The World Meteorological Organization predicts an 80-90 % chance that El Niño will develop during the 2024 summer, potentially sparking extreme heat, drought, heavier rains and higher sea‑level temperatures worldwide. The agency urged global preparedness as the phenomenon could amplify existing climate‑change effects, even though it is a natural cycle.
"Fueled by unusually warm ocean waters in the tropical Pacific, El Niño conditions are developing and are set to influence global temperature and rainfall patterns," the United Nations' weather and climate agency said.
Forecasts from the WMO global network"indicate a pronounced shift toward El Niño conditions, with probabilities reaching 80 percent for June-August", the Geneva-based organization said. El Niño is a natural climate phenomenon that warms surface temperatures in the central and eastern equatorial Pacific Ocean, bringing worldwide changes in winds, pressure and rainfall patterns.
Habagat rains to affect Metro Manila, parts of Luzon, VisayasThe likelihood of El Niño developing by November is"near or above 90 percent", and most forecast models suggest it will be"at least moderate -- and possibly strong", the WMO said in its quarterly El Niño/La Niña update. WMO chief Celeste Saulo said the world therefore needed to get ready for an El Niño which could"exacerbate drought and heavy rainfall and increase the risk of heatwaves both on land and in the ocean".
The last El Niño contributed to making 2023 the second-hottest year on record and 2024 the all-time high at around 1.55C above the 1850-1900 pre-industrial average. In late April to mid-May, the sea-surface temperature in the central-eastern Equatorial Pacific -- the area used as a monitoring reference -- was approaching El Niño thresholds, the WMO said, with sub-surface temperatures more than 6C above average.
Meanwhile, the Southern Oscillation Index -- the atmospheric component of El Niño -- is also consistent with El Niño conditions developing. The WMO said there was no evidence that climate change increases the frequency or intensity of El Niño events.
However, it can amplify the associated impacts, it says, because a warmer ocean and atmosphere increase the availability of energy and moisture for extreme weather events, such as heatwaves and heavy rainfall.
"The world must treat it as the urgent climate warning it is. El Nino conditions will pour fuel on the fire of a warming world. Impacts will hit even harder, travel even farther, and cross borders with devastating speed.
"The only effective response is climate action equal to the crisis -- ending the addiction to fossil fuels, accelerating the shift to renewables, protecting the most vulnerable, and delivering early warning systems for all. "The WMO said that for June to August, forecasts project"a nearly universal dominance of above normal temperatures in nearly all parts of the globe".
This increases the risk of compounding hazards in some regions, and accelerating the onset of drought conditions where rainfall is reduced, it said. Regional climate centers are predicting"below-normal" rainfall during the critical June-September rainy season in the northern Greater Horn of Africa; below-average monsoon rainfall in south Asia; and drier and warmer summer conditions in central America.
During the northern hemisphere summer, warm waters associated with El Niño can fuel hurricanes in the central and eastern Pacific, while hindering their development in the Atlantic Ocean. The WMO hopes advance warning will guide preparedness, especially in climate-sensitive sectors like agriculture, water management, energy and health. —
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