Getting your Trinity Audio player ready...
Ground truth: A direct measurement or observation of the state of the weather to verify information determined remotely. Radar deter-minations of severe weather often require ground-truth verification.
———-
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.
