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Roll cloud: A tube-shaped horizontal cloud structure at the leading edge of the base of a thunderstorm, but detached from it. The roll cloud is associated with the storm’s strong, gusty, cool outflow winds.
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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.
