Illinois Dense Fog Advisory | Effective 04/16/2026 21:52

Headline: 
Dense Fog Advisory issued April 16 at 11:52PM CDT until April 17 at 10:00AM CDT by NWS Chicago IL
Event: 
Dense Fog Advisory
Urgency: 
Expected
Effective: 
April 16, 2026 - 9:52pm
Expires: 
April 17, 2026 - 8:00am
Description: 
* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Central Cook, Eastern Will, and Northern Will Counties. * WHEN...Until 10 AM CDT Friday. * IMPACTS...Low visibility could make driving conditions hazardous.
Instruction: 
If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Area Description: 
Central Cook; Northern Will; Eastern Will
Forcast Office: 
NWS Chicago IL