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La Nina: A widespread cooling of the surface waters of the eastern tropical Pacific Ocean–the opposite of El Nino. The influences of La Nina and El Nino on trade winds form extremes of the atmospheric trade wind fluctuations termed the Southern Oscillation.
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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.
