El Niño has begun, and its development could strongly reshape global weather over the coming months.
The phenomenon occurs when surface waters in the central and eastern tropical Pacific become warmer than usual and the atmosphere begins to respond to that warming.
This is not just a local oceanic anomaly.
Because the tropical Pacific is one of the main engines of Earth’s climate system, a change there can alter wind patterns, rainfall, storm tracks, drought risk and global temperatures.
Current observations show that the ocean and atmosphere are now coupled in a way consistent with El Niño. Sea surface temperatures are above average across the central and eastern equatorial Pacific, the Niño-3.4 region has crossed the El Niño threshold, and wind patterns over the tropical Pacific have shifted.
Forecast models suggest that this event is likely to strengthen through late 2026 and into the Northern Hemisphere winter of 2026-27. There is a meaningful possibility that it could become a very strong El Niño, sometimes informally called a “super El Niño,” although that outcome is not guaranteed.
If it does intensify as projected, the consequences could be widespread. El Niño often increases the likelihood of wetter conditions in parts of the southern United States and the eastern Pacific side of the Americas, while raising drought risk in regions such as Indonesia, parts of Australia, southern Africa and the Sahel. It can also suppress Atlantic hurricane activity by increasing wind shear over the tropical Atlantic, while shifting storm and rainfall patterns elsewhere.
These are not deterministic predictions for every country or region, but changes in probability: El Niño loads the dice toward certain kinds of weather extremes.
A very strong El Niño would be especially important because it is occurring in a world that is already unusually warm. El Niño naturally releases additional ocean heat into the atmosphere, so when it happens on top of human-driven global warming, it can push global temperatures even higher and increase the risk of heatwaves, marine heat stress, coral bleaching, drought, crop disruption and intense rainfall in vulnerable regions.
Previous very strong El Niño events have been associated with major climatic and humanitarian impacts, but each event has its own structure, timing and regional footprint.
The most careful way to understand this is not as a single global disaster forecast, but as a major shift in climate risk. The planet’s background temperature is higher than it used to be, the oceans contain more heat, and the atmosphere can hold more moisture.
A strong El Niño in that context can amplify extremes that would already be concerning. The coming months will depend on how strongly the tropical Pacific continues to warm and how the atmosphere responds, but the signal is now clear enough for governments, farmers, water managers, health systems and disaster agencies to pay close attention.
@NOAA