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Dense Fog Warning: Drive with Caution in West Yellowstone Valley

A Special Weather Statement has been issued for dense fog in the West Yellowstone Valley, reducing visibility and requiring drivers to use headlights until the fog dissipates by late morning.

Staff Writer
09/29/2026 · Madison & Gallatin Region edition

Residents and travelers in the West Yellowstone Valley are advised to exercise extreme caution this morning, Monday, September 29, due to very localized dense fog. The National Weather Service (NWS) in Great Falls, MT, issued a Special Weather Statement at 8:25 AM MDT, indicating visibility is reduced to between a half and a quarter mile at times.

This advisory specifically impacts the West Yellowstone Valley within the Gallatin and Madison County Mountains and Centennial Mountains areas. The NWS anticipates the fog will dissipate by mid to late morning.

If you are driving through the affected area, ensure your headlights are on. This measure is crucial for your visibility to other drivers and for making your vehicle visible on the road.

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