Montana, 2011Heavy Snow in Montana, December 20 to 21, 2011
December 20 to 21, 2011 · NWS MSO · 4 events in 2 counties and zones
A Pacific storm moved across western Montana and brought widespread snowfall. Reported storm totals were from 2 inches to 5 inches.
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.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
Open the live radar over this ground
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 4
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.
A Pacific storm moved across western Montana and brought widespread snowfall. Reported storm totals were from 2 inches to 5 inches.
Heavy Snow, Flathead/Mission Valleys
- When
- December 20, 11:00 PM MST to December 21, 7:16 AM MST
- Where
- Flathead/Mission Valleys forecast zone
- Reported by
- Trained Spotter
- Coordinates
- 47.872, -114.424 (the zone’s center; the record gives no point)
A spotter measured 5.2 inches of snow 4 miles northeast of Ronan.
Heavy Snow, Missoula / Bitterroot Valleys
- When
- December 21, 1:00 AM MST to 7:16 AM MST
- Where
- Missoula / Bitterroot Valleys forecast zone
- Reported by
- Trained Spotter
- Coordinates
- 46.560, -114.023 (the zone’s center; the record gives no point)
A spotter measured 3.5 inches of snow in Evaro.
Heavy Snow, Flathead/Mission Valleys
- When
- December 21, 1:00 AM MST to 7:16 AM MST
- Where
- Flathead/Mission Valleys forecast zone
- Reported by
- Trained Spotter
- Coordinates
- 47.872, -114.424 (the zone’s center; the record gives no point)
A spotter measured 3.3 inches of snow 3 miles north-northeast of Bigfork.
Heavy Snow, Flathead/Mission Valleys
- When
- December 21, 1:00 AM MST to 7:45 AM MST
- Where
- Flathead/Mission Valleys forecast zone
- Reported by
- Public
- Coordinates
- 47.872, -114.424 (the zone’s center; the record gives no point)
The public measured 4.5 inches of snow 12 miles northeast of Polson.
- Heavy Snow
- Snowfall reaching the local warning threshold without the other hazards of a winter storm.
After NWS Directive 10-1605, the rules offices file Storm Data by.
- Tornado in Louisiana, December 20, 2011$500,000 · EF1 · 1 event
- Blizzard and Heavy Snow in Alaska, December 20 to 21, 201173 kt wind · 5 events
- Winter Weather in Montana, December 20 to 21, 20114 events
- High Wind in Montana, December 20, 201151 kt wind · 3 events
- Damaging Wind and Heavy Rain in Alabama, December 20 to 22, 201152 kt wind · 3 events
- Winter Storm in Montana, December 20 to 21, 20113 events
- Heavy Rain in Florida, December 20 to 21, 20112 events
- Winter Storm in Montana, December 20 to 21, 20112 events
- High Wind in Montana, December 20, 20111 event
- Heavy Rain in Georgia, December 20 to 21, 20111 event
- Blizzard in Alaska, December 20 to 21, 20111 event
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 2026-09-30. Each event’s entry at NCEI: 356340, 356341, 356342, 356352.