US forecaster says more than 83% chance of very strong El Niño through early 2027

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US forecaster says more than 83% chance of very strong El Niño through early 2027

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U.S. forecasters say El Niño is strengthening, with more than an 83% chance that strong-to-very-strong conditions will continue through January-March 2027. NOAA’s Climate Prediction Center said Thursday that sea-surface temperature anomalies exceeded 4 degrees Celsius in parts of the eastern equatorial Pacific, while its Niño-3.4 index reached 2.1 degrees Celsius. The agency said there is an 83% chance during October-December of a historic-strength event, defined as a three-month relative Niño index of at least 2.5 degrees Celsius, surpassing events recorded since 1950. The World Meteorological Organization said Thursday that El Niño is nearly certain to persist through February 2027 and could rank among the strongest since 1950. The forecasts raise risks of altered rainfall, drought, flooding and extreme heat. A Climate Impact Lab projection estimates 451,000 excess heat deaths through February, but that figure is a projection, not a confirmed toll. The estimate compares projected mortality with a normal year.

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U.S. forecasters say El Niño is strengthening, with more than an 83% chance that strong-to-very-strong conditions will continue through January-March 2027. NOAA’s Climate Prediction Center said Thursday that sea-surface temperature anomalies exceeded 4 degrees Celsius in parts of the eastern equatorial Pacific, while its Niño-3.4 index reached 2.1 degrees Celsius. The agency said there is an 83% chance during October-December of a historic-strength event, defined as a three-month relative Niño index of at least 2.5 degrees Celsius, surpassing events recorded since 1950. The World Meteorological Organization said Thursday that El Niño is nearly certain to persist through February 2027 and could rank among the strongest since 1950. The forecasts raise risks of altered rainfall, drought, flooding and extreme heat. A Climate Impact Lab projection estimates 451,000 excess heat deaths through February, but that figure is a projection, not a confirmed toll. The estimate compares projected mortality with a normal year.

Published 2026-10-08 17:12:50 UTC · Published by JQJO

Published by JQJO Editorial Desk · AI assisted

More context

Timeline

On 1950, El Niño records established the modern comparison period.
On 1982, El Niño produced widespread global weather disruptions worldwide.
On 1997, El Niño peaked strongly across tropical Pacific waters.
On 2015, El Niño reached exceptional strength across Pacific waters.
On June 11, NOAA reported El Niño conditions strengthening into winter.
On September 3, WMO forecast persistence through February 2027.
On October 6, FEWS NET assessed food-security risks globally.
On October 7, NOAA GFDL forecast the event nearing peak.
On October 8, NOAA reported greater than eighty-three percent probability.
On October 8, WMO forecast record Pacific temperatures through December.
On December 1 2026 By December 2026, WMO expects El Niño to peak strongly.
On February 1 2027 Through February 2027, WMO expects El Niño conditions to persist.

Why it matters

Immediate US impact: Strong El Niño raises U.S. risks for heat, rain, drought. Possible long-term US impact: Persistent El Niño could reshape U.S. winter weather and agriculture. Most affected groups: California, Gulf Coast, farmers, utilities, insurers, and emergency agencies nationwide. Reader priority: Prioritize NOAA forecasts, observed data, and clearly attributed scientific projections.

Coverage notes

Left: Left coverage emphasizes climate risks, heat exposure, and vulnerable communities. Center: Center coverage emphasizes forecast probabilities, measurements, uncertainty, and practical impacts. Right: Evidence was insufficient to establish qualifying right-leaning direct framing.