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Heat low: A low pressure area caused by intense surface heating. It is stationary over the area that produces it and its wind circulation is weak. Summer example: low pressure along the California-Arizona border.
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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.
