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Tornado alley: That portion of the United States in which tornadoes occur most frequently, encompassing the Plains area between the Rocky Mountains on the west and the Appalachians on the east.
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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.
