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El Nino: A widespread warming of the surface waters of the eastern tropical Pacific Ocean.
La Nina: A widespread cooling of the surface waters of the eastern tropical Pacific Ocean.
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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.
