* WHAT...Snow and blowing snow occurring. Additional snow accumulations up to 6 inches with locally higher amounts possible. Winds gusting as high as 45 mph. * WHERE...In Montana, Pryor/Northern Bighorn Mountains. In Wyoming, Northeast Bighorn Mountains. * WHEN...Until 8 PM MST this evening. * IMPACTS...Snow and blowing snow will make back country recreation and travel along Highway 14 through the Bighorn Mountains very difficult. Visibilities may drop below 1/4 mile due to falling and blowing snow. * ADDITIONAL DETAILS...Snowfall will diminish through this afternoon.