Alert archive / Montana / Winter Storm Warnings / 2021
Winter Storm Warnings in Montana, December 2021
11 winter storm warnings in December 2021. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of winter storm warnings reaches back to 2005.
Winter Storm Warnings by county
Each county as a circle sized by its count in December 2021. Tap one for its archive.
- Winter Storm Warnings
- 11
- Busiest day
- December 10, 20212 winter storm warnings
Over time
By day
Days in UTC, the clock the archive keeps.
The alerts
Every alert, in the order issued. Times are local, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 3, 2:56 AM MST | Winter Storm Warning | GGW | Daniels, Phillips, Roosevelt, Sheridan, Valley | 48 hr |
| Dec 10, 2:19 AM MST | Winter Storm Warning | TFX | 15 hr | |
| Dec 10, 3:01 PM MST | Winter Storm Warning | MSO | Flathead, Granite, Lake, Lincoln, Mineral, Missoula and 2 more | 53 hr |
| Dec 11, 7:10 PM MST | Winter Storm Warning | TFX | 16 hr | |
| Dec 13, 1:58 PM MST | Winter Storm Warning | TFX | 39 hr | |
| Dec 14, 7:40 AM MST | Winter Storm Warning | MSO | Deer Lodge, Granite, Powell, Silver Bow | 14 hr |
| Dec 17, 1:20 PM MST | Winter Storm Warning | MSO | Deer Lodge, Flathead, Granite, Lake, Lincoln, Mineral and 5 more | 64 hr |
| Dec 18, 3:08 AM MST | Winter Storm Warning | TFX | 35 hr | |
| Dec 20, 7:33 AM MST | Winter Storm Warning | MSO | Missoula, Ravalli | 3 hr |
| Dec 22, 1:52 PM MST | Winter Storm Warning | BYZ | Carbon, Park, Stillwater, Sweet Grass | 54 hr |
| Dec 24, 12:32 PM MST | Winter Storm Warning | MSO | Flathead, Lake | 22 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Flathead County3
- Granite County3
- Lake County3
- Missoula County3
- Ravalli County3
- Lincoln County2
- Mineral County2
- Sanders County2
- Deer Lodge County2
- Powell County2
- Silver Bow County2
- Daniels County1
- Phillips County1
- Roosevelt County1
- Sheridan County1
- Valley County1
- Carbon County1
- Park County1
- Stillwater County1
- Sweet Grass County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive20202022
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.