The El Niño wrecking ball UN warning landed in Geneva on Wednesday, October 21, when the World Meteorological Organization said its new seasonal outlook expects central Pacific temperatures to rise about 3.8 degrees Celsius above normal between November and January — a figure its secretary-general said the agency has simply never recorded before.
World / Climate — the WMO’s October 21 outlook pushes the forecast past every previous El Niño in its records, and the UN’s aid chief is asking governments to prepare now, not in December
What the WMO actually said on October 21
The October 21 presentation was not a repeat of the agency’s earlier outlook. On October 8, the WMO forecast a seasonal average of about +3.7°C for October–December. The new outlook moves the window forward to November–January, raises the expected peak to about 3.8°C, and adds an explicit humanitarian call to action from the UN’s aid leadership alongside the meteorology. Saulo told USA TODAY the event is “literally off the monitoring charts that we have used for the past four decades,” and that it is forecast to peak later in 2026, “but its impacts will be felt long after that.” NOAA’s Climate Prediction Center has likewise said this El Niño is already at record strength and is expected to keep intensifying over the next few months.
El Niño is the warm phase of the El Niño–Southern Oscillation, a natural cycle that typically occurs every two to seven years. It is not caused by climate change, Reuters noted in its Geneva report, although global warming can make El Niños more intense. The pattern raises global temperatures and disrupts rainfall — drought in some regions, heavy rain in others — and the WMO said the extremes already being reported are expected to “multiply — and cascade — as El Niño intensifies.” Emily Becker, deputy director of the Cooperative Institute for Marine & Atmospheric Studies at the University of Miami, told USA TODAY that confidence in the forecasts is now “very high” and that the very strong El Niño will certainly last through the next several months.
The regional map in the outlook
The WMO’s outlook, summarised by USA TODAY, tilts the odds in different directions by region. In the Americas: increased rainfall in southern parts of western South America and in portions of North America and the northern Caribbean, while drought risk rises in parts of Central America, the southern Caribbean and the Amazon. In East Africa: wetter-than-normal conditions are likely during the October–December rainy season, raising flooding concerns. In southern Africa, by contrast, the risk is drier conditions from the typical start of the rainy season in November, affecting crop production, water availability and livelihoods. In Southeast Asia: warmer conditions and rainfall deficits increase heat exposure and put pressure on agriculture and water supplies, including the wildfire and smoke-haze risks already being seen. Reuters added that El Niño-linked extremes could worsen pressure on housing, water, sanitation and health services.
Why this matters
The number that matters is not just 3.8. It is what 3.8 sits on top of. Previous record El Niños peaked at around 3 degrees above normal in the WMO’s records, Saulo said, and the 2015–16 event — seasonal average +2.6°C on the Niño 3.4 measure the agency cited earlier this month — still produced droughts, floods and food emergencies on several continents. A forecast peak roughly a full degree beyond the strongest events in the modern record does not mean impacts scale neatly by a degree; it means forecasters are describing a pattern stronger than the one their impact tables were built from. Michael Mann, a climate scientist at the University of Pennsylvania, told USA TODAY: “This will certainly be an historic El Niño” and the “biggest event on record,” while cautioning that reliable records go back less than a century, which makes it hard to judge how unusual it is over longer spans.
Second, the timing is unforgiving. The peak arrives around December — in the middle of southern Africa’s planting season, East Africa’s short rains, Southeast Asia’s dry-season water planning and the North American winter storm season. Fletcher’s estimate that some 50 million people could face increased hunger is the humanitarian translation of that calendar: crops are planted, or fail to be, in the next eight weeks, long before the Pacific cools. That is why the WMO and the UN aid chief presented the outlook together and called for urgent preparation, rather than treating it as a routine seasonal update. Readers following the earlier stages can compare this outlook with our coverage of the research estimating the human toll of a super El Niño and the California state emergency declared to prepare for this event.
Context: how we got here
This event has been building in plain sight. The WMO reported the Niño 3.4 index rising from +1.6°C above normal in June 2026 to +2.5°C in August, and on October 8 it put the chance of the event persisting through February 2027 at near 100 per cent, calling it potentially one of the strongest since at least 1950. NASA satellites have tracked Kelvin waves carrying warm water eastward across the Pacific through 2026, raising sea levels in the eastern Pacific by as much as 30 to 40 centimetres in places. In the United States, NOAA National Weather Service director Ken Graham warned earlier in October that a very strong El Niño tilts the odds toward stormier weather across the South, and that heavy rain on dry soil can fuel flash floods and mudslides even where it relieves drought. The flooding already seen around Santiago, covered in our report on the Chile floods during the rainiest October in decades, is the kind of early impact the WMO expects to multiply.
Who benefits, who loses — and what critics say
There are relative winners in any El Niño map, and honesty requires naming them. Drought-afflicted parts of the U.S. South and parts of western South America may get rain they badly need; ski and water-storage regions in parts of North America can gain from a stormier winter. The losers are clearer: smallholder farmers in southern Africa planting into a forecast dry start, East African communities in flood-prone settlements, Southeast Asian cities facing heat and haze, and aid agencies whose budgets are set months before a hunger figure like Fletcher’s 50 million becomes visible. Fraser Shilling of UC Davis, in a recent California study cited by USA TODAY, warned that this El Niño converges with human-caused sea-level rise, leaving coastal roads such as California’s Highway 37 “extremely vulnerable to floods and failure during this winter’s coming El Niño.”
The scientific argument is narrower than the headlines suggest. Mann noted that El Niño warming “adds to human-caused warming in such a way that we see new records set every time we get a major El Niño event,” and that he was a lead author on research finding El Niño contributed substantially to record 2024 global temperatures. But he also said the science is “very unclear” about whether climate change is increasing El Niño amplitude, with many models predicting the opposite. Becker’s caution points the other way on certainty: even in a strong El Niño, “the weather is always full of surprises,” and short-term forecasts still matter. Both can be true — a very high-confidence seasonal pattern, and genuinely uncertain local outcomes week to week.
What the numbers actually imply
Put the figures in sequence. June: +1.6°C. August: +2.5°C. October 8 forecast for October–December: about +3.7°C. October 21 forecast for November–January: about 3.8°C, peaking around December. Each update has moved the peak later and higher, which is the opposite of a pattern that is fizzling early. Against the previous record seasonal average of +2.6°C in 2015–16, a 3.8 peak is not a marginal beat; it is a break with the recorded range, which is why Saulo reached for “beyond that limit” and “off the monitoring charts” rather than a percentage. USA TODAY also noted El Niño events of this kind can trigger disruption to agriculture, infrastructure and supply chains potentially causing trillions of dollars in damages worldwide — a reminder that the costs arrive through food prices and insurance losses far from the Pacific, not only through flooded or parched districts inside the outlook map.
What happens next
The next test is November. If East Africa’s short rains arrive at the heavy end of the outlook while southern Africa’s rains fail to start, Fletcher’s hunger warning stops being a projection and becomes an appeals process — governments and agencies that pre-position food, seed and cash support in November spend a fraction of what emergency airlifts cost in February. In the Americas, the first U.S. winter storms and South American rainfall totals will show whether the “stormier South” tilt is verifying. And in Geneva, the WMO’s next update will show whether 3.8 was the ceiling or merely the latest step. The agencies’ message on October 21 was unusually blunt for a seasonal outlook, and it was aimed at exactly this window: the forecast is as good now as it is going to get, Becker said, so preparation delayed is preparation denied. Whether governments act on a warning delivered in the language of a wrecking ball is the story the next three months will tell.
Sources: Reuters, October 21, 2026 (Geneva report on the WMO outlook, Saulo and Fletcher remarks, 50 million hunger figure); USA TODAY, October 21, 2026 (Saulo “off the monitoring charts”, Mann, Becker, Graham and Shilling remarks, regional outlook details; contributing: Reuters); WMO, October 2026 Global Seasonal Climate Update background (Niño 3.4 progression, near-100% persistence through February 2027).