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Severe thunderstorm: A thunderstorm that produces one or more of the following phenomena: a tornado; winds of 50 knots (58 miles per hour) or greater; hail 3/4 inch in diameter or larger.
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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.
