MISSOULA, Mont. – A powerful early fall storm will bring accumulating mountain snow, strong winds, and hazardous travel across western Montana and north-central Idaho through Monday afternoon. Snow is expected to begin Saturday evening, intensifying overnight as cold air deepens over the northern Rockies.
According to the National Weather Service in Missoula, Winter Weather Advisories remain in effect for elevations above 4,000 to 5,500 feet from Saturday evening through midday Monday. The heaviest snow will fall across the Mission, Swan, and Bitterroot ranges, where totals of 8 to 12 inches are likely. Some peaks could top 18 inches. Valleys may see up to two inches, with slushy roads possible early Sunday.
Northeast winds will strengthen overnight Sunday, gusting 35 to 45 mph across mountain passes including MacDonald, Lolo, and Homestake. The combination of snow and wind could cause blowing snow, poor visibility, and isolated power outages from downed limbs, especially in the Lower Clark Fork Region.
Travel impacts are expected on Highways 83, 93, 28, and 200, along with Lookout, Lost Trail, and Bannock passes. The Montana and Idaho Departments of Transportation urge drivers to delay mountain travel if possible, carry emergency gear, and check 511 for updated road reports. Flash freezing may occur late Sunday on I-15 and high passes near Butte and Georgetown Lake.
Residents should prepare for potential power interruptions, secure outdoor items, and protect pets and plants from the cold. Snow will gradually taper late Monday as the system exits east.
