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Altocumulus clouds: A medium-height cloud (altitude 8,000-20,000 feet) characterized by globular masses, patches or rolls in layers, often with a waved aspect, white and/or gray in color.
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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.
