* WHAT...Visibility of one quarter mile or less in dense fog
occurring.

* WHERE...Lake IL, Central Cook, and Northern Cook Counties.

* WHEN...Until 6 AM CST Friday.

* IMPACTS...Low visibility could make driving conditions hazardous.

* ADDITIONAL DETAILS...The densest fog is currently occurring near
the Lake Michigan shore, but is expected to gradually expand
inland overnight.

WWUS73 KLOT 060504
NPWLOT

Dense Fog Advisory
National Weather Service Chicago IL
1104 PM CST Thu Mar 5 2026
ILZ006-103-104
/O.CON.KLOT.FG.Y.0007.000000T0000Z-260306T1200Z/
Lake-Northern Cook-Central Cook

...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 6 AM CST FRIDAY...

* WHAT...Visibility of one quarter mile or less in dense fog
occurring.

* WHERE...Lake IL, Central Cook, and Northern Cook Counties.

* WHEN...Until 6 AM CST Friday.

* IMPACTS...Low visibility could make driving conditions hazardous.

* ADDITIONAL DETAILS...The densest fog is currently occurring near
the Lake Michigan shore, but is expected to gradually expand
inland overnight.
If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.

Local Weather

Chicago, Illinois, US