Dense Fog Advisory 03/04/2026 04:52 Illinois

Headline: 
Dense Fog Advisory issued March 4 at 6:52AM CST until March 4 at 9:00AM CST by NWS Chicago IL
Event: 
Dense Fog Advisory
Urgency: 
Expected
Effective: 
March 4, 2026 - 4:52am
Expires: 
March 4, 2026 - 7:00am
Description: 
* WHAT...Visibility one quarter mile or less in areas of dense fog. * WHERE...Boone, De Kalb, Lee, Ogle, Winnebago, Kane, Lake IL, McHenry, and Northern Cook Counties. * WHEN...Until 9 AM CST this morning. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Patchy slick spots may be encountered on untreated elevated surfaces where temperatures are still at or below freezing in far northeastern Illinois.
Instruction: 
If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Area Description: 
Winnebago; Boone; McHenry; Lake; Ogle; Lee; De Kalb; Kane; Northern Cook
Forcast Office: 
NWS Chicago IL
Sender: 
w-nws.webmaster@noaa.gov