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Control day: A day on which the weather is supposed to, according to folklore, provide the key for the weather in a subsequent period. In the United States the best known of these days is Groundhog Day (Feb. 2).
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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.
