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High-level thunderstorm: A storm whose base is at least 7,500 feet above the surface. These storms usually form over arid regions, and their rainfall frequently evaporates before it reaches the ground.
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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.
