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Prevailing westerlies: Two atmospheric belts paralleling the Equator at 35-55 degrees N and S latitude, in which the dominant motion of weather systems is from west to east. Most of the United States lies within the Northern Hemisphere zone.
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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.
