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Easterly waves: Areas of weak low pressure that form over North Africa and drift to the west over the tropical North Atlantic Ocean. They often serve as “seeding circulations” for hurricanes.
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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 Dennis Haller plus weather producer Bill Snyder contribute to this page.
