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Precipitation: All of the kinds of water particles, whether in liquid or frozen form, that fall from the atmosphere and reach the ground. Dew, frost and fog are not considered to be precipitation.
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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 meteorologist Dennis Haller contributed to this page.
