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Cold-air funnel: A funnel cloud or, rarely, a small and relatively weak tornado that develops from a thunderstorm, a shower or merely a cumulus cloud when the air aloft is unusually cold.
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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.
