Patchy Dense Fog overnight across northeast Illinois/northwest Indiana

Fog causes delays on highway and in air

Update 7AM CDT…

A dense Fog Advisory continues in effect until 9AM CDT for a good portion of northeast Illinois away from the city until 9AM. At 7AM CDT conditions were generally on an improving trend with lowest area airport visibility reported at  1/8 mile at Rockford and a quarter-mile at Morris, Peru-Ottawa, Freeport and Aurora.

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With temperature/dew-point spread narrowing a degree or less at most airport locations, wet soils and clearing skies, visibility will drop to less than a half mile – approaching zero in spots overnight, causing difficult/dangerous driving conditions. The early morning commute looks to be very slow in many areas, and individuals should make appropriate plans. Conditions should improve significantly by mid-morning Tuesday.

Below is the map of current visibility in tenths of a mile at area airport locations…