With the prevailing jet stream moving across the Arctic or north Pacific Ocean and then onto the North American continent via the Pacific Northwest, it is no wonder that this air arrives laden with the moisture and cold it has picked up along the way. Often the result is orogenic precipitation (mountain rain), and in the winter, mountain snow. This high altitude air mass is a good predictor of forthcoming weather. This jet stream model produced by San Francisco State University extrapolates current jet stream wind and pressure gradients into a prediction of tomorrows jet stream. Animation control by www.duniatv.net. To animate click start.
Jet Stream
Jet Stream
Courtesy San Francisco State University

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Updated by Grayrabbit 19.12 on 12.11.2009      Thanks to all our contributors

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Jet Stream Northwest Weather and Avalanche Center National Oceanographic and Atmospheric Administration (NOAA) National Weather Service Water Vapor Satellite Image Pacific Northwest Seismograph Network, University of Washington Whistler Cam Highway 99 US Forest Service