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Progressive weather: Weather patterns in a constant state of change, or weather patterns that are moving steadily and often rapidly, as contrasted to stagnant or only very slowly moving weather patterns.
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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.
