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World’s lowest air pressure: 25.69 inches of mercury over the Pacific Ocean 520 miles northwest of Guam, in the eye of Typhoon Tip, on Oct. 12, 1979.
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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.
