Dense Fog Advisory in Madison River Valley

Dense Fog Advisory issued October 26 at 12:42AM MDT until October 26 at 12:00PM MDT by NWS Great Falls MT

• Event Start: 2026-10-26T00:42:00-06:00
• Event End: 2026-10-26T12:00:00-06:00
• Event Certainty: Likely
• Event Severity: Moderate

Event Description

• WHAT: Visibility one quarter mile or less in dense fog.
• WHERE: Canyon Ferry Area, Elkhorn and Boulder Mountains, Beaverhead and Western Madison below 6000ft, Gallatin Valley, Gallatin and Madison County Mountains and Centennial Mountains, Madison River Valley, Missouri Headwaters, and Northwest Beaverhead County.
• WHEN: Until noon MDT today.
• IMPACTS: Low visibility could make driving conditions hazardous.

Event Instructions

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.