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Pneumonia front: A cold-frontal passage accompanied by northeast winds, occurring on the western Shores of Lake Michigan, that results in a one-hour temperature drop of 16(degrees)F or greater. The chill of the cold air is strengthened by the cold water of Lake Michigan.
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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.
