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Probability: The chance that a prescribed event will occur, represented by a number in the range from zero to one. The probability of an impossible event is zero and that of an inevitable event is one.
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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.
