Active AlertsBeaverhead and Western Madison below 6000ft

What: Variable visibility down to a 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 Monday.
Impacts: Low visibility could make driving conditions hazardous. Frost deposition may cause roads to become slippery, especially over bridges.
Additional Details: Patchy fog is expected to become more widespread and dense tonight into Monday morning.

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