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Tropical cyclone: A tropical or subtropical low pressure system, classified by highest sustained winds: disturbance, no organized winds; depression 38 m.p.h. or less; storm 39-73; hurricane 74 or higher.
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For up-to-the-minute forecasts by Tom Skilling and additional weather data online, visit chicagotribune.com/weather
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.
