Winter Storm Warning Montana | Effective 03/12/2026 19:01

* WHAT...Heavy snow and blowing snow expected. There is a likelihood of major winter weather impacts to isolated extreme winter storm impacts. Total snow accumulations of 10 to 20 inches for Highway 12 over MacDonald Pass and Georgetown Lake and the higher terrain. Total snow accumulations of 1 to 6 inches at lower elevations. Winds gusts between 40 to 60 mph. * WHERE...Homestake Pass, Georgetown Lake, Highway 12 Garrison to Elliston, Butte, and MacDonald Pass. * WHEN...Until noon MDT Saturday. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. The strong winds and weight of snow on tree limbs may down power lines and could cause sporadic power outages. For MAJOR winter weather impacts, expect considerable disruptions to normal activities. Dangerous or impossible traveling conditions. Avoid travel in the impacted areas if possible. Widespread closures and disruptions to infrastructure may occur. For EXTREME winter storm impacts, expect substantial disruptions to normal activities. Extremely dangerous or impossible traveling conditions. Travel in the impacted areas is not advised. Extensive and widespread closures and disruptions to infrastructure may occur. Life saving actions may be needed. The hazardous conditions could impact the Friday morning and evening commutes, especially over higher passes. Gusty winds could bring down tree branches.