Strong winds across Montana this weekend By: Mike Heard and last updated 2020-12-18 16:45:31-05 UPDATE: The National Weather Service has issued a WIND ADVISORY for the Butte-Blackfoot region from 5 am to 5 pm Saturday. Sustained winds 20 to 30 mph and gusts up to or over 50 mph are possible. Areas impacted: Anaconda, Georgetown Lake, MacDonald Pass, and around Avon, Garrison to Elliston. Property damage is possible along with downed trees and power outages. BOZEMAN â The greatest weather hazard this weekend will be strong gusty winds across Montana. High wind prone areas along the Rocky mountain front, upper Yellowstone and hi-line region could see a long duration high wind event beginning Friday evening and continuing through Sunday evening.