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Thermal: A transient bubble or small-scale current of rising air.
Updraft: A small-scale current of air with marked, sometimes violent, upward motion usually beneath or within convective (cumulus) clouds.
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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.
