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Cumulus clouds: Flat-bottomed warm-season clouds prevalent in the afternoon; resembling piles of cotton, they grow vertically, appearing as mounds or towers with upper portions like cauliflower.
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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.
