Dense Fog Advisory 
A Dense Fog Advisory is in effect for the City of St. Louis until 9 AM Friday, 1/31/2025.
* WHAT...Visibility of one-quarter mile or less in dense fog.
* WHERE...Portions of south-central, southwest, and west-central Illinois and central, east-central, northeast, and southeast Missouri.
* WHEN...Until 9 AM CST Friday (1/31/2025).
* IMPACTS...Low visibility could make driving conditions hazardous.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Address/Location
City of St. Louis Emergency Management
1915 Olive St
St. Louis, MO 63103
Contact
Emergency: 9-1-1