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Water sky: The dark appearance of the underside of an overcast cloud layer when it is over the open water on a large lake (like Lake Michigan). Light shining down onto a water surface is absorbed by the water rather than reflecting upward and illuminating the cloud base.
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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.
