Dense Fog Advisory Montana | Effective 03/21/2026 23:43

Headline: 
Dense Fog Advisory issued March 22 at 12:43AM MDT until March 22 at 9:00AM MDT by NWS Great Falls MT
Event: 
Dense Fog Advisory
Urgency: 
Expected
Effective: 
March 21, 2026 - 11:43pm
Expires: 
March 22, 2026 - 8:00am
Description: 
* WHAT...Visibility a quarter of a mile or less at times in dense fog. * WHERE...Fergus County below 4500ft and Judith Basin County and Judith Gap. * WHEN...Until 9 AM MDT this morning. * 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: 
Judith Basin County and Judith Gap; Fergus County below 4500ft
Forcast Office: 
NWS Great Falls MT