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Illinois tornado season: The four-month period from March through June. More tornadoes occur in Illinois in April than in any other month, but the state’s (and the nation’s) worst tornado–the Great Tri-State Tornado–was a March event (March 18, 1925), claiming 695 lives.

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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.