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 through the Northern Hemisphere winter of 2026-27.
The Climate Prediction Center, NOAA’s main seasonal forecast office, issued an El Niño Advisory on June 11. In its diagnostic discussion, the center said El Niño conditions developed over the previous month as sea-surface temperatures ran above normal across the central to eastern equatorial Pacific Ocean.
For people outside the weather field, the bottom line is simple: this is a signal to pay attention to NOAA’s seasonal outlooks, especially for winter planning, travel, and — in some places — flood risk.
What is El Niño?
El Niño is one phase of the El Niño-Southern Oscillation, or ENSO, a climate pattern that shifts between El Niño, La Niña and neutral conditions. The pattern starts in the tropical Pacific, where warmer or cooler-than-average ocean water can change winds, rainfall and storm tracks far beyond the Pacific basin.
NOAA’s Climate.gov explains that when forecasters talk about El Niño, they are looking for sustained warming in the tropical Pacific. NOAA’s Climate Prediction Center said the latest weekly Niño-3.4 index was +0.7 degrees Celsius, with the Niño-4 index also at +0.7 degrees and the Niño-1+2 index at +2.1 degrees. Those indexes are ways of measuring sea-surface temperature anomalies in different parts of the equatorial Pacific.
Why are forecasters watching this one closely?
The Climate Prediction Center said model guidance, including the North American Multi-Model Ensemble and NOAA’s CFSv2 model, points to further strengthening through winter. The center also said there is a 63% chance of a very strong El Niño during November-January, a level it said could rank among the largest events in the historical record going back to 1950.
That does not mean the same weather everywhere. El Niño changes the odds, not the outcome. Seasonal outlooks can tilt the chances toward certain temperature and rainfall patterns, but they do not replace day-to-day forecasts.
What could it mean for the United States?
NOAA says El Niño can influence weather patterns across the country. In some places, that can mean a different winter temperature pattern than usual. NOAA’s Ocean Service also says El Niño can raise the risk of high-tide flooding in some U.S. locations, which matters for coastal communities and low-lying areas.
For Washington, D.C., the main takeaway is not a local emergency bulletin. It is a national weather signal that can affect winter planning, travel and flood awareness. People who live, work or travel in flood-prone coastal areas should keep an eye on NOAA’s seasonal outlooks and local flood guidance as winter gets closer.
Why forecasts can differ
Not every forecast source uses the same language or timing. NOAA’s Climate Prediction Center says El Niño is already present. Columbia University’s IRI forecast page says conditions are strengthening across the tropical Pacific and are likely to continue intensifying. Other NOAA education pages describe the broader ENSO pattern and how it is defined.
That is normal in climate forecasting. Models update often, and forecasters can agree on the direction while still differing on strength or exact timing.
What to watch next
The key updates to follow are NOAA’s seasonal outlooks, especially as the forecast window moves into late fall and winter. The most important question is not whether El Niño exists — NOAA says it does — but how strong it becomes and how much it shifts weather patterns in the months ahead.
