DENSE FOG ADVISORY until noon for northwest Montana, including the Flathead and Mission Valleys west to the Idaho border.  Visibilities will be cut to less than a quarter of a mile.  Caution is advised.  Black ice may also form as moisture condenses to some roadways.

Locations impacted: Kalispell, Libby, Eureka, West Glacier, Polson, St. Ignatius, Arlee, Evaro, Thompson Falls, Plains, Superior, St. Regis, Frenchtown, Lookout and Lolo Passes.