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Blood rain: Rain of reddish color caused by foreign matter (such as pollen or red dust) picked up by raindrops as they fall through the atmosphere.
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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.
