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Thaw: A spell of mild weather in the winter sufficiently warm to cause snow and ice to melt; to change from ice to water by gradual warming; to change from a frozen to unfrozen state, as when soil thaws.
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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.
