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Tropical cyclones: Low pressure systems that form over tropical oceans, classified according to wind speeds. Tropical depression: up to 38 m.p.h.; tropical storm: 39-73 m.p.h.; hurricane: 74 m.p.h. and higher.
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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.
