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Sleet: Precipitation in the form of small ice pellets. Sleet forms when raindrops (or largely melted snowflakes), originating in warmer air aloft, fall through a layer of subfreezing air at ground level and then freeze on their way down.
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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.
