CHICAGO — The National Weather Service in Chicago has issued a dense fog advisory, which is in effect until 10 a.m. Tuesday.
Visibility is expected to drop to 1/4 mile or less at times as dense fog moves through the Chicago area. Expect the lowest visibility in low-lying rural areas.
Poor and rapidly changing visibility can make travel hazardous. If driving, slow down and use your headlights. Leave plenty of distance ahead of you.
Impacted counties: Winnebago, Boone, McHenry, Lake in Illinois, Ogle, Lee, DeKalb, Kane, DuPage, Cook,
Kendall, Grundy, Will, Kankakee, and Lake in Indiana.