Dense Fog Advisory for portions of the Chicago area until 6PM CST

This is an archived article and the information in the article may be outdated.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 1:20PM CST…

As visibility improves in westernmost portions of the Chicago area, conditions deteriorate in the east. A Dense Fog Advisory continues until 3PM CST for McHenry, DeKalb and Kane counties and until 6PM CST for Lake, DuPage and Cook Counties (grey-shaded area on the headlined map).

The cold front continues to move east across northeast Illinois with visibility improving significantly about one to two hours after the front moves through a given location.

Reference the map below for current visibility across the Chicago area.

_____________________________________________________________________________________________________

A Dense Fog Advisory is in effect until 2PM CST for Winnebago, Boone, McHenry, Ogle, Lee, DeKalb, Kane and LaSalle Counties (gray-shaded counties on the headlined map).

Dense fog has developed over an area along and just east of Interstate-39 in westernmost portions of the Chicago area. Visibility has dropped to less than a quarter-mile in that area, falling to near zero at many locations. If traveling in that area, be prepared for sudden changes to much reduced visibility and slow travel.

A cold front will move slowly east through our area today. Along and ahead of the frontal boundary scattered showers/drizzle will occur with temperatures and dew-points closing to near 100% relative humidity, enabling the fog to develop and persist. Once the front passes a given location, winds will shift to the northwest and the drier air will allow improving visibility.

Below is a map depicting current visibility…

Notice: you are using an outdated browser. Microsoft does not recommend using IE as your default browser. Some features on this website, like video and images, might not work properly. For the best experience, please upgrade your browser.