AVALANCHE WARNING: West Central Montana, Missoula Area Dangerous avalanche conditions exist in Montana's western mountain ranges: The southern Swan, southern Missions, Rattlesnake and the central and southern Bitterroot Mountains The West Central Montana advisory area covers approximately 908,721 acres and is comprised of regions on the Bitterroot, Lolo and Nez Perce-Clearwater National Forests. Please use extreme caution while traveling in the back country, especially while this Avalanche Warning is in effect. Affected Area...The southern Swan, southern Missions, Rattlesnake and the central and southern Bitterroot Mountains. Avalanche Danger... The avalanche danger is HIGH. Reason/Impacts of this Avalanche Warning...New heavy snow, warm temperatures, rain and strong winds are creating very dangerous avalanche conditions.