The Dense Fog Advisory across the Chicago area has been discontinued

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.

Update 9PM CST…

The Dense Fog Advisory has been dropped. Very strong south to southwest winds gusting to 40 miles per hour have so “mixed” the air close to the ground that visibility has lifted significantly in the past couple hours (see current visibility map below).  With winds this strong, fog is no longer a threat.


A Dense Fog Advisory calling for frequent visibility less than a quarter-mile in fog will be in effect for most of northeast Illinois and northwest Indiana until 10PM CST this Wednesday evening. Strong south to southwest winds gusting over 25 miles per hour will continue to feed mild relatively high dew-point air over a thinning, but still considerably snow-covered and moist surface, resulting in nearly 100 per cent relative humidity and extensive dense fog. Visibility may improve some later tonight.

Latest visibility reports…