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Pacific air: A type of air mass whose mild, moist characteristics are originally developed over the Pacific Ocean, but whose characteristics become mild and dry after passage across the western U.S. highlands. In the winter, Pacific air brings mild, dry weather to Chicago.
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Tom Skilling is chief meteorologist at WGN-TV. His forecasts can be seen Monday through Friday on WGN-TV News at noon and 9 p.m.
WGN-TV meteorologists Steve Kahn, Richard Koeneman and Paul Dailey plus weather producer Bill Snyder contribute to this page.
