Powerful El Niño Could Bring Major Impacts

NOAA’s Climate Prediction Center said on May 14 that El Niño is likely to emerge soon, with an 82% chance during the May-July 2026 period and a 96% chance it will continue through Northern Hemisphere winter 2026-27. The agency said the Pacific remains in ENSO-neutral conditions for now, but ocean and atmospheric signals have moved closer to El Niño thresholds. The latest weekly Niño-3.4 index was plus 0.4 degrees Celsius, while above-average subsurface warmth has expanded across the equatorial Pacific. NOAA said the biggest uncertainty is not whether El Niño forms, but how strong it becomes. ### How close is El Niño to forming now? The Climate Prediction Center said on May 14 that the coupled ocean-atmosphere system still reflected ENSO-neutral conditions. NOAA said sea surface temperatures in the east-central Pacific were near average in the past month, but subsurface temperatures increased for a sixth straight month and westerly wind anomalies were present across parts of the equatorial Pacific. (cpc.ncep.noaa.gov) The 82% probability for May-July 2026 means forecasters expect the transition soon, not that El Niño is already in place. NOAA’s April 16 long-lead outlook had put the chance of El Niño emerging in May-June-July at 61%, showing confidence increased over the past month. ### Could this become one of the strongest El Niño events on record? (cpc.ncep.noaa.gov) NOAA’s official strength table issued in May showed no El Niño category above a 37% chance in any overlapping season through winter. The highest single probability in the table was 37% for a very strong event in November-December-January, while October-November-December showed a 33% chance and December-January-February showed 31%. (cpc.ncep.noaa.gov) The Climate Prediction Center also said the strongest historical El Niño events are marked by sustained ocean-atmosphere coupling through summer, and “it remains to be seen” whether that happens in 2026. NOAA added that stronger El Niño events do not guarantee stronger impacts and instead raise the odds of certain seasonal patterns. (cpc.ncep.noaa.gov) ### What does NOAA say El Niño usually does to U.S. winter weather? The National Weather Service office in Tampa said El Niño winters tend to make the southern tier of the United States cooler and wetter than average, from California to the Carolinas. That same office said the jet stream typically shifts farther south during El Niño, helping steer more storm systems across the South. (cpc.ncep.noaa.gov) NOAA’s April seasonal outlook favored above-normal precipitation for most Atlantic Coast states into the eastern Gulf region in May-July 2026. Seasonal outlooks are probabilistic, and the Tampa office said other climate patterns, including the Arctic Oscillation and Madden-Julian Oscillation, can still alter local outcomes. (weather.gov) ### What could that mean for Florida? Florida sits inside the southern U.S. zone that NOAA says often turns wetter during El Niño winters. For readers in the state, that raises the chance of more frequent frontal systems, heavier seasonal rainfall and water-management issues, though NOAA does not treat those outcomes as guarantees for every county or every storm. (cpc.ncep.noaa.gov) The Atlantic hurricane angle points in the opposite seasonal direction. NOAA Climate.gov said El Niño generally suppresses Atlantic hurricane activity by increasing vertical wind shear over the basin, while favoring stronger hurricane activity in the central and eastern Pacific. ### Why are forecasters cautious about making local promises? (weather.gov) NOAA said on May 14 that the strength of El Niño does not necessarily match the strength of its effects. The agency’s strength-probability page says stronger events often come with higher certainty about expected impacts, but never guarantee them. The Tampa National Weather Service office also said other climate drivers can shape winter weather over Florida and the broader United States. (climate.gov) That is why NOAA points users to separate seasonal temperature and precipitation outlooks rather than treating ENSO status alone as a local forecast. June 11, 2026 is the next date on NOAA’s ENSO calendar. The Climate Prediction Center said it will publish its next ENSO Diagnostic Discussion that day, alongside updated probabilities and links to the latest seasonal outlooks. (cpc.ncep.noaa.gov) (cpc.ncep.noaa.gov) (weather.gov)