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Unstable air: A layer of air or an air mass in which vertical air motions are likely to occur, usually resulting when warmer air lies beneath cooler air. The lower few thousand feet of the atmosphere is more unstable in the summer than in the winter.
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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.
