Alert archive / Montana / Severe Thunderstorm Warnings / 2025
Severe Thunderstorm Warnings in Montana, May 2025
33 severe thunderstorm warnings in May 2025. 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 May 2025. Tap one for its archive.
- Severe Thunderstorm Warnings
- 33
- Busiest day
- May 11, 202515 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 |
|---|---|---|---|---|
| May 10, 3:05 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 55 min |
| May 10, 3:53 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 52 min |
| May 10, 4:00 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Jefferson, Lewis and Clark | 60 min |
| May 10, 5:07 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Hill | 68 min |
| May 10, 5:17 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Fergus | 58 min |
| May 10, 5:21 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Fergus, Judith Basin | 54 min |
| May 10, 5:48 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 57 min |
| May 10, 5:59 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 61 min |
| May 10, 6:13 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Fergus | 62 min |
| May 10, 6:31 PM MDT | Severe Thunderstorm Warning | TFX | Fergus, Judith Basin | 59 min |
| May 10, 6:41 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 27 min |
| May 10, 6:57 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum, Phillips | 63 min |
| May 10, 7:05 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau | 55 min |
| May 10, 7:21 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 24 min |
| May 10, 7:42 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 37 min |
| May 10, 7:50 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Petroleum, Phillips, Valley | 55 min |
| May 10, 8:43 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Garfield, McCone, Roosevelt, Valley | 25 min |
| May 10, 10:22 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 23 min |
| May 10, 10:44 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 61 min |
| May 11, 2:44 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Pondera, Teton | 46 min |
| May 11, 3:27 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Fergus, Hill, Judith Basin, Teton | 63 min |
| May 11, 4:27 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Fergus, Hill | 93 min |
| May 11, 5:56 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Fergus, Hill | 58 min |
| May 11, 6:01 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 29 min |
| May 11, 6:12 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 48 min |
| May 11, 6:21 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 54 min |
| May 11, 6:44 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 31 min |
| May 11, 6:58 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Wibaux | 62 min |
| May 11, 7:01 PM MDT | Severe Thunderstorm Warning | MSO | Sanders | 44 min |
| May 12, 12:27 AM MDT | Severe Thunderstorm Warning | MSO | Flathead | 48 min |
| May 12, 4:06 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 34 min |
| May 12, 8:24 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Garfield, McCone, Richland, Roosevelt, Valley | 66 min |
| May 12, 8:27 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 63 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Blaine County10
- Chouteau County9
- Fergus County8
- Hill County7
- Garfield County5
- Valley County5
- Cascade County4
- Phillips County4
- Judith Basin County3
- McCone County3
- Custer County3
- Petroleum County2
- Roosevelt County2
- Teton County2
- Dawson County2
- Broadwater County1
- Jefferson County1
- Lewis and Clark County1
- Daniels County1
- Pondera County1
- Rosebud County1
- Prairie County1
- Wibaux County1
- Sanders County1
- Flathead County1
- Richland County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive20242026
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.