Alert archive / Montana / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in Montana, 2023
230 severe thunderstorm warnings in 2023. 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 2023. Tap one for its archive.
- Severe Thunderstorm Warnings
- 230
- Busiest month
- July81 severe thunderstorm warnings
- Busiest day
- July 30, 202318 severe thunderstorm warnings
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
74 of 230 severe thunderstorm warnings covering Montana in 2023 had a qualifying storm report inside them; 131 of 250 hail, wind and damage reports fell inside a warning, on average 24 minutes after it went out.
Montana, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Severe thunderstorm warnings | 230 | 74 | 68% | 250 | 52% | 24 min |
Each office's whole area, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Glasgow, MT: severe thunderstorm warnings | 73 | 26 | 64% | 69 | 74% | 33 min |
| NWS Great Falls, MT: severe thunderstorm warnings | 64 | 25 | 61% | 84 | 48% | 15 min |
| NWS Billings, MT: severe thunderstorm warnings | 85 | 22 | 74% | 85 | 48% | 22 min |
| NWS Missoula, MT: severe thunderstorm warnings | 13 | 3 | 77% | 25 | 20% | 10 min |
An office's figures cover every county it serves, including across state lines.
Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.
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 7, 2:54 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 36 min |
| May 7, 3:42 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 33 min |
| May 7, 4:50 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 40 min |
| May 21, 4:45 PM MDT | Severe Thunderstorm Warning | MSO | Mineral, Sanders | 30 min |
| May 22, 12:06 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 24 min |
| May 22, 12:19 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 41 min |
| May 22, 12:58 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark, Teton | 47 min |
| May 22, 4:30 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 49 min |
| May 22, 4:48 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 27 min |
| May 22, 6:25 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum, Phillips | 31 min |
| May 23, 4:07 PM MDT | Severe Thunderstorm Warning | BYZ | Sweet Grass | 53 min |
| May 23, 7:09 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 51 min |
| May 24, 3:33 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 44 min |
| May 24, 3:36 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 54 min |
| May 24, 4:26 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Valley | 37 min |
| May 24, 4:37 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Valley | 53 min |
| May 24, 5:48 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 26 min |
| May 24, 6:29 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 31 min |
| May 24, 6:30 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 30 min |
| May 24, 7:05 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 55 min |
| May 25, 4:23 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 37 min |
| May 25, 5:02 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 43 min |
| May 25, 5:25 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Musselshell | 50 min |
| May 25, 5:27 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin | 33 min |
| May 25, 6:12 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 30 min |
| May 25, 7:14 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum, Phillips | 61 min |
| May 25, 7:35 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 38 min |
| May 25, 7:49 PM MDT | Severe Thunderstorm Warning | GGW | Dawson | 56 min |
| May 25, 8:09 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 41 min |
| May 25, 8:17 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland, Wibaux | 58 min |
| May 26, 3:24 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 51 min |
| May 26, 4:09 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 66 min |
| May 26, 5:14 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 46 min |
| May 26, 6:02 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 43 min |
| May 26, 7:00 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Treasure | 60 min |
| May 26, 7:59 PM MDT | Severe Thunderstorm Warning | BYZ | Treasure, Yellowstone | 31 min |
| May 27, 4:38 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 37 min |
| May 27, 4:42 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum, Phillips | 63 min |
| May 27, 5:01 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Fallon | 41 min |
| May 27, 5:05 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Richland, Wibaux | 55 min |
| May 27, 5:42 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum, Phillips, Valley | 63 min |
| May 27, 6:01 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Wibaux | 59 min |
| May 27, 6:20 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 37 min |
| May 27, 6:23 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 67 min |
| May 28, 5:34 PM MDT | Severe Thunderstorm Warning | GGW | Dawson | 17 min |
| Jun 1, 2:20 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 40 min |
| Jun 1, 2:59 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 46 min |
| Jun 1, 7:42 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 33 min |
| Jun 1, 8:16 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 29 min |
| Jun 1, 8:29 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Valley | 30 min |
| Jun 1, 10:49 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Sheridan | 56 min |
| Jun 2, 6:23 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 52 min |
| Jun 4, 5:21 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Garfield, McCone, Prairie, Richland, Roosevelt and 2 more | 28 min |
| Jun 5, 1:40 PM MDT | Severe Thunderstorm Warning | TFX | Hill | 23 min |
| Jun 5, 1:44 PM MDT | Severe Thunderstorm Warning | TFX | Judith Basin | 30 min |
| Jun 5, 2:00 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Fergus | 31 min |
| Jun 5, 7:19 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 30 min |
| Jun 5, 9:42 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Fergus | 48 min |
| Jun 6, 1:19 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 28 min |
| Jun 6, 1:29 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 61 min |
| Jun 6, 2:07 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 53 min |
| Jun 6, 2:55 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 65 min |
| Jun 6, 7:53 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 52 min |
| Jun 7, 2:02 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 27 min |
| Jun 7, 3:59 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 29 min |
| Jun 7, 4:31 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 28 min |
| Jun 7, 5:01 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Phillips, Valley | 41 min |
| Jun 7, 6:16 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 32 min |
| Jun 8, 5:03 PM MDT | Severe Thunderstorm Warning | GGW | Wibaux | 57 min |
| Jun 8, 6:25 PM MDT | Severe Thunderstorm Warning | GGW | Dawson | 65 min |
| Jun 8, 6:45 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland | 37 min |
| Jun 8, 7:08 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Prairie | 47 min |
| Jun 9, 5:57 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Wibaux | 25 min |
| Jun 19, 6:39 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 66 min |
| Jun 19, 7:22 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 22 min |
| Jun 19, 7:43 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Fallon | 62 min |
| Jun 19, 8:28 PM MDT | Severe Thunderstorm Warning | GGW | Prairie, Wibaux | 47 min |
| Jun 19, 8:44 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 31 min |
| Jun 19, 10:41 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 49 min |
| Jun 19, 10:47 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 43 min |
| Jun 19, 11:27 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 63 min |
| Jun 19, 11:42 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 33 min |
| Jun 20, 12:08 AM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Prairie | 37 min |
| Jun 20, 12:23 AM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 52 min |
| Jun 20, 1:06 AM MDT | Severe Thunderstorm Warning | BYZ | Custer | 39 min |
| Jun 20, 1:11 AM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie | 64 min |
| Jun 23, 3:37 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 38 min |
| Jun 23, 4:08 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 29 min |
| Jun 23, 5:50 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 70 min |
| Jun 23, 6:30 PM MDT | Severe Thunderstorm Warning | TFX | Pondera, Teton | 30 min |
| Jun 26, 4:00 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Fallon | 60 min |
| Jun 26, 4:33 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 27 min |
| Jun 26, 4:55 PM MDT | Severe Thunderstorm Warning | TFX | Meagher | 35 min |
| Jun 26, 7:14 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 31 min |
| Jun 26, 8:21 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 39 min |
| Jun 26, 10:29 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 32 min |
| Jun 27, 2:09 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 51 min |
| Jun 27, 2:34 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 20 min |
| Jul 1, 12:48 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Cascade, Jefferson, Lewis and Clark, Meagher | 27 min |
| Jul 1, 1:21 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Meagher | 24 min |
| Jul 1, 3:02 PM MDT | Severe Thunderstorm Warning | BYZ | Park, Stillwater, Sweet Grass | 58 min |
| Jul 1, 3:02 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead, Gallatin, Madison | 58 min |
| Jul 2, 9:49 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 33 min |
| Jul 2, 11:36 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 29 min |
| Jul 6, 12:49 PM MDT | Severe Thunderstorm Warning | TFX | Jefferson | 26 min |
| Jul 10, 4:04 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Jefferson | 41 min |
| Jul 10, 5:50 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Teton | 40 min |
| Jul 10, 6:02 PM MDT | Severe Thunderstorm Warning | MSO | Lake, Missoula | 13 min |
| Jul 10, 9:37 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 23 min |
| Jul 11, 1:35 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell, Rosebud, Treasure, Yellowstone | 40 min |
| Jul 11, 2:08 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Phillips, Valley | 67 min |
| Jul 11, 2:13 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 47 min |
| Jul 11, 2:37 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt | 53 min |
| Jul 11, 2:56 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 17 min |
| Jul 11, 3:13 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Valley | 37 min |
| Jul 11, 3:20 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 55 min |
| Jul 11, 3:25 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt | 65 min |
| Jul 11, 4:00 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Prairie | 60 min |
| Jul 11, 4:41 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Wibaux | 64 min |
| Jul 11, 5:23 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 67 min |
| Jul 11, 5:28 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 47 min |
| Jul 11, 5:44 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Wibaux | 30 min |
| Jul 11, 5:49 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 24 min |
| Jul 11, 7:37 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 38 min |
| Jul 11, 7:39 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 36 min |
| Jul 11, 7:49 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 26 min |
| Jul 11, 7:58 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 62 min |
| Jul 11, 8:13 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 47 min |
| Jul 11, 8:14 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 31 min |
| Jul 11, 8:15 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 45 min |
| Jul 11, 9:44 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Fallon | 20 min |
| Jul 13, 5:16 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Garfield, McCone, Prairie | 59 min |
| Jul 17, 10:39 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Valley | 49 min |
| Jul 18, 2:43 AM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 47 min |
| Jul 22, 9:29 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Valley | 61 min |
| Jul 22, 10:25 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, McCone, Richland, Roosevelt, Sheridan, Valley | 65 min |
| Jul 22, 11:24 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt, Sheridan | 66 min |
| Jul 25, 4:54 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Valley | 36 min |
| Jul 27, 4:19 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Powell | 16 min |
| Jul 27, 5:12 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 33 min |
| Jul 28, 4:23 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin | 22 min |
| Jul 28, 4:33 PM MDT | Severe Thunderstorm Warning | BYZ | Park, Sweet Grass, Wheatland | 42 min |
| Jul 28, 4:58 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin | 32 min |
| Jul 28, 5:23 PM MDT | Severe Thunderstorm Warning | TFX | Meagher | 22 min |
| Jul 28, 5:45 PM MDT | Severe Thunderstorm Warning | BYZ | Wheatland | 45 min |
| Jul 28, 5:53 PM MDT | Severe Thunderstorm Warning | TFX | Judith Basin, Meagher | 22 min |
| Jul 28, 7:10 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon | 50 min |
| Jul 28, 7:53 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum, Phillips | 40 min |
| Jul 29, 6:51 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Judith Basin | 24 min |
| Jul 29, 7:14 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Fergus, Judith Basin | 46 min |
| Jul 29, 8:22 PM MDT | Severe Thunderstorm Warning | TFX | Glacier, Toole | 38 min |
| Jul 29, 8:51 PM MDT | Severe Thunderstorm Warning | TFX | Fergus, Judith Basin | 24 min |
| Jul 29, 9:15 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 30 min |
| Jul 29, 9:25 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum | 30 min |
| Jul 29, 10:36 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum | 54 min |
| Jul 29, 11:27 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell, Rosebud | 33 min |
| Jul 29, 11:59 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 23 min |
| Jul 30, 2:15 AM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Valley | 35 min |
| Jul 30, 3:23 AM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Sheridan | 45 min |
| Jul 30, 4:28 AM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt, Sheridan | 50 min |
| Jul 30, 2:10 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 54 min |
| Jul 30, 2:36 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 29 min |
| Jul 30, 3:49 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Valley | 56 min |
| Jul 30, 4:38 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Roosevelt, Valley | 67 min |
| Jul 30, 4:40 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 35 min |
| Jul 30, 5:43 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland, Roosevelt | 62 min |
| Jul 30, 6:35 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland, Wibaux | 70 min |
| Jul 30, 7:04 PM MDT | Severe Thunderstorm Warning | TFX | Hill | 26 min |
| Jul 30, 7:29 PM MDT | Severe Thunderstorm Warning | TFX | Hill | 31 min |
| Jul 30, 7:59 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Judith Basin | 46 min |
| Jul 30, 8:00 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 30 min |
| Jul 30, 8:16 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Fergus, Judith Basin | 44 min |
| Jul 30, 8:25 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 50 min |
| Jul 30, 8:42 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Fergus, Judith Basin | 48 min |
| Jul 30, 8:56 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Fergus | 49 min |
| Jul 30, 9:13 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 47 min |
| Jul 30, 9:22 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Hill | 38 min |
| Jul 30, 10:54 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 66 min |
| Jul 30, 11:42 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Roosevelt, Valley | 63 min |
| Jul 31, 8:04 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 41 min |
| Jul 31, 9:38 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 22 min |
| Aug 1, 2:57 AM MDT | Severe Thunderstorm Warning | GGW | Phillips | 63 min |
| Aug 1, 3:53 AM MDT | Severe Thunderstorm Warning | GGW | Valley | 67 min |
| Aug 1, 4:59 AM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Valley | 61 min |
| Aug 1, 4:23 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland, Roosevelt | 56 min |
| Aug 6, 5:59 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater | 31 min |
| Aug 6, 6:28 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater | 32 min |
| Aug 18, 2:47 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead, Madison | 43 min |
| Aug 18, 3:09 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Jefferson, Lewis and Clark, Meagher | 51 min |
| Aug 18, 3:50 PM MDT | Severe Thunderstorm Warning | TFX | Meagher | 40 min |
| Aug 18, 4:47 PM MDT | Severe Thunderstorm Warning | TFX | Fergus, Judith Basin | 43 min |
| Aug 18, 6:13 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 36 min |
| Aug 18, 8:02 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Valley | 58 min |
| Aug 21, 11:08 PM MDT | Severe Thunderstorm Warning | BYZ | Treasure, Yellowstone | 37 min |
| Aug 21, 11:38 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 52 min |
| Aug 22, 12:03 AM MDT | Severe Thunderstorm Warning | GGW | Garfield | 57 min |
| Aug 22, 4:22 PM MDT | Severe Thunderstorm Warning | MSO | Flathead | 23 min |
| Aug 22, 4:42 PM MDT | Severe Thunderstorm Warning | MSO | Flathead | 48 min |
| Aug 22, 5:02 PM MDT | Severe Thunderstorm Warning | MSO | Missoula | 28 min |
| Aug 22, 5:27 PM MDT | Severe Thunderstorm Warning | TFX | Hill | 33 min |
| Aug 22, 6:29 PM MDT | Severe Thunderstorm Warning | TFX | Glacier, Pondera | 31 min |
| Aug 22, 6:56 PM MDT | Severe Thunderstorm Warning | TFX | Glacier, Pondera | 34 min |
| Aug 22, 7:26 PM MDT | Severe Thunderstorm Warning | TFX | Glacier, Toole | 34 min |
| Aug 22, 8:12 PM MDT | Severe Thunderstorm Warning | TFX | Toole | 33 min |
| Aug 22, 11:40 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland, Wibaux | 35 min |
| Aug 25, 7:48 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead | 27 min |
| Aug 29, 3:54 PM MDT | Severe Thunderstorm Warning | MSO | Mineral, Sanders | 36 min |
| Aug 29, 3:59 PM MDT | Severe Thunderstorm Warning | MSO | Mineral, Missoula | 46 min |
| Aug 29, 5:10 PM MDT | Severe Thunderstorm Warning | MSO | Mineral, Missoula, Ravalli | 35 min |
| Aug 29, 5:28 PM MDT | Severe Thunderstorm Warning | MSO | Mineral, Missoula | 32 min |
| Aug 29, 6:15 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark, Teton | 45 min |
| Aug 29, 6:27 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead, Madison | 33 min |
| Aug 29, 6:52 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Teton | 38 min |
| Aug 29, 7:03 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead, Madison | 42 min |
| Aug 29, 7:32 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Liberty, Pondera, Teton | 43 min |
| Aug 29, 8:08 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 37 min |
| Aug 29, 8:18 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead, Broadwater, Gallatin, Jefferson, Madison | 42 min |
| Aug 29, 8:37 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark | 38 min |
| Aug 29, 9:01 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin | 29 min |
| Aug 29, 9:24 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Gallatin, Meagher | 36 min |
| Aug 30, 12:37 AM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 38 min |
| Aug 30, 6:33 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Garfield, McCone, Prairie, Richland | 57 min |
| Aug 30, 6:40 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River | 50 min |
| Aug 30, 8:52 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt, Sheridan, Wibaux | 53 min |
| Aug 30, 9:44 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Sheridan | 33 min |
| Sep 3, 6:18 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 27 min |
| Sep 4, 5:55 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 35 min |
| Sep 4, 6:28 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 47 min |
| Sep 9, 6:29 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Carbon | 31 min |
| Sep 21, 6:41 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 34 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Garfield County25
- Valley County24
- Carter County20
- Dawson County19
- Big Horn County18
- McCone County16
- Richland County16
- Roosevelt County16
- Phillips County14
- Fergus County14
- Custer County13
- Prairie County13
- Cascade County12
- Rosebud County12
- Wibaux County12
- Chouteau County12
- Powder River County11
- Daniels County9
- Judith Basin County9
- Lewis and Clark County8
- Petroleum County8
- Sheridan County8
- Blaine County8
- Meagher County8
- Gallatin County7
- Fallon County7
- Hill County7
- Teton County6
- Musselshell County6
- Broadwater County6
- Beaverhead County6
- Mineral County5
- Yellowstone County5
- Jefferson County5
- Madison County5
- Missoula County5
- Treasure County4
- Pondera County4
- Glacier County4
- Sweet Grass County3
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20222024
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.