A strong Arctic front pushed across the Continental Divide and brought heavy snow, blowing and drifting snow at most of the mountain passes.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS MSO wrote it up.
A strong Arctic front pushed across the Continental Divide and brought heavy snow, blowing and drifting snow at most of the mountain passes.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Missoula, MT wrote its last area forecast discussion before the first event at Nov 7, 2:42 PM MST, 8 hours 18 minutes earlier.
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</html>The national radar mosaic for the moment the first event began.
1 winter storm. Local standard time, as filed.
Severe driving conditions were declared for Homestake Pass, from Avon to MacDonald Pass along US-12, and Avon to Nevada Lake along HWY-141 at 11 pm on the 7th. Chains were required for towing units on Homestake Pass at 11:45 pm on the 7th.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2020Every state in 2020This day in weather historyWarnings in Montana, November 2020
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 927063.