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Buttermilk sky: A sky peppered with patches of mid-level altocumulus clouds or high-level cirrocumulus clouds that take on a globular appearance similar to the texture of cultured milk; a “mackerel sky.”
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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.
