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The strongest El Niño in living memory is about to get a name. On Thursday morning, the US Climate Prediction Center is expected to confirm that the Pacific Ocean has crossed the threshold for what the media calls a "super" El Niño — a warming event forecast to be stronger than any since records began in 1950.
It is a milestone months in the making. Forecasters have watched the tropical Pacific warm through the autumn, and the numbers now point to an event that could reshape winter weather across the United States and far beyond. Here is what the designation means, what it does not mean, and what to expect in the months ahead.
What is a "super" El Niño?
El Niño is a natural climate pattern in which the surface waters of the central and eastern tropical Pacific become unusually warm. That warmth shifts rainfall and storm tracks around the world. Scientists measure its strength using sea-surface temperature anomalies in a patch of ocean called the Niño 3.4 region.
First, an important correction: "super El Niño" is not an official category. According to the Climate Prediction Center, NOAA's strength tiers top out at "very strong". The nickname "super" is the media's shorthand for an event that crosses the very-strong line — a three-month average warming of at least 2.0°C above normal. The World Meteorological Organization says that line was crossed in the August–September–October quarter, when the anomaly reached exactly +2.0°C.
NOAA began using a newer yardstick in February 2026, the Relative Oceanic Niño Index, which strips out the background warming of the tropical oceans so the El Niño signal stands out more clearly. On that measure, only four winters since 1950 have crossed the +2.0°C mark. This one is forecast to blow past all of them: the WMO expects the anomaly to peak at an average of +3.8°C in the November–January quarter, with the warmest point in December.
Why the timing matters now
The Climate Prediction Center's October 8 discussion kept an El Niño Advisory in force and said the event "continues to strengthen", with a strong-to-very-strong El Niño likely through January–March 2027 at a greater than 83% chance. Its next update is scheduled for today, November 12, and forecasters expect it to confirm that the August–October period cleared the +2.0°C threshold — the formal arrival of the very-strong event. The previous three-month period, July–September, came in at +1.7°C, just short of the line.
The Center also put the chance of a "historic" event — stronger than every El Niño since 1950, defined as +2.5°C or more — at 83% for the October–December quarter and 70% for November–January. In plain terms, this winter is more likely than not to be the strongest El Niño ever measured.
What it means for winter
NOAA's winter outlook for December 2026 to February 2027 says El Niño "looms large". The headline pattern is familiar from past strong events, but amplified: a warmer-than-normal northern United States, and a wetter southern tier, with more storms expected from Southern California across the entire southern US to Florida and along the Eastern Seaboard. The November outlook, updated on October 31, already favours a warmer-than-normal month across most of the country outside the Southwest and Southern Plains, with the best warm odds — 60% to 70% — over the Northern Plains and Upper Mississippi Valley.
None of this is a guarantee for any one place. The Climate Prediction Center stresses that a stronger event makes its typical impacts more likely, but they are "not guaranteed". A super El Niño tilts the odds; it does not write a local forecast. The winter outlook itself gets its next update on November 19.
The effects reach far beyond American weather. Strong El Niños are linked to drought in parts of Australia and Southeast Asia, heavy rain in parts of South America, and shifts in hurricane activity in both the Pacific and the Atlantic. This year's event has already shown its reach: forecasters link it to the Pacific hurricane season's behaviour, and its fingerprints are being studied in everything from ski-season outlooks to global food prices.
How long will it last?
Forecasters expect the event to remain in effect through the winter and fade in spring 2027, when La Niña conditions — the cool opposite phase — are forecast to take over. That transition matters: the swing from a record-warm Pacific to a cool one can itself bring volatile weather.
The honest version of this story is that nobody has seen an El Niño this strong in the modern record, so the usual rules of thumb come with wider error bars than normal. What is certain is the measurement: the Pacific is warmer than it has been in any El Niño since 1950, the official confirmation is expected today, and the winter ahead will be shaped — more than any winter in decades — by what happens in a patch of ocean thousands of miles from shore.
For more on how scientists track the planet's changing climate, see how NASA's twin ESCAPADE probes slingshotted around Earth to reach Mars. According to reports from FOX Weather and the World Meteorological Organization, the designation is expected within hours.