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Climate Change

Explainer: How El Nino is helping drive heatwaves and extreme weather

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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

Strong El Niño could push 49 million more people into acute hunger, UN agency says

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A powerful El Niño weather event could push an additional nearly 49 million people into acute food insecurity across ‌some of the world’s most vulnerable regions by the end of next year, the World Food Programme said on Wednesday.

The U.N. agency said in a report that there was an 81% chance of a very strong El Niño event, with sea surface temperatures at their warmest levels since at least 1982 and potentially making it the strongest such event ​since 1950, Reuters reported.

El Niño, a periodic warming of ocean surface temperatures in the Pacific, alters global weather patterns and is often associated ​with drought in Southern Africa, delayed monsoons in parts of Asia and erratic rainfall elsewhere.

“These are events that ⁠in the past have triggered large-scale hunger,” Jean-Martin Bauer, director of WFP’s Food Security and Nutrition Analysis Service, told reporters.

Based on an analysis of 45 countries ​deemed vulnerable to the adverse effects of El Niño, WFP estimates that the number of people facing acute food insecurity could rise by almost ​49 million to a total of 274 million people, an increase of 22%, relative to the baseline population already experiencing crisis-level food insecurity or worse.

Central America and Southern Africa are expected to be among the hardest-hit regions, with the number of food-insecure people set to increase by 83% in Central America and nearly 75% in Southern Africa, the ​WFP report said.

Southern Africa as well as South America and the Caribbean could each see more than 12 million additional people fall into acute ​food insecurity.

Bauer said global food markets entered the El Niño period in a relatively strong position following good harvests in 2025, but warned that conflict in the ‌Middle East ⁠and potential weather-related crop losses could put further upward pressure on prices.

While past El Niño events have not typically triggered major global food price spikes, regional shortages and higher prices could worsen food access for vulnerable households, he said.

Funding cuts from U.S. and European donors in 2025 were also hampering efforts to monitor the developing crisis, with Bauer describing a growing drought of food-security data used to assess the impact of El Niño.

WFP conducted ​about 1.1 million household surveys in ​2024, compared with about 800,000 ⁠in 2025, while data collection has fallen further this year due to funding restrictions.

“At a time when you have a risk like an El Niño, it is important to have high-frequency data collection,” Bauer said, warning ​that reduced monitoring could make it harder to identify emerging food crises quickly.

EARLY ACTION REQUIRED

WFP said current ​forecasts point to rainfall ⁠deficits in parts of East Africa, the Sahel, Central America and the Caribbean, while flood risks could rise in Somalia and neighbouring areas.

Significant impacts are also projected across South and Southeast Asia, where drought risks, uneven monsoons and localized flooding could disrupt agricultural production, the report stated.

The agency stressed that ⁠the forecasts remain ​uncertain and that impacts will vary across regions, but warned that governments and aid ​agencies needed to prepare.

Richard Choularton, director of WFP’s Climate and Resilience Service, said the agency had scaled up anticipatory action programmes in 18 countries, reaching more than 1.3 million people so ​far this year with cash and other assistance to help in the event of extreme weather.

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Climate Change

Heavy monsoon rains claim lives across India as flooding and landslides continue

Further northeast, flood conditions in Assam have shown slight improvement, although nearly 179,000 people remain affected across seven districts.

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Heavy monsoon rains continue to batter large parts of India, triggering deadly landslides, flash floods and widespread disruption across several states.

In the southern state of Karnataka, three members of the same family were killed early Sunday after a rain-triggered landslide caused a hill to collapse onto their home in Shivamogga district. The state has experienced moderate to heavy rainfall over the past two days, with schools closed in several districts, including Karwar, Udupi, Chikkamagaluru and Dakshina Kannada.

Rivers in parts of Karnataka remain above danger levels, while flooded roads and waterlogged homes have prompted authorities to issue a high alert and urge residents to avoid rivers and low-lying areas.

In neighbouring Kerala, at least eight people have died in rain-related incidents after torrential downpours triggered landslides, flash floods and extensive damage, particularly in the state’s hilly regions. Several rivers burst their banks overnight, inundating towns across central districts. Authorities have opened 65 relief camps, providing shelter to more than 1,400 displaced residents.

Further northeast, flood conditions in Assam have shown slight improvement, although nearly 179,000 people remain affected across seven districts. The death toll from the state’s floods stands at 82, with thousands still living in relief camps. Several rivers, including the Dikhow and Dhansiri, continue to flow above danger levels, while more than 15,000 hectares of farmland remain submerged.

The Indian government has approved the early release of more than 21 billion rupees from the State Disaster Response Fund to support seven flood-affected states.

The India Meteorological Department has forecast heavy to very heavy rainfall across several regions, including Karnataka, Kerala, Rajasthan, Assam, Nagaland, Manipur, Mizoram, Tripura, West Bengal and Sikkim. Thunderstorms, lightning and strong winds are also expected in many parts of the country, with authorities urging residents in vulnerable areas to remain alert.

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Climate Change

Hundreds of thousands flee as devastating wildfires rage across France and Spain

Firefighters, military personnel and emergency responders have been deployed across the affected regions, while thousands of residents remain displaced.

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Hundreds of thousands of people have been forced to evacuate their homes as massive wildfires continue to sweep across parts of France and Spain, prompting emergency declarations and international assistance.

Authorities say more than 267,000 people have been evacuated as the fast-moving blazes, fueled by high temperatures, strong winds and dry conditions, continue to spread across large areas of both countries.

In France, officials ordered the complete evacuation of the Cap Ferret peninsula on the Atlantic coast as wildfires burned through more than 10,000 hectares of forest. Thousands of residents and tourists were instructed to leave the area by road and boat as flames advanced despite extensive firefighting efforts.

French President Emmanuel Macron described the situation as “very intense,” while the government activated the European Union’s Civil Protection Mechanism, bringing in additional firefighting aircraft from other EU member states to help battle the blazes.

In neighboring Spain, the government declared a national emergency after multiple wildfires threatened communities west of Madrid and in the province of Ávila. Authorities warned that several fires risked merging into larger fronts, complicating efforts to contain them.

Firefighters, military personnel and emergency responders have been deployed across the affected regions, while thousands of residents remain displaced.

Scientists have repeatedly warned that climate change is increasing the frequency and intensity of extreme heatwaves and wildfire conditions across southern Europe, with prolonged drought and soaring temperatures creating ideal conditions for rapidly spreading fires.

No final estimate of the damage has yet been released, and officials cautioned that dangerous weather conditions are expected to persist, raising concerns that the fires could continue to spread in the coming days.

Emergency services remain on high alert as authorities urge residents in affected areas to follow evacuation orders and avoid travel near active fire zones.

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