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Cumulonimbus: The thunderhead, the dense and vertically developed cloud that produces thunderstorms. The top is often anvil-shaped and flat. The cloud typically rises to elevations of 35,000-60,000 feet.
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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 Dennis Haller, Richard Koeneman plus weather producer Bill Snyder contribute to this page.
