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Gross precipitation: The amount of precipitation measured in the open; precipitation that is not intercepted by vegetation like trees or grass. Large, dense trees can intercept up to 0.30″ of rain.
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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.
