May, the National Science Foundation (NSF) announced that it would begin a major downsizing of the OOI Major Facility.

Over roughly 15 months, instruments deployed off Oregon, Washington, Alaska, North Carolina, and southeast Greenland will be removed from the water.

The decision ends a project that many scientists expected to continue operating for another couple of decades.

The move has triggered concern throughout the ocean science community.

Researchers say the United States is stepping away from a rare long-term observing system at a time when the oceans are experiencing rapid and poorly understood changes.

What the OOI was built to do

The OOI became fully operational in 2015 and 2016 after more than a decade of planning, engineering, and construction.

The system cost roughly $368 million to $370 million to build and required about $48 million each year to operate.

Around 60 to 70 people worked directly on the project across participating institutions.

Its design reflected a simple scientific reality. Detecting meaningful climate trends often requires decades of uninterrupted observations.

For that reason, the OOI was designed as a project expected to operate for 25 to 30 years.

The network combined moorings fixed to the seafloor, autonomous underwater gliders, robotic systems, and highly specialized sensors capable of surviving crushing pressure, corrosive seawater, and the challenges of life in the deep ocean.

Jim Edson, a marine meteorologist who helped lead the initiative, described it as "the world's most advanced continuously operating ocean observing systems."

The information collected by the network has supported more than 500 scientific publications and has become a valuable public resource for researchers around the world.

The decision to remove the network

The National Science Foundation says the descoping effort fits within a broader strategy to manage its research infrastructure portfolio and redirect resources toward evolving priorities and emerging technologies.

Michael England, head of media affairs at the agency, told reporters that the decision aligns with a "nimbler approach" to scientific priorities and lifecycle management.

The announcement arrived as the Trump administration proposed deep reductions to federal science spending.

The administration's proposed 2026 budget included a 55 percent cut to the National Science Foundation.

According to reporting on the decision, the administration had previously sought reductions of up to 80 percent in funding connected to the initiative.

Congress restored funding on those occasions, but the descoping process moved forward.

Critics have also pointed to Project 2025, a policy blueprint produced by the Heritage Foundation.

The document specifically identified the OOI as a target for elimination and argued that climate research associated with the program should be disbanded.

The White House has not publicly tied the descoping decision to Project 2025, but the overlap has intensified political debate around the future of federal climate science.

What is being lost

The instruments scheduled for removal are spread across several strategically important regions.

Off the Pacific Northwest, the Coastal Endurance Array has provided continuous observations of temperature, oxygen levels, acidity, and other conditions that affect marine ecosystems and commercial fisheries.

In the Gulf of Alaska, Ocean Station Papa has helped scientists monitor ocean acidification and broader changes in ocean health.

In the North Atlantic, moorings in the Irminger Sea, located between Greenland and Iceland, have supplied critical information about the Atlantic Meridional Overturning Circulation, or AMOC.

The vast system of ocean currents plays a major role in regulating the climate.

The Irminger Sea instruments are attached to the seafloor roughly 9,200 feet (about 2,800 meters) below the surface, and form part of an international scientific effort to understand changes in the circulation system.

Scientists worry that weakening of the AMOC could have far-reaching consequences.

Research has linked a potential slowdown or collapse to major disruptions in weather patterns, sea level rise along parts of the United States East Coast, colder winters in Europe, and drought in some regions of Africa.

"Ongoing monitoring of the ocean is critical, especially now," said Stefan Rahmstorf, a professor at Potsdam University who studies the circulation system.

Why satellites cannot replace it

Many of the measurements collected by the OOI cannot be gathered from space.

Satellites are useful for observing conditions at the ocean surface. They can track temperature patterns, sea level changes, and chlorophyll concentrations.

What they cannot do is continuously measure conditions deep below the surface.

That includes oxygen levels, chemical changes, deep water circulation, and other processes that often provide the earliest signs of environmental shifts.

Researchers say this is particularly important because some of the most significant oceanographic signals develop well beneath the surface, out of view of satellites and traditional monitoring systems.

Ed Dever, an Oregon State University professor who helped lead Pacific Northwest operations, described the loss bluntly.

"It's a crippling loss of information," he said.

Impacts on fisheries, weather, and coastal communities

The consequences of the descoping effort extend beyond academic research.

Data collected by OOI instruments helps scientists and resource managers understand marine heat waves, ocean acidification, coastal flooding, and changing fish populations.

Along the Pacific Northwest coast, information from the Endurance Array supports fishing communities and tribal nations.

Jan Newton, an oceanography professor at the University of Washington, said the system helps members of the Quinault Indian Nation assess conditions affecting Dungeness crab populations.

The same network contributes to weather observations used by vessels operating in regional waters.

Scientists warn that removing instruments will reduce the amount of information available to mariners and fisheries managers.

On the East Coast, lawmakers argue that the data supports communities affected by changing coastal currents and flooding risks.

"For our watermen and farmers and our coastal community residents and businesses, changes in currents and flooding have a major impact on their lives and livelihoods," Senator Chris Van Hollen of Maryland said.

A time of rapid ocean change

The decision arrives during a period of unusual stress for the global ocean. Sea surface temperatures have reached record levels in many regions.

Scientists are monitoring the development of a powerful El Niño event in the Pacific. Marine heat waves are affecting ecosystems and fisheries. Coral reefs around the world are experiencing severe bleaching events.

At the same time, researchers are trying to understand whether major ocean circulation systems are entering a period of significant change.

Helen Findlay, a biological oceanographer at Plymouth Marine Laboratory, said sustained observations are essential because they reveal risks as they emerge.

"Without them, we are effectively choosing to navigate an increasingly volatile ocean with diminishing visibility," she said.

Findlay's research on ocean acidification has suggested that large parts of the ocean have already entered what she calls a "zone of risk" for ecosystem change.

Scientists argue that long records are especially valuable during periods of rapid environmental change because they allow researchers to separate short-term fluctuations from genuine long-term trends.

The cost question

Supporters of the descoping effort point to annual operating expenses of about $48 million.

Critics respond that the nation has already invested nearly $370 million in building the infrastructure and training the specialists required to operate it.

Rick Spinrad, the former administrator of the National Oceanic and Atmospheric Administration (NOAA), questioned whether shutting down the system would truly save money in the long run.

"I'd call this penny wise, tons foolish," he said.

Others emphasize that expertise is also at risk.

Helen Palevsky of Boston College noted that collecting data in places such as the Irminger Sea required years of engineering experience and operational knowledge.

"One of the real tragedies here is that collecting data effectively at this site was a huge engineering challenge," she said, warning that specialized knowledge could disappear along with the infrastructure.

Craig McLean, who served as NOAA's chief scientist during Trump's first administration, argued that the decision weakens the country's position in global science.

"By dismantling such a system, we push the United States back yet again into a rear seat in global scientific leadership," he said.

What will remain

Not every part of the initiative is disappearing.

The Regional Cabled Array off the Pacific Northwest coast, managed by the University of Washington, is expected to continue operating.

The seafloor cable network provides information about volcanic activity, earthquakes, and related geologic processes beneath the ocean.

Even so, researchers note that the removal of most in-water observing infrastructure will dramatically reduce the breadth of environmental measurements that the broader OOI network was designed to collect.

For many scientists, the deepest concern is not what has been learned during the initiative's first decade but that the data that will never be collected during the decades that were supposed to follow.

"We've just got to the 10-year record," Ed Dever said. "Which will give you some hints, but it won't continue on."

On Portuguese beaches, an unexpected dispute has triggered a broad discussion about public beach access.

A family arrives early, plants a beach umbrella in the sand, and within minutes is told to move because the spot is "in front of the concession."

For years, many Portuguese beachgoers accepted the rule as if it were law.

Signs on beaches in the Algarve and elsewhere directed people carrying their own parasols toward specific sections of the sand, often away from rows of rented loungers and parasols operated by private concessionaires.

Then, suddenly, the country's environmental authority said the practice had no legal basis.

"It is an abuse," said José Pimenta Machado, president of the Portuguese Environment Agency (APA), during a visit to Praia do Garrão in Loulé on May 25.

"The only area that is concessioned is the rectangle that is delimited. Everything else is free use."

The statement ignited a national debate that quickly became larger than umbrellas and loungers.

At stake is an old question that many coastal countries are struggling with: who truly owns the beach?

SurferToday.com has been dissecting the topic of public beach access for nearly two decades.

The legal gray area on Portuguese beaches

Portuguese beaches are part of the public maritime domain under national law.

The Constitution of Portugal and the country's water legislation establish that coastal areas are public property intended for collective use.

Private operators can obtain concessions to run beach services, though.

They rent parasols and loungers, maintain support facilities, provide bathrooms, and often finance lifeguard operations.

But the concession does not transfer ownership of the beach itself. The confusion comes from how those concessions are organized on the sand.

Under Portuguese beach planning rules, concession areas must be physically delimited.

APA officials have repeatedly said that only the marked concession zone is reserved for commercial use.

Outside those limits, beachgoers are free to place their own parasols.

The agency also reminded operators that concession structures are generally limited to one-third of the beach area.

APA has reportedly warned some operators for exceeding authorized occupation zones or placing equipment too close to unstable cliffs.

Still, many Portuguese beaches developed informal practices over the years that went far beyond the written law.

In several Algarve beaches, signs instructed visitors not to place umbrellas directly in front of concession areas, even when those spaces remained part of the public sand.

Beach concessionaires insist they were following official guidance.

"The truth is that it seems there was never a law," André Sousa, a concessionaire at Praia do Garrão, told reporters.

"But the beach notices always said it was mandatory to comply with the existing signage."

Sousa rejected accusations of abusive behavior. He argued that operators merely followed rules approved by maritime authorities and local beach regulations.

"We never forced anyone to leave," he said. "We recommended where people should place their umbrellas."

Other concessionaires framed the issue as one of safety and organization.

João Carreira, another beach operator quoted in Portuguese media, said concession areas were designed to maintain circulation corridors, visibility for lifeguards, and access to emergency routes.

He argued that placing personal parasols directly beside rented loungers creates disorder and reduces the attractiveness of the paid service.

"There has to be common sense," he said.

The public pushback

For many beachgoers, the APA's comments confirmed a suspicion that had existed for years: parts of the Portuguese coast were slowly becoming semi-private through custom rather than law.

The debate exploded online after national television channels and newspapers reported the APA's position.

Videos of beach signs spread across social media.

Many users described being pressured by lifeguards or concession staff to move away from areas near rented parasols, especially during the crowded summer season in the Algarve.

Environment Minister Maria da Graça Carvalho sided publicly with the APA.

"The beaches are public. They always were and continue to be," she said.

APA announced that it would issue formal written guidance to municipalities, maritime authorities, and concessionaires to eliminate contradictory interpretations.

The agency also indicated that signage restricting the placement of personal umbrellas outside concession boundaries would be reviewed.

The issue resonates strongly in Portugal because beach access is woven into daily life and national identity.

The country has nearly 590 miles (950 kilometers) of Atlantic coastline and more than 600 official bathing beaches.

In 2025, Portugal welcomed an all-time high of 32.5 million guests in tourist accommodations, a 3 percent increase from 2024. Of these, 19.7 million were international tourists.

During the summer months, many urban beaches become crowded public spaces where economic differences blur under towels and parasols.

That social dimension explains why the dispute spread so quickly beyond local beach politics.

A global fight over public shores

Portugal is not alone in confronting these tensions.

Around the world, coastlines have become battlegrounds between public access and private interests, particularly as beachfront property values rise and tourism intensifies.

One of the best-known examples unfolded in California around Martins Beach, south of San Francisco.

The beach became internationally famous after billionaire investor Vinod Khosla purchased the surrounding property in 2008 for $32.5 million and later restricted public access through the only road leading to the shore.

California law guarantees public access to beaches up to the mean high tide line.

For decades, local families, surfers, and fishermen had used Martins Beach freely, paying only small parking fees to previous owners.

After Khosla closed the access gate in 2010 and installed "No Trespassing" signs, environmental groups and state agencies launched years of lawsuits.

"This case goes to the heart of California's public access mandate," Steve Padilla, chair of the California Coastal Commission, said during one stage of the legal battle.

The Surfrider Foundation, which fought the case in court, described the dispute as one of the most important public-access fights in the United States.

Courts repeatedly ruled that access had to be restored.

A similar conflict emerged in Florida in recent years after some wealthy beachfront property owners attempted to limit public use of dry-sand areas adjacent to their homes.

Beach tags in the New Jersey coastline have also generated controversy.

In Hawaii, shoreline access battles frequently pit luxury development projects against long-standing customary access rights.

The disputes share the same underlying pressure.

Beaches are public by tradition and law in many countries, but the economic value of coastal land continues to rise.

Portugal's controversy may appear modest compared with billion-dollar legal wars in California. Nobody is locking gates on the Algarve coastline.

Yet the emotional reaction reveals how sensitive the subject has become.

For many people, a line of rented parasols is a sign that public space is slowly shrinking as informal restrictions become accepted as normal behavior.

The economics of shade

Concessionaires argue that the debate often ignores the financial reality of operating beaches.

Portuguese beach operators pay concession fees and are responsible for infrastructure, cleaning, safety support, and maintenance. Many say they depend heavily on summer rentals to survive economically.

In some beaches, the most desirable front-row areas near the sea are precisely the spaces where private umbrellas create direct competition with paid parasols.

André Sousa acknowledged that unrestricted placement of personal parasols could hurt business.

"Probably yes," he said when asked whether it could have economic consequences.

"A customer paying for a lounger and umbrella may not find it attractive if someone puts a private umbrella directly in front."

The Portuguese government has historically encouraged private concessions to maintain beach services without placing all costs on municipalities or the state.

That balance between commercial operation and public access now sits at the center of the controversy.

APA's intervention suggests the government wants to draw a clearer legal boundary before the summer season intensifies.

The agency's message is simple: concessionaires may operate within their licensed areas, but they cannot control the surrounding public sand.

Whether that clarification changes daily practice on crowded beaches remains uncertain.

Meanwhile, during Portuguese summers, families will probably still compete for shade and sea views with legal arguments attached.

Scientists and weather agencies are increasingly warning that the Pacific Ocean may be heading toward a very strong El Niño event in late 2026.

Some forecasts now place the odds of a major El Niño close to certainty by the end of the year.

Nevertheless, experts still debate whether the event will reach the unofficial "super" category used for the strongest episodes on record.

That distinction matters because the largest El Niño events have a habit of rearranging life on Earth for months at a time.

They can push global temperatures higher, flood some countries, dry out others, disrupt crops, spread disease, and strain power grids already stretched by heat.

El Niño is not a storm.

It is a large warming of surface waters in the central and eastern Pacific Ocean that changes wind patterns and shifts the atmosphere itself.

The World Meteorological Organization (WMO) and National Oceanic and Atmospheric Administration (NOAA) describe it as one of the most powerful drivers of year-to-year climate variability on the planet.

The phenomenon returns every two to seven years and often lasts close to a year. During strong events, the Pacific behaves like a giant heat engine.

Rain belts move, jet streams wander, fisheries suffer, and wildfire risk climbs in some regions while floodwaters rise in others.

The 1997 to 1998 El Niño and the 2015 to 2016 event became global reference points because of their economic and human toll.

Peru faced deadly floods and landslides, and Indonesia endured severe drought and fires.

Coral reefs around the world bleached under unusually warm oceans, and global temperatures surged.

Now, with oceans already unusually warm because of long-term climate change, oceanographers and meteorologists are watching the Pacific closely.

The WMO warned after the 2023 to 2024 event that El Niño and human-driven warming together helped produce record global temperatures and extreme weather.

The Food and Agriculture Organization (FAO) of the United Nations (UN) has also cautioned that El Niño can sharply increase risks to food security by damaging crops, livestock, fisheries, water supplies, and infrastructure.

A future super El Niño would not strike every region in the same way. It rarely does.

Floods, droughts, and a planet running hotter

In parts of South America, especially Peru and Ecuador, El Niño years are often associated with intense rainfall, flash floods, and destructive mudslides.

Coastal communities can see roads collapse, drinking water systems fail, and neighborhoods buried under debris.

In Southeast Asia and Australia, the opposite problem often emerges. Rainfall can weaken sharply, crops dry out, reservoirs shrink, and wildfires spread more easily through forests and peatlands.

Southern Africa, India, and portions of Central America have also experienced drought during past El Niño events.

The damage can unfold slowly.

A failed rainy season may not become a humanitarian emergency until months later, when food prices rise, and water supplies deteriorate.

The World Health Organization (WHO) says El Niño can also alter the spread of infectious diseases by changing rainfall, humidity, and temperature.

Flooding can contaminate drinking water and increase outbreaks of waterborne disease. Warmer and wetter conditions can also affect mosquitoes that carry illnesses such as dengue fever and malaria.

The heat itself may become one of the largest dangers.

Global temperatures typically rise during El Niño years because heat stored in the Pacific Ocean is released into the atmosphere.

Scientists already expect 2026 and 2027 to rank among the warmest years ever measured if a strong event develops.

That has consequences for cities.

Extreme heat pushes up electricity demand as millions of air conditioners switch on at once.

Roads can buckle, rail systems can warp, and hospitals face surges in heat-related illness, especially among older adults and outdoor workers.

In neighborhoods with limited tree cover, temperatures can remain dangerously high long after sunset.

Insurance companies are also paying attention.

Severe flooding, storms, and wildfire losses linked to climate extremes have already driven up insurance costs in many countries.

A major El Niño could deepen pressure on property markets in high-risk regions.

What happens to homes and infrastructure

A super El Niño does not damage property through one single mechanism. It creates chains of stress.

Heavy rainfall can overwhelm drainage systems that were built for older climate patterns.

Rivers rise faster, sewage systems back up, and landslides destabilize hillsides where homes and roads were never designed to handle prolonged saturation.

Coastal infrastructure may face a double burden if El Niño-driven storms combine with higher sea levels linked to climate change.

Ports, bridges, airports, and power systems become more vulnerable when extreme rainfall arrives on top of already elevated ocean conditions.

Agriculture often becomes an early casualty.

The FAO warns that farmers, fishers, and rural communities are usually among the first groups hit by El Niño-related weather shocks.

Drought can reduce harvests of rice, maize, wheat, and coffee.

Fisheries can decline when warm Pacific waters disrupt marine ecosystems and nutrient flows.

Food prices can then ripple outward into cities and international markets.

The economic damage from past strong El Niño events has reached tens of billions of dollars globally.

Researchers argue that the financial effects linger for years because damaged infrastructure, reduced productivity, and food shortages continue well after the weather pattern fades.

How families can prepare before conditions worsen

Preparation for El Niño is rarely dramatic - it is mostly practical.

People living in flood-prone areas can start by checking whether their homes are adequately insured against flooding and storm damage.

Many property owners discover too late that standard policies do not cover certain water-related losses.

Drainage matters more than many people realize.

Clearing gutters, storm drains, and nearby water channels can reduce localized flooding around homes. In regions exposed to landslides, retaining walls and slope stabilization can lower risk.

Heat preparation is equally important.

Families should identify cooling centers, backup water supplies, and ways to protect vulnerable relatives during heat waves.

Cities across Europe learned during recent extreme summers that isolation and poor ventilation can become deadly.

Emergency kits should include more than flashlights and batteries.

During prolonged heat or flood events, medications, water purification supplies, portable chargers, and copies of critical documents become essential.

Public health experts also encourage people to pay attention to official forecasts weeks in advance.

One advantage of El Niño is that it develops slowly enough to provide warning time. Unlike earthquakes or tornadoes, its broad impacts can often be anticipated months ahead.

The role of local governments

Municipal governments sit at the front line of climate disasters, whether they are prepared or not.

Cities can reduce flood losses by cleaning drainage networks before heavy rains arrive and by identifying neighborhoods at the highest risk.

Temporary flood barriers, expanded emergency shelters, and improved evacuation plans can save lives even when budgets are limited.

Heat action plans have become increasingly important.

These plans often include opening public cooling centers, extending pool hours, distributing water, and conducting welfare checks on elderly residents.

Urban design also shapes vulnerability.

Planting trees, expanding shaded public spaces, and using reflective building materials can reduce dangerous urban heat.

Some cities are redesigning streets and parking areas with more permeable surfaces so heavy rainfall can soak into the ground instead of overwhelming drains.

Public communication may be one of the cheapest and most effective tools available.

Confusing alerts cost time during emergencies.

Clear warnings, translated into multiple languages and distributed across radio, television, text messaging, and social media, help residents act early instead of waiting until roads are underwater.

What national governments can do

The most successful responses to El Niño often begin before the worst weather appears.

Weather forecasting systems remain one of the strongest defenses. The WMO has repeatedly emphasized that early warning systems save lives and livelihoods.

Governments that invest in forecasting, satellite monitoring, and emergency communication usually respond faster and more effectively.

Water management becomes critical during strong El Niño periods.

Countries vulnerable to drought can expand water storage, repair leaking infrastructure, and encourage conservation before shortages become severe.

Regions exposed to flooding may need to release reservoir pressure gradually and reinforce dams before intense rainfall begins.

Agriculture ministries can also act early by distributing drought-resistant seeds, adjusting planting calendars, and supporting farmers with crop insurance or emergency financing.

Health systems need preparation as well.

Hospitals may require backup electricity, expanded cooling capacity, and additional supplies for respiratory illness, heat stress, and waterborne disease outbreaks.

Mosquito control programs often intensify before and during El Niño periods because warmer and wetter conditions can expand breeding grounds.

Some governments are now treating climate forecasting as an economic planning tool rather than only a weather issue.

Energy markets, transportation systems, food reserves, and insurance regulators increasingly rely on seasonal climate projections to anticipate shocks.

The forecasting challenge

Scientists are confident that El Niño conditions are likely to develop during 2026. The discussion is about intensity.

The phrase "super El Niño" has no formal scientific definition used by every forecasting agency, but it is commonly applied to exceptionally strong events with very high Pacific Ocean temperature anomalies.

Forecasts have become more sophisticated in recent years because satellites, ocean buoys, and computer models now track subsurface ocean heat in greater detail.

Scientists are also studying how climate change may influence the strength and behavior of future El Niño events.

Still, uncertainty remains. No forecast can predict every regional impact months in advance.

Some areas may avoid major disruption, while others face severe extremes.

Scientists stress that El Niño changes probabilities, not certainties. That is why preparation matters.

The strongest El Niño events tend to expose weaknesses that already exist. Fragile infrastructure fails faster; poor drainage floods first.

Communities with weak healthcare systems struggle longer, and households without savings recover more slowly.

A super El Niño would not arrive as a single cinematic disaster. It would appear through many separate events unfolding across the globe at the same time.

A heat wave in one country, flooded streets in another, and crop losses somewhere else.

The Pacific Ocean may be warming thousands of miles away, but history suggests its consequences rarely stay there for long.

If you live in a coastal area, you may have wondered why your place seems much windier than neighboring regions. The truth is, there are several reasons for that to happen.

Stand on a blustery stretch of coastline and then drive a short distance inland, and the change can feel almost theatrical, as though someone has turned down an invisible dial.

It could be God or Nature, you decide. But the reason why it occurs has been scientifically dissected by us, mere mortals.

So, the contrast, while familiar to anyone who has spent time near the ocean, is rooted in a layered set of physical processes that begin with something deceptively simple: the uneven way in which Earth's surface absorbs and releases heat.

In other words, if Earth were covered by either a flat, water-only ocean or a flat terrain without water, wind speeds would be identical in any part of the globe.

Yes, you've read it well.

Let's see. Water and land behave very differently under the Sun.

The ocean, with its depth and capacity to mix, warms and cools slowly, while land surfaces heat up quickly during the day and shed that heat just as quickly at night.

The mismatch sets the stage for a daily atmospheric imbalance.

As the land warms, the air above it becomes buoyant and rises, leaving behind a subtle region of lower pressure. Think of a hot-air balloon.

Over the adjacent sea, where temperatures remain comparatively stable, the air is denser and the pressure slightly higher.

Nature dislikes imbalance, and so air begins to move horizontally, from the higher-pressure zone over the water toward the lower-pressure zone over land.

That movement is wind, and along the coast it is not an occasional visitor but a recurring feature, cycling in step with the Sun.

Surface friction: Why wind weakens inland

But the story does not end with the creation of wind - it extends into how that wind is sustained and how far it can travel.

Over the ocean, air moves across a relatively smooth surface. There are no forests, no buildings, no abrupt obstacles to break its momentum.

In physical terms, the surface roughness is low, which means there is less friction to slow the air down.

As a result, winds over the sea can maintain higher speeds and greater coherence over long distances, gathering strength from large-scale atmospheric patterns that span hundreds or even thousands of kilometers.

By the time this moving air reaches the shoreline, it often carries with it the accumulated energy of that journey.

Coastal areas, exposed directly to this incoming flow, experience the wind in its more intact and vigorous form.

Move inland, however, and the atmosphere encounters resistance.

The ground is no longer smooth but textured with vegetation, buildings, and terrain that disrupt the flow.

Each tree canopy, each ridge or cluster of houses, acts like a tiny brake, extracting energy from the moving air and converting it into turbulence - swirls and eddies that scatter the wind's momentum in different directions.

The process, known as frictional drag, rapidly reduces wind speed near the surface. Even if the air above remains in motion, what is felt at ground level becomes weaker and less consistent.

The transformation can happen over surprisingly short distances; a few kilometers can be enough for a steady coastal wind to degrade into intermittent gusts.

Topography and the Venturi (funneling) effect

Geography often amplifies this contrast in ways that are less obvious but equally important.

Coastlines are rarely straight, and their irregularities - headlands, bays, cliffs - can channel and accelerate airflow much like a nozzle increases the speed of water from a hose.

When wind is forced through a narrower space or area, it speeds up. It's a phenomenon described by physicists as the Venturi effect.

Certain coastal locations become known for their persistent gales not just because of their position by the sea, but because their shape concentrates the wind.

Inland regions, by contrast, tend to disperse airflow across a broader, more obstructed landscape, allowing it to lose intensity rather than gain it.

Exposure to large-scale marine winds

There is also a broader atmospheric context to consider, one that extends beyond the daily swings of sea breezes.

The world's prevailing winds - those large-scale air currents and movements driven by the rotation of the Earth and the uneven heating between equator and poles - often travel long distances over open water before making landfall.

Over the ocean, they encounter little to impede them, but once they cross the shoreline, they begin to decay under the influence of friction and topography.

In this sense, the coast acts as a kind of receiving edge for atmospheric energy, while the interior behaves more like a dissipative field, gradually absorbing and weakening that energy.

Boundary layer and atmospheric structure

Even the vertical structure of the atmosphere plays a role.

The lowest layer, known as the boundary layer, is where the atmosphere directly interacts with the surface.

Over water, this layer tends to be smoother and more stable, allowing winds to remain relatively strong even close to the surface.

Over land, it becomes more turbulent, especially during the day when heating from below causes rising thermals and chaotic mixing.

The turbulence redistributes energy vertically but also saps the organized horizontal motion that we perceive as steady wind.

Words by Luís MP | Founder of SurferToday.com