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Noctilucent clouds: The highest of all clouds; ice-crystal clouds occurring about 40-60 miles up. They can be seen after sunset when, because of their great height, they are still illuminated by sunlight.
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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.
