Winter Weather Advisory

* WHAT...Heavy wet snow possible. Total snow accumulations between 4 and 8 inches, with isolated amounts up to 12 inches above 8000 feet. Snow accumulation in the West Yellowstone area and valleys near the Idaho border of up to 2 inches. Winds could gust as high as 45 mph.

* WHERE...Gallatin and Madison County Mountains and Centennial Mountains.

* WHEN...From 6 PM Saturday to 6 AM MDT Monday.

* IMPACTS...Travel could be difficult. Gusty winds combined with the wet and heavy nature of the snow could bring down tree branches. Isolated power outages are possible.

* ADDITIONAL DETAILS...Snowfall amounts will vary drastically from grassy surfaces to roadways, most notably at lower elevations, with accumulations on non-grassy surfaces being confined mainly to between the evening through late morning hours.