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Cold frontal passage: The movement across a location of the transition zone (front) between two air masses, one relatively cold and the other relatively warm, moving so that the colder air replaces the warmer air.
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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.
