El Niño, or more precisely the El Niño Southern Oscillation (ENSO) is the name given to a warm ocean current in the southern Pacific off the coast of South America (El Niño) and changing - but connected - levels of barometric pressure in the eastern and western Pacific (Southern Oscillation). El Niño has dramatic effects on the world's weather, from the monsoons of India to the coasts of California.

Climate Prediction Center - Branch of the National Oceanic and Atmospheric Administration
   El Niño / La Niña Home
   ENSO Diagnostic Discussion
   ENSO Educational Materials


El Niño Information - From the National Oceanic and Atmospheric Administration
   El Niño Theme Page - Extensive and technical
   Comparison of Different El Niños

Impacts of El Niño - On the United States and North America

Understanding El Niño and La Niña - USA Today - Good articles and links

International Research Institute for Climate Prediction - Joint effort of Scripps Institution of Oceanography/University of California San Diego and Columbia University's Lamont-Doherty Earth Observatory
   Regional Impacts

San Francisco Chronicle/Examiner articles on El Niño - Stories, photographs, charts and graphics

State of California El Niño Page - Excellent collection of links, including state's preparations to deal with El Niño