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El Niño and La Niña are opposite phenomena that affect weather worldwide by changing the ocean temperatures and currents in the Pacific. Learn how they work, when they occur, and what impacts they have on ecosystems and economies.
El Niño-Southern Oscillation (ENSO) is a global climate phenomenon that emerges from variation in winds and sea surface temperatures over the tropical Pacific Ocean. Those variations have an irregular pattern but do have some semblance of cycles. The occurrence of ENSO is not predictable. It affects the climate of much of the tropics and subtropics, and has links (teleconnections) to higher ...
Learn about the natural climate pattern of El Niño-Southern Oscillation (ENSO), which causes shifts in ocean temperature and weather across the tropical Pacific and beyond. Find out the current status, latest updates, global impacts, and educational resources on ENSO.
El Niño is part of the natural climate phenomenon called the El Niño Southern Oscillation (ENSO). It has two opposite states: El Niño and La Niña, both of which significantly alter global weather.
The term El Niño, in oceanography and climatology, describes the anomalous appearance, every few years, of unusually warm ocean conditions along the tropical west coast of South America. This event is associated with wide-reaching adverse effects on fishing, agriculture, and local weather.
Learn how El Niño, a natural phenomenon of warm Pacific waters, affects weather and climate around the world. Explore data visualizations of ocean and atmospheric conditions, history and teleconnections of El Niño events.
El Niño/La Niña InformationCritical Fire Weather in the West; Monitoring Tropical Storm Erin Gusty winds and low relative humidity will bring critical fire weather conditions to parts of the Great Basin, interior Northwest, and Rockies Thursday. Red Flag Warnings have been issued. While there is still uncertainty in what impacts might occur to the U.S. east coast next week, the risk of ...
El Niño is a warming of the tropical Pacific Ocean that affects global weather patterns. Learn more about El Niño from the USGS, which studies and documents its impacts on climate and natural disasters.
Learn about the natural phenomenon of El Niño / La Niña, its impacts on climate and weather, and WMO's monitoring and prediction of ENSO conditions. Find the latest El Niño / La Niña updates, global seasonal climate outlooks, and resources from WMO and partners.
El Niño is a climate pattern that describes the unusual warming of surface waters in the eastern tropical Pacific Ocean. El Niño is the "warm phase" of a larger phenomenon called the El Niño-Southern Oscillation (ENSO).