WGN-TV Chief Meteorologist Tom Skilling and the WGN Weather Center staff provide daily coverage of weather in the Chicago area.

Sunday night's 45-degree temperature drop

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Thanks to Midway observer Frank Wachowski for providing us with the actual thermograph temperature trace of the precipitous temperature fall that sent readings crashing 45 degrees in just 12 hours from a balmy 51 degrees at 8 p.m. to a frigid 6 degrees above zero at 8 a.m. Monday morning.

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Chart provided by Frank Wachowski