NOAA center provides forecasts, impact projections and historical data on the cyclical climatic phenomena known as El Nino and La Nina.

Provides climate forecasts and archives of past observations from the Center for Ocean-Land-Atmosphere Studies.

Franklin Institute presents facts about this climatic event, and instructions for an experiment to learn about the physical principles involved.

Find out about El Nino, an influential weather phenomenon, and access recent data and forecasts.

Enormous range of information on El Nino, including basic facts and explanations, FAQs, current news updates, publications, images, and links.

Association of Bay Area Governments provides El Nino forecasts, preparation advice and satellite imagery.

Explains the phenomena, forecasts future occurrences, compares past El Ninos, and discusses their impact on Canada. In English or French.

University's Department of Atmospheric Sciences provides this colorful tutorial on El Nino. Covers causes, impacts and forecasting.

Learn about the origins, effects and cycles of this climatic phenomenon.

Learn about this weather phenomenon that occurs in the Pacific, and study graphs and charts. From the National Oceanic and Atmospheric Admin.

Online NewsHour forum answers commonly asked questions on El Nino and its effect.