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Big bags: A British colloquialism for cumulonimbus mamma, hanging protuberances, like pouches, on the under surface of the anvil of cumulonimbus clouds (the clouds that bring thunderstorms).
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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.
