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Sea level: The height of the ocean after averaging out variations due to waves and tides. Sea levels rose six inches in the 1900s. A much greater rise, 2-4 feet (or even more), is possible this century.
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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.
