Alert archive / Montana / Severe Thunderstorm Warnings / 2026
Severe Thunderstorm Warnings in Montana, August 2026
58 severe thunderstorm warnings in August 2026. 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 severe thunderstorm warnings reaches back to 1986.
Severe Thunderstorm Warnings by county
Each county as a circle sized by its count in August 2026. Tap one for its archive.
- Severe Thunderstorm Warnings
- 58
- Busiest day
- August 18, 202613 severe thunderstorm 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 |
|---|---|---|---|---|
| Aug 11, 3:49 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Fallon | 56 min |
| Aug 11, 4:04 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 41 min |
| Aug 11, 5:13 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 32 min |
| Aug 12, 6:19 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 56 min |
| Aug 14, 4:08 PM MDT | Severe Thunderstorm Warning | MSO | Mineral, Missoula, Sanders | 22 min |
| Aug 14, 4:30 PM MDT | Severe Thunderstorm Warning | MSO | Missoula, Sanders | 45 min |
| Aug 14, 5:14 PM MDT | Severe Thunderstorm Warning | MSO | Missoula | 26 min |
| Aug 14, 7:08 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Gallatin | 67 min |
| Aug 15, 5:53 PM MDT | Severe Thunderstorm Warning | BYZ | Wheatland | 52 min |
| Aug 16, 5:44 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 39 min |
| Aug 16, 6:25 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 65 min |
| Aug 17, 2:21 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark | 39 min |
| Aug 17, 2:23 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Wheatland | 37 min |
| Aug 17, 3:42 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Phillips, Valley | 63 min |
| Aug 17, 3:47 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Teton | 43 min |
| Aug 17, 4:44 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 61 min |
| Aug 17, 5:16 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 44 min |
| Aug 17, 5:46 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Prairie | 59 min |
| Aug 17, 6:25 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 50 min |
| Aug 17, 6:41 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 49 min |
| Aug 17, 7:03 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 42 min |
| Aug 18, 1:20 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 25 min |
| Aug 18, 1:28 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 62 min |
| Aug 18, 1:32 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 43 min |
| Aug 18, 2:12 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 63 min |
| Aug 18, 2:28 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum | 62 min |
| Aug 18, 3:04 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 56 min |
| Aug 18, 3:07 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell, Rosebud | 38 min |
| Aug 18, 3:42 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud, Treasure | 24 min |
| Aug 18, 3:52 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 38 min |
| Aug 18, 4:27 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 21 min |
| Aug 18, 6:20 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum, Phillips | 55 min |
| Aug 18, 6:57 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 33 min |
| Aug 22, 5:27 PM MDT | Severe Thunderstorm Warning | MSO | Flathead, Lincoln | 48 min |
| Aug 23, 2:41 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin, Madison | 64 min |
| Aug 23, 2:43 PM MDT | Severe Thunderstorm Warning | TFX | Hill, Liberty | 62 min |
| Aug 23, 2:51 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 54 min |
| Aug 23, 3:33 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Hill | 57 min |
| Aug 23, 3:40 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 36 min |
| Aug 23, 3:44 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 91 min |
| Aug 23, 3:45 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum, Phillips | 60 min |
| Aug 23, 5:20 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 55 min |
| Aug 23, 6:04 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 56 min |
| Aug 23, 6:40 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 21 min |
| Aug 23, 6:59 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Garfield, McCone, Roosevelt, Valley | 61 min |
| Aug 23, 7:27 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum | 63 min |
| Aug 23, 8:02 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Sheridan | 58 min |
| Aug 23, 8:53 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Sheridan | 67 min |
| Aug 25, 2:51 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin | 16 min |
| Aug 27, 5:11 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Yellowstone | 49 min |
| Aug 27, 5:21 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Judith Basin, Meagher, Teton | 54 min |
| Aug 27, 6:51 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Fergus, Hill | 54 min |
| Aug 27, 7:42 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Fergus, Hill | 54 min |
| Aug 29, 5:42 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 67 min |
| Aug 30, 12:40 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Garfield, McCone, Prairie | 65 min |
| Aug 30, 1:42 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 33 min |
| Aug 30, 2:05 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 40 min |
| Aug 30, 2:41 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 37 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Garfield County8
- Rosebud County7
- Blaine County6
- Phillips County6
- Custer County6
- Petroleum County6
- Hill County6
- Carter County5
- Chouteau County5
- Valley County4
- Fergus County4
- McCone County3
- Prairie County3
- Missoula County3
- Gallatin County3
- Cascade County3
- Daniels County3
- Dawson County2
- Sanders County2
- Wheatland County2
- Teton County2
- Roosevelt County2
- Sheridan County2
- Powder River County2
- Fallon County1
- Mineral County1
- Broadwater County1
- Lewis and Clark County1
- Golden Valley County1
- Musselshell County1
- Treasure County1
- Flathead County1
- Lincoln County1
- Madison County1
- Liberty County1
- Big Horn County1
- Yellowstone County1
- Judith Basin County1
- Meagher County1
Nearby
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.