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Saharan air layer (SAL): A mass of very dry, dusty air that originates over Africa’s Sahara Desert during the late spring, summer and early autumn, and moves west and out over the tropical Atlantic Ocean. Its dryness inhibits hurricane formation over the 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.
