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Back-door cold front: A cold front (the leading edge of an advancing cold air mass) that arrives from the northeast. Cold fronts usually push across Chicago from the northwest or west.
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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.
