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Deepening low: A low pressure system whose central air pressure is decreasing; a low pressure system that is strengthening. The opposite of a “filling low.” Associated weather becomes more vigorous.
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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.
