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Water vapor: Water substance in the gaseous phase. In the atmosphere, water vapor rarely occurs in concentrations greater than about four percent by volume. It is a powerful and effective “greenhouse gas.”
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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.
