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Heat index: Given the temperature and relative humidity, how hot air feels to an “average” person, assuming a 5 m.p.h. wind is blowing against a 147-pound person walking in light clothes at 3.1 m.p.h.
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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.
