Dense fog advisory in effect until Wednesday morning

Published: Tuesday, Dec. 3, 2013 3:23 p.m. CDT

McHenry County and the Chicago area are under a dense fog advisory until 10 a.m., Wednesday, the National Weather Service announced.

The dense fog will become more widespread this evening and linger into the overnight hours. A dense fog advisory means visibility will be reduced to less than one quarter of a mile.

Motorists are urged to drive slow and use headlights.

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