Alert archive / Montana / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in Montana, 2010
446 severe thunderstorm warnings in 2010. 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 2010. Tap one for its archive.
- Severe Thunderstorm Warnings
- 446
- Busiest month
- July161 severe thunderstorm warnings
- Busiest day
- July 1, 201030 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.
225 of 446 severe thunderstorm warnings covering Montana in 2010 had a qualifying storm report inside them; 368 of 539 hail, wind and damage reports fell inside a warning, on average 23 minutes after it went out.
Montana, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Severe thunderstorm warnings | 446 | 225 | 50% | 539 | 68% | 23 min |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Missoula, MT: severe thunderstorm warnings | 53 | 23 | 57% | 67 | 55% | 19 min |
| NWS Great Falls, MT: severe thunderstorm warnings | 68 | 40 | 41% | 96 | 67% | 21 min |
| NWS Glasgow, MT: severe thunderstorm warnings | 181 | 104 | 43% | 216 | 74% | 26 min |
| NWS Billings, MT: severe thunderstorm warnings | 168 | 68 | 60% | 200 | 67% | 22 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 |
|---|---|---|---|---|
| Apr 13, 4:14 AM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum, Phillips | 61 min |
| May 18, 3:57 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Fergus, Judith Basin | 48 min |
| May 18, 6:19 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 56 min |
| May 18, 7:24 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 51 min |
| May 18, 7:35 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 15 min |
| May 18, 8:12 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 48 min |
| May 18, 9:35 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum, Phillips | 55 min |
| May 20, 3:15 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 31 min |
| May 26, 5:06 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 51 min |
| May 26, 6:10 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River, Rosebud | 65 min |
| May 26, 7:19 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River, Rosebud | 56 min |
| May 26, 10:48 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 57 min |
| May 27, 2:55 PM MDT | Severe Thunderstorm Warning | TFX | Hill, Liberty | 40 min |
| May 27, 8:34 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Prairie | 26 min |
| May 27, 8:45 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 30 min |
| May 27, 8:58 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Prairie | 47 min |
| May 27, 9:29 PM MDT | Severe Thunderstorm Warning | GGW | McCone | 61 min |
| May 27, 9:57 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 23 min |
| May 27, 10:11 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud, Treasure, Yellowstone | 58 min |
| May 27, 10:27 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 63 min |
| May 27, 10:43 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Valley | 62 min |
| May 27, 10:55 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone | 64 min |
| May 27, 10:57 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud, Treasure | 63 min |
| May 27, 11:17 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Valley | 58 min |
| May 27, 11:42 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Roosevelt | 63 min |
| May 28, 12:40 AM MDT | Severe Thunderstorm Warning | GGW | McCone, Roosevelt, Valley | 65 min |
| May 28, 1:05 AM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland, Roosevelt | 55 min |
| May 28, 1:18 AM MDT | Severe Thunderstorm Warning | GGW | Daniels, McCone, Roosevelt, Sheridan | 57 min |
| May 28, 2:06 AM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt, Sheridan | 39 min |
| May 28, 2:40 AM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Sheridan | 50 min |
| May 28, 9:06 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 39 min |
| May 28, 9:45 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River, Rosebud | 60 min |
| May 28, 9:46 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 44 min |
| May 28, 10:41 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 64 min |
| May 28, 11:28 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 62 min |
| May 28, 11:48 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Wibaux | 57 min |
| May 29, 12:41 AM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland, Wibaux | 64 min |
| Jun 1, 5:43 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark, Teton | 47 min |
| Jun 15, 2:19 PM MDT | Severe Thunderstorm Warning | BYZ | Park | 26 min |
| Jun 15, 3:05 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Teton | 40 min |
| Jun 15, 3:40 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 50 min |
| Jun 15, 4:01 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 59 min |
| Jun 15, 4:52 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Wheatland | 38 min |
| Jun 15, 6:04 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 56 min |
| Jun 15, 7:00 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 45 min |
| Jun 16, 2:36 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater | 39 min |
| Jun 16, 3:15 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater | 30 min |
| Jun 16, 3:40 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 22 min |
| Jun 16, 3:46 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater | 29 min |
| Jun 16, 3:58 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 47 min |
| Jun 16, 4:02 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon | 28 min |
| Jun 16, 4:27 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Carbon | 63 min |
| Jun 16, 4:28 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Wheatland | 32 min |
| Jun 16, 4:41 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 49 min |
| Jun 16, 5:14 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Yellowstone | 46 min |
| Jun 16, 5:19 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 30 min |
| Jun 16, 6:01 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Musselshell, Treasure, Yellowstone | 59 min |
| Jun 16, 6:10 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 50 min |
| Jun 16, 6:23 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum | 27 min |
| Jun 16, 6:35 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 25 min |
| Jun 16, 6:40 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 40 min |
| Jun 16, 6:50 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Wibaux | 55 min |
| Jun 16, 7:23 PM MDT | Severe Thunderstorm Warning | GGW | Dawson | 67 min |
| Jun 16, 7:33 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 57 min |
| Jun 16, 7:40 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Richland, Roosevelt | 65 min |
| Jun 16, 8:03 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Garfield, McCone | 42 min |
| Jun 16, 8:05 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Wibaux | 44 min |
| Jun 16, 8:07 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 23 min |
| Jun 16, 8:07 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland | 44 min |
| Jun 16, 8:17 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Sheridan | 58 min |
| Jun 16, 8:24 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 51 min |
| Jun 16, 8:49 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 56 min |
| Jun 16, 8:58 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland, Roosevelt, Valley | 62 min |
| Jun 16, 9:14 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Sheridan | 61 min |
| Jun 16, 9:33 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Sheridan, Valley | 57 min |
| Jun 16, 9:41 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 34 min |
| Jun 19, 8:34 PM MDT | Severe Thunderstorm Warning | MSO | Sanders | 27 min |
| Jun 20, 2:25 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Treasure, Yellowstone | 32 min |
| Jun 20, 2:44 PM MDT | Severe Thunderstorm Warning | BYZ | Park | 46 min |
| Jun 20, 2:52 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 38 min |
| Jun 20, 3:14 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud, Treasure | 61 min |
| Jun 20, 3:17 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 58 min |
| Jun 20, 3:20 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 18 min |
| Jun 20, 3:28 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud, Treasure, Yellowstone | 62 min |
| Jun 20, 3:39 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 51 min |
| Jun 20, 3:40 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 65 min |
| Jun 20, 3:53 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 19 min |
| Jun 20, 4:02 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Jefferson, Lewis and Clark | 43 min |
| Jun 20, 4:15 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell, Yellowstone | 60 min |
| Jun 20, 4:16 PM MDT | Severe Thunderstorm Warning | TFX | Judith Basin | 59 min |
| Jun 20, 4:18 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley | 57 min |
| Jun 20, 4:26 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell, Rosebud | 23 min |
| Jun 20, 4:32 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Prairie | 34 min |
| Jun 20, 4:44 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Lewis and Clark, Meagher | 61 min |
| Jun 20, 4:44 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Fergus, Judith Basin | 46 min |
| Jun 20, 4:45 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum | 60 min |
| Jun 20, 4:46 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 59 min |
| Jun 20, 4:47 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Carbon, Yellowstone | 43 min |
| Jun 20, 4:55 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 65 min |
| Jun 20, 5:06 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 54 min |
| Jun 20, 5:18 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Musselshell, Yellowstone | 46 min |
| Jun 20, 5:25 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Fergus, Judith Basin | 65 min |
| Jun 20, 5:36 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 54 min |
| Jun 20, 5:41 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum | 64 min |
| Jun 20, 6:00 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 60 min |
| Jun 20, 6:08 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 67 min |
| Jun 20, 6:12 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 63 min |
| Jun 20, 7:09 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Fallon | 51 min |
| Jun 20, 7:09 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud, Treasure | 49 min |
| Jun 21, 2:57 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum, Phillips, Valley | 63 min |
| Jun 21, 3:41 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Valley | 64 min |
| Jun 21, 3:51 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 54 min |
| Jun 21, 4:16 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 39 min |
| Jun 21, 4:38 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Valley | 52 min |
| Jun 21, 5:24 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 66 min |
| Jun 21, 5:26 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Roosevelt, Valley | 64 min |
| Jun 21, 5:49 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River, Rosebud | 56 min |
| Jun 21, 6:26 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland, Roosevelt | 64 min |
| Jun 21, 6:41 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Yellowstone | 39 min |
| Jun 21, 7:20 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 55 min |
| Jun 21, 7:26 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland, Roosevelt | 64 min |
| Jun 21, 8:21 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 54 min |
| Jun 21, 8:26 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland, Roosevelt, Wibaux | 64 min |
| Jun 21, 8:32 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie | 58 min |
| Jun 21, 8:52 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Richland, Wibaux | 53 min |
| Jun 21, 9:00 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 60 min |
| Jun 21, 9:58 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 32 min |
| Jun 21, 10:03 PM MDT | Severe Thunderstorm Warning | GGW | Wibaux | 27 min |
| Jun 22, 2:40 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 65 min |
| Jun 22, 4:05 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 55 min |
| Jun 22, 5:13 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 62 min |
| Jun 22, 6:11 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 51 min |
| Jun 22, 10:00 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater | 30 min |
| Jun 24, 4:20 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Valley | 25 min |
| Jun 24, 4:45 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Valley | 50 min |
| Jun 24, 6:07 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Valley | 23 min |
| Jun 24, 6:16 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, McCone, Richland, Roosevelt, Valley | 59 min |
| Jun 24, 7:09 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt | 51 min |
| Jun 24, 7:53 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt | 37 min |
| Jun 24, 10:55 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 65 min |
| Jun 24, 11:22 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 16 min |
| Jun 25, 9:19 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 41 min |
| Jun 25, 9:31 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell, Yellowstone | 44 min |
| Jun 26, 1:21 AM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 54 min |
| Jun 26, 10:14 AM MDT | Severe Thunderstorm Warning | BYZ | Carter | 18 min |
| Jun 26, 2:33 PM MDT | Severe Thunderstorm Warning | GGW | Wibaux | 27 min |
| Jun 29, 2:38 PM MDT | Severe Thunderstorm Warning | MSO | Missoula, Ravalli | 44 min |
| Jun 29, 3:34 PM MDT | Severe Thunderstorm Warning | MSO | Missoula, Powell | 26 min |
| Jun 29, 3:37 PM MDT | Severe Thunderstorm Warning | MSO | Flathead, Missoula, Powell | 27 min |
| Jun 29, 3:50 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Sweet Grass, Wheatland | 55 min |
| Jun 29, 4:10 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 50 min |
| Jun 29, 4:24 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Musselshell, Wheatland | 51 min |
| Jun 29, 4:39 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark, Teton | 36 min |
| Jun 29, 4:48 PM MDT | Severe Thunderstorm Warning | TFX | Pondera, Toole | 27 min |
| Jun 29, 4:57 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Lewis and Clark, Teton | 48 min |
| Jun 29, 5:40 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau | 29 min |
| Jun 29, 5:44 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum, Phillips | 56 min |
| Jun 29, 5:59 PM MDT | Severe Thunderstorm Warning | MSO | Missoula, Powell | 43 min |
| Jun 29, 7:47 PM MDT | Severe Thunderstorm Warning | TFX | Glacier, Pondera | 43 min |
| Jun 29, 8:07 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 53 min |
| Jun 29, 8:26 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Prairie | 64 min |
| Jun 29, 8:31 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Prairie | 59 min |
| Jun 29, 8:39 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Roosevelt, Valley | 52 min |
| Jun 29, 9:34 PM MDT | Severe Thunderstorm Warning | MSO | Missoula | 41 min |
| Jun 29, 9:52 PM MDT | Severe Thunderstorm Warning | GGW | McCone | 41 min |
| Jun 29, 10:10 PM MDT | Severe Thunderstorm Warning | MSO | Missoula, Powell | 35 min |
| Jun 29, 10:49 PM MDT | Severe Thunderstorm Warning | MSO | Ravalli | 22 min |
| Jun 29, 10:49 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark, Teton | 41 min |
| Jun 29, 11:10 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Ravalli | 22 min |
| Jun 29, 11:46 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 24 min |
| Jun 30, 2:36 PM MDT | Severe Thunderstorm Warning | TFX | Madison | 39 min |
| Jun 30, 2:38 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin, Meagher | 52 min |
| Jun 30, 2:41 PM MDT | Severe Thunderstorm Warning | BYZ | Park, Sweet Grass | 64 min |
| Jun 30, 3:10 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin, Madison | 50 min |
| Jun 30, 3:15 PM MDT | Severe Thunderstorm Warning | BYZ | Park | 43 min |
| Jun 30, 3:19 PM MDT | Severe Thunderstorm Warning | BYZ | Park, Sweet Grass | 56 min |
| Jun 30, 3:50 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Gallatin, Meagher | 55 min |
| Jun 30, 4:02 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 58 min |
| Jun 30, 4:03 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Stillwater, Sweet Grass, Wheatland | 48 min |
| Jun 30, 4:18 PM MDT | Severe Thunderstorm Warning | BYZ | Park | 57 min |
| Jun 30, 4:51 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 54 min |
| Jun 30, 4:55 PM MDT | Severe Thunderstorm Warning | BYZ | Park, Sweet Grass | 65 min |
| Jun 30, 5:23 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 52 min |
| Jun 30, 5:42 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Stillwater, Sweet Grass, Wheatland | 63 min |
| Jun 30, 5:46 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Powder River, Rosebud | 40 min |
| Jun 30, 6:13 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 62 min |
| Jun 30, 6:20 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Musselshell, Stillwater, Wheatland | 55 min |
| Jun 30, 6:58 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 62 min |
| Jun 30, 7:33 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Custer, Fallon, Powder River | 57 min |
| Jun 30, 7:36 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Fallon | 26 min |
| Jun 30, 8:25 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Granite, Powell | 50 min |
| Jun 30, 8:34 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Wibaux | 56 min |
| Jun 30, 9:14 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 31 min |
| Jun 30, 9:27 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Wibaux | 63 min |
| Jul 1, 10:40 AM MDT | Severe Thunderstorm Warning | BYZ | Park, Sweet Grass | 49 min |
| Jul 1, 1:41 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Jefferson, Lewis and Clark | 49 min |
| Jul 1, 2:17 PM MDT | Severe Thunderstorm Warning | TFX | Jefferson, Lewis and Clark | 34 min |
| Jul 1, 2:20 PM MDT | Severe Thunderstorm Warning | BYZ | Park, Sweet Grass | 55 min |
| Jul 1, 2:27 PM MDT | Severe Thunderstorm Warning | TFX | Jefferson, Madison | 29 min |
| Jul 1, 2:27 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Jefferson, Lewis and Clark, Meagher | 48 min |
| Jul 1, 3:13 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 16 min |
| Jul 1, 3:15 PM MDT | Severe Thunderstorm Warning | BYZ | Park, Sweet Grass | 60 min |
| Jul 1, 3:16 PM MDT | Severe Thunderstorm Warning | MSO | Silver Bow | 15 min |
| Jul 1, 3:16 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Lewis and Clark, Meagher | 44 min |
| Jul 1, 3:18 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 42 min |
| Jul 1, 3:38 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Silver Bow | 22 min |
| Jul 1, 4:01 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Wheatland | 35 min |
| Jul 1, 4:13 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Stillwater, Sweet Grass | 62 min |
| Jul 1, 4:26 PM MDT | Severe Thunderstorm Warning | TFX | Fergus, Judith Basin | 49 min |
| Jul 1, 4:42 PM MDT | Severe Thunderstorm Warning | TFX | Jefferson | 48 min |
| Jul 1, 4:58 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin, Madison | 32 min |
| Jul 1, 5:06 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Stillwater | 39 min |
| Jul 1, 5:27 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 48 min |
| Jul 1, 5:41 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Musselshell, Stillwater, Yellowstone | 64 min |
| Jul 1, 5:51 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum, Phillips | 24 min |
| Jul 1, 6:16 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Hill | 44 min |
| Jul 1, 6:42 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell, Yellowstone | 48 min |
| Jul 1, 6:53 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 67 min |
| Jul 1, 7:19 PM MDT | Severe Thunderstorm Warning | BYZ | Treasure, Yellowstone | 56 min |
| Jul 1, 7:55 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 65 min |
| Jul 1, 7:55 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Valley | 54 min |
| Jul 1, 8:09 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud, Treasure | 51 min |
| Jul 1, 8:28 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Valley | 62 min |
| Jul 1, 8:42 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 63 min |
| Jul 1, 8:50 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 55 min |
| Jul 1, 8:55 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Treasure | 50 min |
| Jul 1, 9:24 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 54 min |
| Jul 1, 9:28 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Valley | 62 min |
| Jul 1, 9:35 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Prairie | 55 min |
| Jul 1, 10:08 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 67 min |
| Jul 1, 10:14 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 61 min |
| Jul 1, 10:29 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt | 61 min |
| Jul 1, 10:59 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland, Roosevelt | 61 min |
| Jul 1, 11:56 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt, Sheridan | 64 min |
| Jul 2, 9:16 AM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Liberty, Pondera, Teton, Toole | 44 min |
| Jul 2, 9:53 AM MDT | Severe Thunderstorm Warning | TFX | Hill, Liberty, Pondera, Toole | 67 min |
| Jul 2, 10:43 AM MDT | Severe Thunderstorm Warning | TFX | Hill, Liberty | 32 min |
| Jul 2, 2:40 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Gallatin, Madison | 50 min |
| Jul 2, 4:23 PM MDT | Severe Thunderstorm Warning | BYZ | Wheatland | 37 min |
| Jul 2, 4:48 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 42 min |
| Jul 2, 5:44 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 46 min |
| Jul 2, 9:35 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone | 55 min |
| Jul 2, 9:38 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 32 min |
| Jul 2, 9:51 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone | 54 min |
| Jul 2, 10:12 PM MDT | Severe Thunderstorm Warning | GGW | McCone | 63 min |
| Jul 2, 10:15 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Valley | 22 min |
| Jul 2, 10:46 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland, Roosevelt | 59 min |
| Jul 2, 11:35 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt | 55 min |
| Jul 2, 11:39 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 66 min |
| Jul 3, 12:09 AM MDT | Severe Thunderstorm Warning | GGW | McCone, Prairie | 66 min |
| Jul 3, 12:15 AM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 60 min |
| Jul 3, 12:17 AM MDT | Severe Thunderstorm Warning | GGW | Valley | 25 min |
| Jul 3, 12:22 AM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Prairie | 53 min |
| Jul 3, 12:26 AM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt, Sheridan | 35 min |
| Jul 3, 12:32 AM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland | 58 min |
| Jul 3, 1:09 AM MDT | Severe Thunderstorm Warning | GGW | Dawson, Garfield, McCone, Prairie | 66 min |
| Jul 3, 1:16 AM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland, Roosevelt | 59 min |
| Jul 3, 2:02 AM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie, Richland | 58 min |
| Jul 3, 2:07 AM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt | 53 min |
| Jul 10, 2:54 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 29 min |
| Jul 10, 7:41 PM MDT | Severe Thunderstorm Warning | TFX | Glacier, Pondera | 49 min |
| Jul 10, 8:26 PM MDT | Severe Thunderstorm Warning | TFX | Glacier, Pondera, Teton, Toole | 49 min |
| Jul 12, 5:40 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Valley | 58 min |
| Jul 12, 5:46 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone | 59 min |
| Jul 12, 5:53 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Valley | 62 min |
| Jul 12, 6:28 PM MDT | Severe Thunderstorm Warning | GGW | McCone | 40 min |
| Jul 12, 7:25 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland | 65 min |
| Jul 12, 9:07 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 24 min |
| Jul 13, 11:39 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 21 min |
| Jul 18, 3:58 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud, Treasure | 47 min |
| Jul 18, 5:19 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 41 min |
| Jul 18, 6:00 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 60 min |
| Jul 18, 6:05 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 55 min |
| Jul 18, 6:23 PM MDT | Severe Thunderstorm Warning | GGW | Prairie | 52 min |
| Jul 18, 6:28 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 62 min |
| Jul 18, 6:30 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River, Rosebud | 60 min |
| Jul 18, 6:52 PM MDT | Severe Thunderstorm Warning | GGW | Prairie | 29 min |
| Jul 18, 6:55 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Custer, Fallon | 65 min |
| Jul 18, 7:32 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Custer, Fallon | 58 min |
| Jul 19, 1:31 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Custer, Powder River | 59 min |
| Jul 19, 2:18 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 57 min |
| Jul 19, 3:36 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark, Teton | 39 min |
| Jul 19, 4:54 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Meagher | 51 min |
| Jul 19, 5:05 PM MDT | Severe Thunderstorm Warning | TFX | Glacier | 40 min |
| Jul 19, 5:21 PM MDT | Severe Thunderstorm Warning | TFX | Glacier | 39 min |
| Jul 19, 5:53 PM MDT | Severe Thunderstorm Warning | TFX | Glacier, Toole | 52 min |
| Jul 19, 6:02 PM MDT | Severe Thunderstorm Warning | TFX | Glacier, Pondera | 43 min |
| Jul 19, 7:13 PM MDT | Severe Thunderstorm Warning | TFX | Pondera, Toole | 47 min |
| Jul 19, 7:55 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Pondera, Teton | 50 min |
| Jul 19, 8:39 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 51 min |
| Jul 20, 12:31 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt | 59 min |
| Jul 20, 1:17 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 43 min |
| Jul 20, 1:28 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt | 32 min |
| Jul 20, 10:35 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 42 min |
| Jul 21, 9:38 AM MDT | Severe Thunderstorm Warning | BYZ | Carter | 22 min |
| Jul 21, 4:36 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Powder River, Rosebud | 54 min |
| Jul 21, 5:20 PM MDT | Severe Thunderstorm Warning | TFX | Judith Basin | 40 min |
| Jul 21, 6:30 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 30 min |
| Jul 21, 9:08 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell, Yellowstone | 67 min |
| Jul 21, 9:37 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud, Treasure, Yellowstone | 53 min |
| Jul 21, 10:15 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 60 min |
| Jul 21, 10:31 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Custer, Rosebud, Treasure | 59 min |
| Jul 22, 7:06 PM MDT | Severe Thunderstorm Warning | MSO | Flathead, Lake | 39 min |
| Jul 25, 10:55 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 55 min |
| Jul 26, 5:30 PM MDT | Severe Thunderstorm Warning | GGW | Daniels | 60 min |
| Jul 26, 6:14 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River | 35 min |
| Jul 26, 6:26 PM MDT | Severe Thunderstorm Warning | GGW | Daniels | 34 min |
| Jul 26, 6:26 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Wibaux | 32 min |
| Jul 26, 6:27 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Sheridan | 63 min |
| Jul 26, 7:22 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 53 min |
| Jul 27, 1:39 AM MDT | Severe Thunderstorm Warning | TFX | Hill, Liberty, Toole | 51 min |
| Jul 27, 2:25 AM MDT | Severe Thunderstorm Warning | TFX | Hill, Liberty | 35 min |
| Jul 27, 3:14 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Carbon | 46 min |
| Jul 27, 3:55 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Gallatin | 50 min |
| Jul 27, 5:00 PM MDT | Severe Thunderstorm Warning | BYZ | Park | 30 min |
| Jul 27, 5:32 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 58 min |
| Jul 27, 6:11 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Carbon | 49 min |
| Jul 27, 6:21 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 54 min |
| Jul 27, 6:42 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon, Stillwater, Sweet Grass | 53 min |
| Jul 27, 7:00 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Carbon | 45 min |
| Jul 27, 7:10 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Powder River, Rosebud | 35 min |
| Jul 27, 7:45 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Carbon | 60 min |
| Jul 27, 8:44 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 46 min |
| Jul 28, 4:50 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 55 min |
| Jul 28, 5:48 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 27 min |
| Jul 28, 6:15 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 60 min |
| Jul 28, 7:15 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 60 min |
| Jul 28, 8:27 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Valley | 63 min |
| Jul 28, 9:25 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Valley | 65 min |
| Jul 29, 3:35 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Valley | 55 min |
| Jul 29, 3:44 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Valley | 61 min |
| Jul 29, 3:51 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Valley | 54 min |
| Jul 29, 4:29 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt | 61 min |
| Jul 29, 4:38 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Sheridan | 44 min |
| Jul 29, 4:44 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Sheridan | 40 min |
| Jul 29, 5:28 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt | 62 min |
| Jul 29, 6:02 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 28 min |
| Jul 29, 6:11 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt, Sheridan | 64 min |
| Jul 29, 6:28 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Valley | 62 min |
| Jul 29, 7:14 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 16 min |
| Jul 29, 7:15 PM MDT | Severe Thunderstorm Warning | GGW | McCone | 31 min |
| Jul 31, 1:33 PM MDT | Severe Thunderstorm Warning | MSO | Ravalli | 42 min |
| Jul 31, 2:58 PM MDT | Severe Thunderstorm Warning | BYZ | Park, Sweet Grass | 54 min |
| Jul 31, 3:01 PM MDT | Severe Thunderstorm Warning | GGW | Daniels | 31 min |
| Jul 31, 4:25 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon, Stillwater, Yellowstone | 65 min |
| Jul 31, 5:31 PM MDT | Severe Thunderstorm Warning | MSO | Flathead, Lake, Sanders | 29 min |
| Jul 31, 6:07 PM MDT | Severe Thunderstorm Warning | BYZ | Park | 53 min |
| Jul 31, 6:33 PM MDT | Severe Thunderstorm Warning | MSO | Missoula | 27 min |
| Jul 31, 6:59 PM MDT | Severe Thunderstorm Warning | BYZ | Park, Stillwater, Sweet Grass | 61 min |
| Jul 31, 7:01 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead, Madison | 25 min |
| Jul 31, 7:27 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 63 min |
| Jul 31, 7:30 PM MDT | Severe Thunderstorm Warning | MSO | Flathead, Lake, Sanders | 45 min |
| Jul 31, 7:34 PM MDT | Severe Thunderstorm Warning | MSO | Missoula, Sanders | 41 min |
| Jul 31, 7:36 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 24 min |
| Jul 31, 7:49 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula, Ravalli | 41 min |
| Jul 31, 7:55 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon, Stillwater | 50 min |
| Jul 31, 7:58 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 16 min |
| Jul 31, 8:10 PM MDT | Severe Thunderstorm Warning | MSO | Flathead, Lake | 30 min |
| Jul 31, 8:22 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Valley | 68 min |
| Jul 31, 8:32 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Roosevelt, Valley | 58 min |
| Jul 31, 9:50 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Granite, Ravalli | 25 min |
| Aug 1, 2:02 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Sheridan | 58 min |
| Aug 1, 2:26 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 50 min |
| Aug 1, 2:33 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt | 41 min |
| Aug 1, 2:47 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt | 13 min |
| Aug 1, 4:35 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Valley | 55 min |
| Aug 1, 5:11 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin | 20 min |
| Aug 1, 5:28 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt | 62 min |
| Aug 1, 5:44 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum | 61 min |
| Aug 1, 5:46 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 44 min |
| Aug 1, 6:19 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 41 min |
| Aug 1, 6:27 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 63 min |
| Aug 1, 6:56 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 64 min |
| Aug 1, 7:12 PM MDT | Severe Thunderstorm Warning | TFX | Fergus, Judith Basin | 48 min |
| Aug 1, 8:16 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 59 min |
| Aug 1, 10:37 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 35 min |
| Aug 2, 8:54 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Hill | 51 min |
| Aug 3, 6:34 AM MDT | Severe Thunderstorm Warning | BYZ | Rosebud, Treasure | 14 min |
| Aug 5, 4:02 PM MDT | Severe Thunderstorm Warning | MSO | Ravalli | 20 min |
| Aug 5, 5:29 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Silver Bow | 46 min |
| Aug 5, 6:07 PM MDT | Severe Thunderstorm Warning | MSO | Granite | 38 min |
| Aug 5, 7:32 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 29 min |
| Aug 6, 2:51 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Ravalli | 39 min |
| Aug 6, 4:09 PM MDT | Severe Thunderstorm Warning | MSO | Flathead | 51 min |
| Aug 6, 4:53 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater, Yellowstone | 67 min |
| Aug 6, 5:25 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Yellowstone | 50 min |
| Aug 6, 5:33 PM MDT | Severe Thunderstorm Warning | MSO | Ravalli | 30 min |
| Aug 6, 6:47 PM MDT | Severe Thunderstorm Warning | MSO | Ravalli | 43 min |
| Aug 6, 6:49 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Judith Basin | 41 min |
| Aug 6, 7:32 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 58 min |
| Aug 6, 8:29 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Roosevelt, Valley | 61 min |
| Aug 6, 9:24 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Roosevelt, Valley | 66 min |
| Aug 6, 10:15 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone | 60 min |
| Aug 6, 10:23 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland | 67 min |
| Aug 6, 10:47 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland | 58 min |
| Aug 6, 11:32 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland, Roosevelt, Wibaux | 58 min |
| Aug 7, 3:13 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Powder River, Rosebud | 40 min |
| Aug 9, 10:29 PM MDT | Severe Thunderstorm Warning | GGW | Dawson | 30 min |
| Aug 9, 10:53 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland | 34 min |
| Aug 9, 11:21 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 54 min |
| Aug 10, 4:47 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge | 43 min |
| Aug 10, 4:58 PM MDT | Severe Thunderstorm Warning | MSO | Missoula | 42 min |
| Aug 10, 5:12 PM MDT | Severe Thunderstorm Warning | MSO | Mineral | 21 min |
| Aug 10, 5:30 PM MDT | Severe Thunderstorm Warning | MSO | Mineral, Missoula | 21 min |
| Aug 10, 5:43 PM MDT | Severe Thunderstorm Warning | MSO | Lake, Sanders | 62 min |
| Aug 11, 4:10 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Fergus, Judith Basin | 65 min |
| Aug 11, 5:16 PM MDT | Severe Thunderstorm Warning | TFX | Fergus, Judith Basin | 59 min |
| Aug 11, 5:23 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Valley | 67 min |
| Aug 11, 5:50 PM MDT | Severe Thunderstorm Warning | GGW | Daniels | 55 min |
| Aug 11, 5:55 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland | 24 min |
| Aug 11, 6:15 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 60 min |
| Aug 11, 6:41 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Valley | 64 min |
| Aug 11, 6:59 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 31 min |
| Aug 11, 7:28 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 30 min |
| Aug 11, 7:36 PM MDT | Severe Thunderstorm Warning | GGW | Daniels | 54 min |
| Aug 11, 7:46 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Judith Basin | 29 min |
| Aug 11, 8:21 PM MDT | Severe Thunderstorm Warning | GGW | Daniels | 54 min |
| Aug 11, 8:43 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 62 min |
| Aug 11, 8:59 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 50 min |
| Aug 11, 9:05 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 55 min |
| Aug 11, 9:20 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Sheridan | 19 min |
| Aug 11, 9:30 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Valley | 60 min |
| Aug 11, 10:16 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Valley | 59 min |
| Aug 12, 4:35 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 40 min |
| Aug 12, 5:50 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 18 min |
| Aug 12, 6:00 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Wibaux | 60 min |
| Aug 19, 4:00 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt | 57 min |
| Aug 21, 2:19 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 56 min |
| Aug 21, 5:53 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Valley | 67 min |
| Aug 21, 6:53 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland, Roosevelt | 67 min |
| Aug 21, 7:52 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Sheridan | 53 min |
| Aug 26, 8:09 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula, Ravalli | 36 min |
| Aug 26, 8:37 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula, Powell | 23 min |
| Aug 29, 3:55 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Yellowstone | 55 min |
| Aug 29, 6:46 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 29 min |
| Aug 29, 7:49 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 47 min |
| Aug 29, 7:59 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 61 min |
| Sep 5, 9:13 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 31 min |
| Sep 9, 2:46 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 59 min |
| Sep 9, 3:13 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 21 min |
| Sep 9, 4:37 PM MDT | Severe Thunderstorm Warning | BYZ | Wheatland | 23 min |
| Sep 9, 4:39 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River, Rosebud | 32 min |
| Sep 9, 7:19 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Wibaux | 41 min |
| Sep 9, 7:35 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 23 min |
| Sep 14, 4:10 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Jefferson | 50 min |
| Sep 14, 6:37 PM MDT | Severe Thunderstorm Warning | BYZ | Sweet Grass, Wheatland | 23 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- McCone County55
- Roosevelt County55
- Valley County50
- Big Horn County41
- Rosebud County41
- Richland County40
- Dawson County39
- Garfield County38
- Carter County27
- Daniels County24
- Powder River County22
- Prairie County22
- Yellowstone County22
- Sheridan County21
- Custer County20
- Phillips County18
- Stillwater County15
- Chouteau County14
- Treasure County14
- Wibaux County14
- Lewis and Clark County14
- Park County14
- Sweet Grass County14
- Golden Valley County13
- Missoula County13
- Musselshell County12
- Petroleum County11
- Fergus County11
- Judith Basin County11
- Wheatland County11
- Ravalli County11
- Carbon County10
- Fallon County10
- Powell County10
- Teton County9
- Broadwater County9
- Pondera County9
- Hill County8
- Cascade County8
- Granite County8
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20092011
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.