New Englanders have a saying: "If you don't like the weather, just wait a minute." Weather forecasts may be more stable in other parts of the world, but the basic idea stands. Weather is dynamic, the product of interacting forces we are only beginning to understand. Witness the weather extremes caused by El Niño in 1997 and 1998. El Niño raised water temperatures in the Pacific and the effects were felt worldwide: crop failures, disease outbreaks, excess snow, or too little rain. Journalists have painted a picture of El Niño as an isolated event, a freak weather occurrence. Weather may change on a daily basis, but climate changes over geologic time. Join us as we explore the forces behind the weather.