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Towering cumulus: A cumulus cloud whose vertical height considerably exceeds its width, with a distinctive cauliflower top but lacking the characteristic anvil of cumulonimbus (the thunderhead).
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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.
