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Closed upper low: A nearly circular storm system, generally above 15,000 feet, around which winds circulate in counterclockwise fashion. Ground-level weather is unsettled and showery.
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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.
