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Aurora: Overlapping curtains of green, white, red and blue light occasionally seen in the night sky; known as aurora borealis in the Northern Hemisphere, aurora australis in the Southern Hemisphere.
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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.
