CHICAGO (WBBM NEWSRADIO) -- Dense fog is expected to sweep over the Chicago area Monday morning, according to the National Weather Service.
Areas of dense fog over northern Illinois will move south into Cook and DuPage counties, the weather service said in a hazardous weather outlook statement.
Visibility in the affected areas will be under a quarter mile, the weather service said. Drivers are advised to reduce speed, use low beams and allow extra travel time.