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Squall line: A line of thunderstorms sometimes several hundred miles in length, with individual storms strung out along the line. Squall lines in the United States are the world’s strongest and most severe.
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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.
