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CPC - La Niña/El Niño Coverage - Regularly updated discussion and coverage of the La Niña/El Niño weather system including global and regional impacts and forecasting..

CPC El Niño/Southern Oscillation (ENSO) - Coverage of the weather system from the Climate Prediction Centre, including forecasts, historical info, and the impact of the system on weather patterns..

El Niño and La Niña: Tracing the Dance of Ocean and Atmosphere - National Academies popular article describes the basic scientific research that led to our current understanding of these weather phenomenon..

El Niño/La Niña Watch - Archive of images and news releases about observations of the El Nino/La Nina phenomenon in the Pacific Ocean by the U.S./French TOPEX/Poseidon, Jason-1, and other NASA/JPL satellites and instruments..

What is an El Niño? - Illustrated explanation with realtime graphics and animations of data from the tropical Pacific Ocean. From NOAA..

What is La Niña? - Illustrated explanation with realtime graphics and animations of data. Also numerous links to reference material from NOAA..