Climate Change
Explainer: How El Nino is helping drive heatwaves and extreme weather
Countries around the world from China to the United States are battling heatwaves, with the onset of the climate phenomenon El Nino helping push temperatures higher.
Scientists told Reuters that climate change and El Nino are the major drivers of extreme heat that have seen temperature records broken in Beijing and Rome, while leaving some 80 million Americans under excessive heat warnings.
El Nino is a natural phenomenon that in addition to contributing to higher temperatures in many parts of the world, also drives tropical cyclones in the Pacific and boosts rainfall and flood risk in parts of the Americas, Asia and elsewhere.
In June, the U.S. National Oceanic and Atmospheric Administration (NOAA) declared that an El Nino is now under way. The past three years have been dominated by the cooler La Nina pattern.
Scientists have warned that this year looks particularly worrying. The last time a strong El Nino was in full swing, in 2016, the world saw its hottest year on record. Meteorologists expect that this El Nino, coupled with excess warming from climate change, will see the world grapple with record-high temperatures.
Experts are also concerned about what is going on in the ocean. An El Nino means that waters in the Eastern Pacific are warmer than usual. Globally, sea temperatures hit new records for the months of May and June, according to the European Union’s Copernicus Climate Change Service. That could supercharge extreme weather, Reuters reported.
“We’re in unprecedented territory,” said Michelle L’Heureux, a meteorologist with NOAA’s Climate Prediction Center.
This year’s El Nino could lead to global economic losses of $3 trillion, according to a study published last month in the journal Science, shrinking GDP as extreme weather decimates agricultural production, manufacturing, and helps spread disease.
Governments in vulnerable countries are taking note. Peru has set aside $1.06 billion to deal with El Nino’s impacts and climate change, while the Philippines — at risk from cyclones — has formed a special government team to handle the predicted fallout.
WHAT CAUSES AN EL NINO?
El Nino is a natural climate pattern borne out of unusually warm waters in the eastern Pacific.
It forms when the trade winds blowing east-to-west along the equatorial Pacific slow down or reverse as air pressure changes, although scientists are not entirely sure what kicks off the cycle.
Because the trade winds affect the sun-warmed surface waters, a weakening causes these warm western Pacific waters to slosh back into the colder central and eastern Pacific basins.
During the 2015-16 El Nino — the strongest such event on record — anchovy stocks off the coast of Peru crashed amid this warm water incursion. And nearly a third of the corals on Australia’s Great Barrier Reef died. In too-warm waters corals will expel living algae, causing them to calcify and turn white.
This build-up of warm water in the eastern Pacific also transfers heat high into the atmosphere through convection, generating thunderstorms.
“When El Nino moves that warm water, it moves where thunderstorms happen,” said NOAA meteorologist Tom DiLiberto. “That’s the first atmospheric domino to fall.”
HOW DOES EL NINO AFFECT THE WORLD’S WEATHER?
This shift in storm activity affects the current of fast-flowing air that moves weather around the world — called the subtropical jet stream — pushing its path southward and straightening it out into a flatter stream that delivers similar weather along the same latitudes.
“If you’re changing where the storm highway goes … you’re changing what kind of weather we would expect to see,” DiLiberto said.
During an El Nino, the southern United States experiences cooler and wetter weather, while parts of the U.S. West and Canada are warmer and drier.
Hurricane activity falters as the storms fail to form in the Atlantic due to changes in the wind, sparing the United States. But tropical cyclones in the Pacific get a boost, with storms often spinning toward vulnerable islands.
Some parts of Central and South America experience heavy rainfall, although the Amazon rainforest tends to suffer from drier conditions.
And Australia endures extreme heat, drought and bushfires.
El Nino could offer a reprieve to the Horn of Africa, which recently suffered five consecutive failed rainy seasons. El Nino brings more rain to the Horn, unlike the triple-dip La Nina, which desiccated the region.
Historically, both El Nino and La Nina have occurred about every two to seven years on average, with El Nino lasting 9 to 12 months. La Nina, which takes hold when waters are cooler in the Eastern Pacific, can last one to three years.
IS CLIMATE CHANGE AFFECTING EL NINO?
How climate change might be affecting El Nino is “a very big research question,” said DiLiberto. While climate change is doubling down on the impacts from El Nino — layering heat on top of heat, or excess rainfall on top of excess rainfall — it’s less clear if climate change is influencing the phenomenon itself.
Scientists are not sure whether climate change will shift the balance between El Nino and La Nina, making one pattern more or less frequent. If ocean temperatures are rising across the board, it is unlikely the cycle would change, scientists said, as the basic mechanics behind the phenomenon stay the same.
However, if some parts of the ocean are warming faster than others, that could influence how El Nino plays out by amplifying temperature differences.
Climate Change
El Niño likely to intensify, may become strongest ever recorded, WMO says
A very strong El Niño can significantly shift rainfall and temperature patterns worldwide, and fuel extreme weather, like typhoons.
The El Niño weather phenomenon is set to intensify further into 2027 and could be the strongest ever, raising risks of extreme weather into next year, the World Meteorological Organization said on Thursday.
“If this trajectory continues, it may be stronger than anything since our monitoring began. So literally off the charts we have used for the past four decades,” WMO Secretary-General Celeste Saulo told a Geneva press conference, Reuters reported.
The U.N. weather agency said its forecasts showed a near 100% likelihood that El Niño will persist through February 2027, fuelled by exceptionally warm Pacific Ocean temperatures. This is the first time it has expressed such a degree of certainty, the WMO said.
A very strong El Niño can significantly shift rainfall and temperature patterns worldwide, and fuel extreme weather, like typhoons.
“El Niño is being supersized before our eyes. The science leaves no room for doubt: The planet is in uncharted waters, and those waters are heating up,” said United Nations Secretary-General Antonio Guterres.
El Niño is a periodic warming of sea surface temperatures in the eastern Pacific caused by weakening trade winds. It occurs naturally every two to seven years and tends to last up to 12 months, causing intense rains and droughts across Latin America.
This year’s phenomenon has already had an impact on soft commodities in tropical areas, causing a severe food crisis across Central America’s Dry Corridor.
It is set to peak towards the end of this year, the WMO said in a statement. But its effects will continue into 2027 and are set to leave higher global temperatures next year in its wake, Saulo said.
Saulo said the WMO was stepping up preparedness and early warning efforts in preparation.
“WMO is committed to working closely with partners across the United Nations and humanitarian system to provide the climate intelligence and insights needed to support disaster management and climate-sensitive sectors like agriculture, health, energy and water resources,” she said.
Climate Change
Nepal flood rescue mission enters critical phase as thousands remain missing
Nepal’s search, rescue and recovery operation has entered a critical phase after devastating flash floods swept through communities along the Bhotekoshi and Trishuli river systems, leaving hundreds dead and thousands of people still unaccounted for.
The latest figures put the death toll at 734, with 2,498 people still missing. More than 8,000 people have been rescued or evacuated, including foreign nationals.
The disaster struck on August 26 when a massive surge of water and debris tore through communities in northern and central Nepal. The precise cause remains under investigation, although the catastrophe has been linked to a glacier collapse or ice-and-rock avalanche in the Himalayan region.
Rescue teams race to reach trapped workers
Among the most urgent rescue operations is the search for workers believed to be trapped inside hydropower tunnels along the Trishuli corridor.
Authorities say 933 hydropower workers are among those reported missing. At the Trishuli 3A hydropower project, rescuers have inserted a pipe into a tunnel and begun pumping air inside as teams work to reach people who may still be alive.
Specialist teams from neighbouring India and China are assisting with the difficult tunnel operations. Access remains extremely challenging, with roads and bridges destroyed, tunnel entrances buried and sections of infrastructure cut off by mud and floodwater.
Helicopters remain vital
With large sections of the affected region inaccessible by road, helicopters have become a crucial part of the rescue effort.
Military and other rescue aircraft are being used to evacuate survivors, transport food and medical supplies and reach communities cut off by the destruction. Poor weather, mountainous terrain and rising river levels, however, continue to hamper operations.
Authorities have also warned residents to remain vigilant as water levels rise in some rivers and new landslides create additional risks.
Search turns to recovery
As hopes of finding survivors continue, rescue teams are also facing the grim task of recovering and identifying victims.
Hundreds of bodies and human remains have been recovered from flood-affected districts, with some carried considerable distances downstream. The scale of the disaster has placed enormous pressure on local identification facilities, while additional forensic and DNA-testing support is being sought.
Families of missing people have gathered at hospitals, rescue centres and military bases, searching lists of survivors and recovered victims for information about relatives who remain unaccounted for.
International assistance grows
International support is also arriving as Nepal begins the enormous task of providing emergency assistance and planning for reconstruction.
India has deployed specialist rescue personnel and relief supplies, while China is assisting with tunnel rescue operations. Other countries and international organisations are also providing humanitarian assistance and specialist equipment.
The destruction of roads, bridges, homes, power infrastructure and hydropower facilities is expected to create a major long-term reconstruction challenge.
A race against time
For rescuers, the immediate priority remains finding those who may still be alive beneath collapsed structures and inside flooded tunnels.
For families, the operation is becoming a desperate search for answers.
Across the devastated river valleys, rescue workers continue digging through mud and debris while helicopters move between isolated communities. But with thousands still missing and the threat of further flooding and landslides, authorities face a race against time to locate survivors and recover those who did not make it.
Climate Change
China evacuates thousands as Typhoon Narra brings torrential rain
Flooding and waterlogging were also reported in Pingxiang City and Ningming County, with rural roads submerged and farmland inundated.
Authorities in China’s southern Guangxi Zhuang Autonomous Region are evacuating residents trapped by flooding as Typhoon Narra brings heavy rain to the area.
In Shangsi County of Fangchenggang City, floodwater reached around 1.5 metres in some urban areas, inundating major roads and leaving several villages without drinking water, electricity or communications.
Local authorities deployed 50 militiamen to search for and rescue residents overnight using rubber boats and relief supplies. At least 203 people have been safely evacuated.
Flooding and waterlogging were also reported in Pingxiang City and Ningming County, with rural roads submerged and farmland inundated.
More than 400 militiamen were deployed to help evacuate residents, including door-to-door operations. In one severely affected village in Ningming, inflatable boats were used to ferry villagers across a flooded river.
In Youyi Township of Pingxiang, rescuers helped elderly people and children with limited mobility reach safer areas. By Monday morning, local militiamen had assisted 1,499 people trapped by the floods.
Typhoon Narra, the 19th typhoon of the year, was located in the Beibu Gulf early Monday, about 185 kilometres southwest of Beihai, with maximum winds of 23 metres per second near its centre.
The storm was expected to move eastward before turning north, travelling at 5 to 10 kilometres per hour toward coastal areas of Guangxi and western Leizhou Peninsula in neighbouring Guangdong Province.
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