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Ground fog: Fog that is shallow and usually results from nighttime radiational cooling of the air. It does not extend up to the base of any clouds that may lie above, and it does not obscure the entire sky.
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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.
