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Vertebratus: Any clouds, the elements of which are arranged in a manner suggestive of vertebrae, ribs, or a fish skeleton. The term applies mainly to cirrus clouds.
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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.
