WASHINGTON, July 7 (San Diego News Online) — NOAA forecasters say El Niño conditions are already present in the tropical Pacific and are expected to strengthen into the Northern Hemisphere winter of 2026-27. The National Weather Service’s Climate Prediction Center issued an El Niño Advisory on June 11, 2026, and said there is a 63% chance of a very strong El Niño during November-January.
For readers, the main takeaway is simple: this is a seasonal forecast signal, not a local storm warning. El Niño can tilt the odds for temperature, rain, and storm patterns, but it does not guarantee any one weather outcome in Washington or anywhere else.
What is El Niño?
El Niño is the warm phase of the El Niño-Southern Oscillation, or ENSO, a recurring climate pattern in the equatorial Pacific Ocean. NOAA’s Climate Prediction Center says it develops when sea surface temperatures in the central and eastern equatorial Pacific rise above average. The agency says the latest weekly Niño-3.4 index was +0.7 degrees Celsius, with the Niño-4 index also at +0.7 degrees Celsius and the Niño-1+2 index at +2.1 degrees Celsius.
In its advisory, NOAA said El Niño conditions developed over the previous month after above-average sea surface temperatures first appeared in the far eastern equatorial Pacific in early February 2026 and spread across the central and eastern Pacific by mid-April. NOAA said its North American Multi-Model Ensemble, including the NCEP CFSv2 model, points to further strengthening into the winter.
Why does NOAA care so much about this pattern?
Because El Niño can affect weather far from the Pacific. NOAA’s Climate.gov explainer says ENSO is one of the main drivers that forecasters watch because it can influence rainfall, temperatures, and storm tracks around the world. NOAA’s Ocean Service says El Niño may also raise the risk of high tide flooding in some U.S. locations.
That does not mean every place will see the same effects. Seasonal forecasts change the odds, not the outcome. A stronger El Niño can raise the chance of certain winter patterns, but local weather still depends on many other factors.
What should people do now?
For most people, the practical step is to watch NOAA’s seasonal updates, especially if they rely on winter outlooks or live near the coast. If you are in an area prone to tidal flooding, NOAA says to pay attention to local flood guidance and future outlooks as the winter approaches.
For Washington-area readers, the federal forecast matters most as a heads-up that the bigger climate pattern is shifting. NOAA’s advisory shows that forecasters are watching a growing El Niño signal now, with the strongest odds of a very strong event during November-January.