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

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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…

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