A winter storm, moving across the international border, brought light accumulations of wet snow to most locations across northeast Montana.
Every event with a place to put it; 4 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 GGW wrote it up.
A winter storm, moving across the international border, brought light accumulations of wet snow to most locations across northeast Montana.
The national radar mosaic for the moment the first event began.
4 winter weather. Local standard time, as filed.
Weather spotters and cooperative observers reported 2 to 4 inches of new snowfall across the county. The highest amount of 4 inches was reported at the Port of Morgan border station.
NWS employees, weather spotters and cooperative observers reported 1 to 3.7 inches of new snowfall across the county. The highest amount of 3.7 inches was reported at the Hinsdale 4SW COOP site.
Weather spotters and cooperative observers reported 1 to 2 inches of new snowfall across the county. The highest amount of 2 inches was reported at the Circle COOP site.
Cooperative observers reported 2 inches of new snowfall at both the Wibaux 2E and Carlyle 13W COOP sites.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2011Every state in 2011This day in weather historyWarnings in Montana, December 2011
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: 357710, 357711, 357712, 357713.