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Thermal low (also called heat low): An area of low pressure resulting from intense heating and high temperatures. It is stationary and its wind circulation is weak. A thermal low forms over Arizona in summer.
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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.
