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Cumulonimbus mamma: A supplementary cloud feature in the form of hanging protuberances, like pouches, on the under side of the anvil of cumulonimbus (thunderhead) clouds. It is not associated with tornadoes.
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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.
