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Radiational cooling: The cooling of the ground and adjacent air, accomplished mainly at night, whenever the surface suffers a net loss of heat due to infrared radiation. It is especially effective when the air is very dry.
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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.
