Alert archive / Montana / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in Montana, 2019
459 severe thunderstorm warnings in 2019. 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 2019. Tap one for its archive.
- Severe Thunderstorm Warnings
- 459
- Busiest month
- July212 severe thunderstorm warnings
- Busiest day
- August 11, 201936 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.
213 of 459 severe thunderstorm warnings covering Montana in 2019 had a qualifying storm report inside them; 389 of 569 hail, wind and damage reports fell inside a warning, on average 25 minutes after it went out.
Montana, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Severe thunderstorm warnings | 459 | 213 | 54% | 569 | 68% | 25 min |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Great Falls, MT: severe thunderstorm warnings | 135 | 58 | 57% | 163 | 66% | 18 min |
| NWS Glasgow, MT: severe thunderstorm warnings | 119 | 66 | 45% | 144 | 74% | 27 min |
| NWS Billings, MT: severe thunderstorm warnings | 185 | 83 | 55% | 233 | 73% | 29 min |
| NWS Missoula, MT: severe thunderstorm warnings | 35 | 14 | 60% | 52 | 35% | 9 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 10, 5:59 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 46 min |
| May 14, 4:34 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 41 min |
| May 26, 3:31 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 44 min |
| May 26, 4:09 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon, Stillwater | 66 min |
| May 26, 4:12 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 37 min |
| May 26, 4:23 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Stillwater | 52 min |
| May 26, 4:37 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 53 min |
| May 26, 6:10 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 50 min |
| May 26, 7:04 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Musselshell, Stillwater, Yellowstone | 56 min |
| May 26, 7:52 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Musselshell, Yellowstone | 53 min |
| May 26, 9:15 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 30 min |
| May 26, 9:26 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 34 min |
| Jun 3, 4:01 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 25 min |
| Jun 5, 2:21 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 39 min |
| Jun 5, 2:55 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 44 min |
| Jun 6, 4:31 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin | 29 min |
| Jun 6, 5:11 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum, Phillips | 64 min |
| Jun 6, 6:50 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 55 min |
| Jun 6, 8:08 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Valley | 67 min |
| Jun 7, 4:36 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 54 min |
| Jun 7, 5:02 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 58 min |
| Jun 7, 6:00 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 60 min |
| Jun 7, 6:31 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 31 min |
| Jun 13, 1:40 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Gallatin | 40 min |
| Jun 14, 12:08 PM MDT | Severe Thunderstorm Warning | TFX | Glacier | 37 min |
| Jun 14, 12:44 PM MDT | Severe Thunderstorm Warning | TFX | Glacier, Pondera | 46 min |
| Jun 14, 1:21 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 39 min |
| Jun 14, 1:29 PM MDT | Severe Thunderstorm Warning | TFX | Pondera, Teton | 46 min |
| Jun 14, 2:04 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 56 min |
| Jun 14, 2:12 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Pondera, Teton | 33 min |
| Jun 14, 2:18 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 42 min |
| Jun 14, 2:28 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 32 min |
| Jun 14, 2:43 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Teton | 32 min |
| Jun 14, 2:59 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Fergus, Judith Basin | 31 min |
| Jun 14, 3:13 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau | 32 min |
| Jun 14, 3:45 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Fergus, Judith Basin | 45 min |
| Jun 14, 3:47 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 43 min |
| Jun 18, 12:49 PM MDT | Severe Thunderstorm Warning | TFX | Toole | 26 min |
| Jun 18, 3:15 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Teton | 45 min |
| Jun 18, 4:00 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 45 min |
| Jun 18, 4:44 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Judith Basin | 46 min |
| Jun 18, 7:35 PM MDT | Severe Thunderstorm Warning | TFX | Toole | 25 min |
| Jun 18, 7:47 PM MDT | Severe Thunderstorm Warning | TFX | Liberty, Toole | 28 min |
| Jun 18, 9:01 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Hill, Liberty | 29 min |
| Jun 19, 1:55 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 50 min |
| Jun 19, 4:03 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 57 min |
| Jun 19, 4:14 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 31 min |
| Jun 19, 4:24 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 66 min |
| Jun 19, 4:47 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 58 min |
| Jun 19, 5:29 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 44 min |
| Jun 19, 6:47 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 58 min |
| Jun 19, 8:43 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone | 62 min |
| Jun 19, 9:04 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Wibaux | 56 min |
| Jun 20, 3:41 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 49 min |
| Jun 20, 4:24 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 30 min |
| Jun 25, 3:29 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Carbon, Yellowstone | 40 min |
| Jun 25, 4:34 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 26 min |
| Jun 25, 4:54 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 51 min |
| Jun 25, 5:27 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 63 min |
| Jun 25, 6:59 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 46 min |
| Jun 26, 2:45 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon, Stillwater | 30 min |
| Jun 26, 3:04 PM MDT | Severe Thunderstorm Warning | MSO | Ravalli | 26 min |
| Jun 26, 3:34 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Ravalli | 26 min |
| Jun 26, 4:14 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 20 min |
| Jun 26, 5:16 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 29 min |
| Jun 26, 5:41 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 49 min |
| Jun 26, 5:42 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark | 33 min |
| Jun 26, 5:55 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 35 min |
| Jun 26, 6:20 PM MDT | Severe Thunderstorm Warning | TFX | Fergus, Judith Basin | 25 min |
| Jun 26, 6:24 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 51 min |
| Jun 26, 6:32 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Meagher | 28 min |
| Jun 26, 6:42 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River | 63 min |
| Jun 26, 6:53 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 52 min |
| Jun 26, 6:56 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 34 min |
| Jun 26, 7:16 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Judith Basin | 18 min |
| Jun 26, 7:43 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 62 min |
| Jun 26, 8:44 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 61 min |
| Jun 26, 9:21 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 69 min |
| Jun 27, 6:23 AM MDT | Severe Thunderstorm Warning | MSO | Flathead | 37 min |
| Jun 27, 1:06 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Powell | 24 min |
| Jun 27, 1:21 PM MDT | Severe Thunderstorm Warning | TFX | Jefferson | 24 min |
| Jun 27, 1:45 PM MDT | Severe Thunderstorm Warning | TFX | Jefferson, Lewis and Clark | 30 min |
| Jun 27, 2:27 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Jefferson, Lewis and Clark | 33 min |
| Jun 27, 2:31 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Jefferson | 29 min |
| Jun 27, 2:57 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Jefferson | 20 min |
| Jun 27, 3:17 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Meagher | 28 min |
| Jun 27, 3:45 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Judith Basin, Meagher | 28 min |
| Jun 27, 3:48 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Judith Basin, Meagher | 27 min |
| Jun 27, 4:06 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 24 min |
| Jun 27, 4:06 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Meagher | 10 min |
| Jun 27, 4:10 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Judith Basin | 50 min |
| Jun 27, 4:26 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau | 34 min |
| Jun 27, 4:49 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Fergus, Judith Basin | 26 min |
| Jun 27, 4:54 PM MDT | Severe Thunderstorm Warning | TFX | Hill | 36 min |
| Jun 27, 5:10 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Fergus, Hill, Judith Basin | 35 min |
| Jun 27, 5:20 PM MDT | Severe Thunderstorm Warning | BYZ | Wheatland | 40 min |
| Jun 27, 5:40 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Fergus, Hill | 35 min |
| Jun 27, 5:43 PM MDT | Severe Thunderstorm Warning | TFX | Fergus, Judith Basin | 32 min |
| Jun 27, 5:48 PM MDT | Severe Thunderstorm Warning | TFX | Fergus, Judith Basin | 27 min |
| Jun 27, 6:13 PM MDT | Severe Thunderstorm Warning | BYZ | Wheatland | 62 min |
| Jun 27, 6:19 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Fergus, Hill | 26 min |
| Jun 27, 6:21 PM MDT | Severe Thunderstorm Warning | TFX | Fergus, Judith Basin | 39 min |
| Jun 27, 6:22 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 53 min |
| Jun 27, 6:27 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 22 min |
| Jun 27, 6:45 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Fergus | 60 min |
| Jun 27, 6:53 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum, Phillips | 52 min |
| Jun 27, 6:56 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Wheatland | 64 min |
| Jun 27, 7:16 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 59 min |
| Jun 27, 7:37 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 68 min |
| Jun 27, 7:41 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum, Phillips, Valley | 79 min |
| Jun 27, 7:45 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Musselshell | 60 min |
| Jun 27, 8:19 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Phillips, Valley | 56 min |
| Jun 27, 8:45 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell, Rosebud | 62 min |
| Jun 27, 9:33 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Garfield, McCone, Roosevelt, Valley | 72 min |
| Jun 27, 10:06 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 54 min |
| Jun 27, 11:14 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Prairie | 61 min |
| Jun 27, 11:24 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone | 66 min |
| Jun 28, 12:09 AM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland | 66 min |
| Jun 28, 12:24 AM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 66 min |
| Jun 28, 1:19 AM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland, Wibaux | 43 min |
| Jun 28, 5:49 PM MDT | Severe Thunderstorm Warning | BYZ | Wheatland | 41 min |
| Jun 28, 6:11 PM MDT | Severe Thunderstorm Warning | TFX | Fergus, Judith Basin | 22 min |
| Jun 28, 6:15 PM MDT | Severe Thunderstorm Warning | TFX | Judith Basin | 45 min |
| Jun 28, 6:42 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Fergus | 33 min |
| Jun 28, 6:43 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 47 min |
| Jun 28, 6:52 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 53 min |
| Jun 28, 7:03 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Fergus | 27 min |
| Jun 28, 7:16 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 44 min |
| Jun 28, 7:18 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum, Phillips | 72 min |
| Jun 28, 7:30 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Fergus | 30 min |
| Jun 28, 7:42 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 48 min |
| Jun 28, 8:01 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum | 40 min |
| Jun 28, 8:05 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 55 min |
| Jun 28, 8:13 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 62 min |
| Jun 28, 8:54 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Phillips, Valley | 66 min |
| Jun 28, 9:09 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 31 min |
| Jun 28, 9:23 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 67 min |
| Jun 28, 9:33 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Valley | 72 min |
| Jun 28, 10:14 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Valley | 61 min |
| Jun 28, 10:16 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, McCone, Roosevelt, Valley | 59 min |
| Jun 28, 10:55 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Sheridan, Valley | 80 min |
| Jun 28, 11:06 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Richland, Roosevelt | 54 min |
| Jun 28, 11:55 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Sheridan | 38 min |
| Jun 29, 3:21 AM MDT | Severe Thunderstorm Warning | GGW | Richland | 24 min |
| Jun 29, 1:06 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 22 min |
| Jun 29, 1:17 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 16 min |
| Jun 30, 4:15 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River, Rosebud | 60 min |
| Jun 30, 4:37 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 38 min |
| Jun 30, 4:59 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater, Sweet Grass | 61 min |
| Jun 30, 5:14 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 29 min |
| Jun 30, 5:14 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 26 min |
| Jun 30, 5:39 PM MDT | Severe Thunderstorm Warning | BYZ | Treasure, Yellowstone | 11 min |
| Jun 30, 5:53 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater | 67 min |
| Jun 30, 6:25 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River, Rosebud | 43 min |
| Jun 30, 6:51 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 54 min |
| Jul 1, 1:22 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Liberty, Pondera, Toole | 53 min |
| Jul 1, 2:34 PM MDT | Severe Thunderstorm Warning | TFX | Fergus, Judith Basin | 26 min |
| Jul 1, 3:45 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 45 min |
| Jul 1, 3:45 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Hill | 60 min |
| Jul 1, 3:52 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 53 min |
| Jul 1, 4:00 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Valley | 60 min |
| Jul 1, 4:48 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 57 min |
| Jul 1, 4:57 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 48 min |
| Jul 1, 5:00 PM MDT | Severe Thunderstorm Warning | GGW | Daniels | 60 min |
| Jul 1, 5:07 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 53 min |
| Jul 1, 5:17 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Carbon | 58 min |
| Jul 1, 5:36 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 39 min |
| Jul 1, 5:44 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 42 min |
| Jul 1, 5:46 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 22 min |
| Jul 1, 6:08 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Sheridan | 49 min |
| Jul 1, 6:11 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud, Treasure | 17 min |
| Jul 1, 6:15 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Carbon, Yellowstone | 45 min |
| Jul 1, 6:23 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 67 min |
| Jul 1, 7:01 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud, Treasure | 44 min |
| Jul 1, 7:31 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Sheridan, Valley | 42 min |
| Jul 1, 7:35 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Sheridan | 55 min |
| Jul 1, 7:43 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 46 min |
| Jul 1, 8:09 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Richland, Roosevelt | 19 min |
| Jul 2, 1:32 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Powder River, Rosebud | 43 min |
| Jul 2, 2:14 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 31 min |
| Jul 2, 2:43 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 62 min |
| Jul 2, 3:44 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 61 min |
| Jul 2, 4:20 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 40 min |
| Jul 2, 4:23 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon, Stillwater, Sweet Grass | 57 min |
| Jul 2, 4:44 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 61 min |
| Jul 3, 8:25 AM MDT | Severe Thunderstorm Warning | MSO | Ravalli | 23 min |
| Jul 3, 5:37 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 38 min |
| Jul 3, 7:07 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River, Rosebud | 38 min |
| Jul 3, 7:43 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 35 min |
| Jul 5, 1:09 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 66 min |
| Jul 5, 2:08 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 37 min |
| Jul 5, 2:46 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 44 min |
| Jul 6, 4:19 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon, Stillwater | 41 min |
| Jul 6, 5:00 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon | 60 min |
| Jul 6, 5:00 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 30 min |
| Jul 6, 5:05 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Teton | 25 min |
| Jul 6, 5:27 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Teton | 33 min |
| Jul 6, 5:38 PM MDT | Severe Thunderstorm Warning | TFX | Meagher | 37 min |
| Jul 6, 5:57 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau | 33 min |
| Jul 6, 6:10 PM MDT | Severe Thunderstorm Warning | TFX | Meagher | 35 min |
| Jul 6, 6:18 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau | 27 min |
| Jul 6, 7:01 PM MDT | Severe Thunderstorm Warning | TFX | Meagher | 29 min |
| Jul 6, 7:21 PM MDT | Severe Thunderstorm Warning | TFX | Meagher | 28 min |
| Jul 6, 8:20 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Fergus | 25 min |
| Jul 6, 8:27 PM MDT | Severe Thunderstorm Warning | MSO | Ravalli | 33 min |
| Jul 6, 9:50 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 40 min |
| Jul 6, 9:58 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 32 min |
| Jul 7, 2:51 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 17 min |
| Jul 7, 3:13 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead, Madison | 32 min |
| Jul 7, 3:41 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead, Gallatin, Madison | 34 min |
| Jul 7, 4:14 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Powell | 31 min |
| Jul 7, 5:34 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 41 min |
| Jul 7, 6:12 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 51 min |
| Jul 7, 6:47 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 58 min |
| Jul 7, 6:51 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 54 min |
| Jul 7, 7:18 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 43 min |
| Jul 7, 7:43 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 44 min |
| Jul 7, 8:00 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 60 min |
| Jul 7, 8:35 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Valley | 55 min |
| Jul 7, 8:58 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt | 47 min |
| Jul 7, 9:43 PM MDT | Severe Thunderstorm Warning | GGW | Daniels | 51 min |
| Jul 7, 9:48 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Valley | 57 min |
| Jul 7, 10:19 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Valley | 56 min |
| Jul 7, 10:37 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt | 27 min |
| Jul 7, 10:44 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Valley | 61 min |
| Jul 8, 1:43 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Sheridan | 47 min |
| Jul 8, 2:18 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 30 min |
| Jul 8, 4:58 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 47 min |
| Jul 8, 5:44 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 46 min |
| Jul 8, 5:50 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 55 min |
| Jul 8, 6:23 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 52 min |
| Jul 8, 6:27 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 39 min |
| Jul 8, 7:12 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 63 min |
| Jul 8, 7:13 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 62 min |
| Jul 8, 7:37 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Custer, Powder River | 38 min |
| Jul 8, 8:14 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Custer, Fallon, Powder River | 61 min |
| Jul 8, 8:21 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 38 min |
| Jul 8, 8:50 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 40 min |
| Jul 8, 9:15 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 60 min |
| Jul 11, 5:21 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Stillwater, Yellowstone | 39 min |
| Jul 11, 5:27 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Wheatland | 33 min |
| Jul 11, 5:57 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Stillwater | 33 min |
| Jul 11, 5:59 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley | 31 min |
| Jul 11, 6:19 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Stillwater, Yellowstone | 26 min |
| Jul 11, 6:23 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 37 min |
| Jul 11, 6:26 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley | 19 min |
| Jul 11, 6:57 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 33 min |
| Jul 11, 7:08 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum | 37 min |
| Jul 11, 7:29 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell, Rosebud | 46 min |
| Jul 11, 7:39 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum | 51 min |
| Jul 11, 7:54 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 51 min |
| Jul 11, 8:18 PM MDT | Severe Thunderstorm Warning | BYZ | Wheatland | 30 min |
| Jul 11, 8:53 PM MDT | Severe Thunderstorm Warning | TFX | Judith Basin, Meagher | 37 min |
| Jul 11, 8:58 PM MDT | Severe Thunderstorm Warning | BYZ | Wheatland | 47 min |
| Jul 11, 9:13 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Prairie | 21 min |
| Jul 11, 10:29 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 31 min |
| Jul 12, 4:15 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 60 min |
| Jul 12, 4:35 PM MDT | Severe Thunderstorm Warning | TFX | Madison | 40 min |
| Jul 12, 4:59 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Sheridan | 61 min |
| Jul 12, 6:13 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Jefferson, Madison | 47 min |
| Jul 12, 6:30 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Sheridan | 42 min |
| Jul 12, 6:53 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Jefferson | 23 min |
| Jul 12, 7:11 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt | 20 min |
| Jul 12, 7:30 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Jefferson, Lewis and Clark | 45 min |
| Jul 13, 7:12 AM MDT | Severe Thunderstorm Warning | MSO | Lake, Mineral, Missoula, Sanders | 3 min |
| Jul 13, 2:47 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark | 33 min |
| Jul 13, 3:15 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Judith Basin | 45 min |
| Jul 13, 3:30 PM MDT | Severe Thunderstorm Warning | TFX | Judith Basin | 45 min |
| Jul 13, 4:18 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon, Stillwater, Yellowstone | 57 min |
| Jul 13, 4:29 PM MDT | Severe Thunderstorm Warning | TFX | Fergus, Judith Basin | 26 min |
| Jul 13, 4:53 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Fergus | 37 min |
| Jul 13, 5:01 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 59 min |
| Jul 13, 5:28 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 47 min |
| Jul 13, 5:32 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum, Phillips | 58 min |
| Jul 13, 6:14 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum, Phillips, Valley | 46 min |
| Jul 13, 6:56 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Phillips, Valley | 64 min |
| Jul 13, 7:46 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Valley | 59 min |
| Jul 13, 8:21 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 39 min |
| Jul 13, 8:43 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula, Ravalli | 32 min |
| Jul 13, 8:58 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 37 min |
| Jul 13, 9:13 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula | 32 min |
| Jul 13, 10:21 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 39 min |
| Jul 13, 10:47 PM MDT | Severe Thunderstorm Warning | MSO | Granite | 28 min |
| Jul 13, 11:12 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula, Powell | 26 min |
| Jul 14, 1:47 PM MDT | Severe Thunderstorm Warning | MSO | Missoula, Powell | 28 min |
| Jul 14, 4:02 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 28 min |
| Jul 14, 4:05 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Jefferson | 25 min |
| Jul 14, 4:13 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Teton | 47 min |
| Jul 14, 4:26 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater | 34 min |
| Jul 14, 4:43 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau | 47 min |
| Jul 14, 4:56 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Hill, Liberty | 49 min |
| Jul 14, 5:04 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Judith Basin | 26 min |
| Jul 14, 5:16 PM MDT | Severe Thunderstorm Warning | BYZ | Park, Sweet Grass | 44 min |
| Jul 14, 5:27 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Fergus | 48 min |
| Jul 14, 5:36 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Hill | 39 min |
| Jul 14, 5:38 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater | 37 min |
| Jul 14, 5:42 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Wheatland | 48 min |
| Jul 14, 5:51 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Fergus | 39 min |
| Jul 14, 5:59 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Stillwater, Sweet Grass, Wheatland | 29 min |
| Jul 14, 6:09 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 66 min |
| Jul 14, 6:14 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater, Yellowstone | 61 min |
| Jul 14, 6:24 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Fergus | 51 min |
| Jul 14, 6:30 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum, Phillips | 60 min |
| Jul 14, 7:10 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 36 min |
| Jul 14, 7:11 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 36 min |
| Jul 14, 7:28 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum, Phillips, Valley | 62 min |
| Jul 14, 7:53 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Jefferson | 37 min |
| Jul 14, 8:24 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Prairie, Roosevelt, Valley | 66 min |
| Jul 14, 8:28 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Meagher | 32 min |
| Jul 14, 8:59 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Meagher | 31 min |
| Jul 14, 9:18 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Valley | 57 min |
| Jul 14, 9:33 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Fallon | 57 min |
| Jul 14, 9:54 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie, Wibaux | 66 min |
| Jul 14, 10:27 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Custer, Fallon | 43 min |
| Jul 14, 11:18 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Richland, Wibaux | 30 min |
| Jul 15, 12:02 AM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 58 min |
| Jul 15, 1:43 AM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 62 min |
| Jul 16, 2:14 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 61 min |
| Jul 16, 3:36 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 54 min |
| Jul 16, 4:30 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 60 min |
| Jul 16, 4:31 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Roosevelt, Valley | 59 min |
| Jul 16, 5:25 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 65 min |
| Jul 16, 5:25 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Roosevelt | 65 min |
| Jul 16, 6:16 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Jefferson | 44 min |
| Jul 16, 6:26 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 34 min |
| Jul 16, 6:57 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 63 min |
| Jul 16, 7:40 PM MDT | Severe Thunderstorm Warning | TFX | Jefferson | 50 min |
| Jul 16, 7:48 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 42 min |
| Jul 16, 7:48 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland, Roosevelt | 57 min |
| Jul 16, 8:26 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 22 min |
| Jul 16, 8:44 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland | 22 min |
| Jul 16, 8:48 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Jefferson | 27 min |
| Jul 16, 9:03 PM MDT | Severe Thunderstorm Warning | MSO | Silver Bow | 27 min |
| Jul 18, 11:38 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 37 min |
| Jul 19, 12:12 AM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 29 min |
| Jul 19, 1:05 AM MDT | Severe Thunderstorm Warning | BYZ | Carter | 25 min |
| Jul 19, 9:41 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 64 min |
| Jul 19, 10:28 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 32 min |
| Jul 19, 11:48 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 42 min |
| Jul 23, 6:03 PM MDT | Severe Thunderstorm Warning | MSO | Flathead | 42 min |
| Jul 23, 8:05 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon | 40 min |
| Jul 24, 6:49 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 41 min |
| Jul 24, 8:56 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 49 min |
| Jul 24, 9:36 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 39 min |
| Jul 30, 3:57 PM MDT | Severe Thunderstorm Warning | MSO | Ravalli | 33 min |
| Jul 30, 4:45 PM MDT | Severe Thunderstorm Warning | GGW | McCone | 45 min |
| Jul 30, 5:05 PM MDT | Severe Thunderstorm Warning | MSO | Silver Bow | 25 min |
| Jul 30, 5:11 PM MDT | Severe Thunderstorm Warning | TFX | Jefferson | 45 min |
| Jul 30, 5:34 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone | 56 min |
| Jul 30, 5:43 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie | 62 min |
| Jul 30, 5:57 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 43 min |
| Jul 30, 6:14 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Roosevelt, Valley | 61 min |
| Jul 30, 6:23 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone | 67 min |
| Jul 30, 6:37 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Wibaux | 53 min |
| Jul 30, 7:07 PM MDT | Severe Thunderstorm Warning | GGW | McCone | 53 min |
| Jul 30, 7:10 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Valley | 65 min |
| Jul 30, 7:18 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 57 min |
| Jul 30, 7:30 PM MDT | Severe Thunderstorm Warning | GGW | Prairie | 29 min |
| Jul 30, 7:34 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Fallon | 56 min |
| Jul 30, 7:42 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 63 min |
| Jul 30, 7:49 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone | 56 min |
| Jul 30, 8:10 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Sheridan | 65 min |
| Jul 30, 8:10 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead | 50 min |
| Jul 30, 8:23 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 33 min |
| Jul 30, 8:39 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 36 min |
| Jul 31, 7:25 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 50 min |
| Aug 2, 8:55 PM MDT | Severe Thunderstorm Warning | TFX | Liberty, Toole | 20 min |
| Aug 4, 3:42 AM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 31 min |
| Aug 4, 4:50 AM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River | 40 min |
| Aug 4, 5:29 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Wibaux | 61 min |
| Aug 10, 3:51 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Silver Bow | 24 min |
| Aug 10, 3:54 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula | 36 min |
| Aug 10, 4:02 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon | 31 min |
| Aug 10, 4:15 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Silver Bow | 38 min |
| Aug 10, 4:24 PM MDT | Severe Thunderstorm Warning | TFX | Jefferson | 36 min |
| Aug 10, 4:37 PM MDT | Severe Thunderstorm Warning | MSO | Silver Bow | 23 min |
| Aug 10, 4:38 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula | 22 min |
| Aug 10, 4:42 PM MDT | Severe Thunderstorm Warning | MSO | Mineral | 33 min |
| Aug 10, 4:49 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Sweet Grass, Wheatland | 41 min |
| Aug 10, 4:53 PM MDT | Severe Thunderstorm Warning | MSO | Silver Bow | 22 min |
| Aug 10, 5:13 PM MDT | Severe Thunderstorm Warning | MSO | Mineral | 32 min |
| Aug 10, 5:16 PM MDT | Severe Thunderstorm Warning | TFX | Jefferson | 29 min |
| Aug 10, 5:25 PM MDT | Severe Thunderstorm Warning | TFX | Jefferson, Lewis and Clark | 35 min |
| Aug 10, 5:48 PM MDT | Severe Thunderstorm Warning | TFX | Jefferson | 27 min |
| Aug 10, 6:14 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Jefferson | 31 min |
| Aug 10, 6:16 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Meagher | 29 min |
| Aug 10, 6:20 PM MDT | Severe Thunderstorm Warning | TFX | Meagher | 25 min |
| Aug 10, 6:45 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Meagher | 31 min |
| Aug 10, 6:50 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater | 25 min |
| Aug 10, 7:12 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Gallatin, Meagher | 48 min |
| Aug 10, 7:31 PM MDT | Severe Thunderstorm Warning | TFX | Judith Basin, Meagher | 59 min |
| Aug 10, 7:53 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin, Meagher | 55 min |
| Aug 10, 7:58 PM MDT | Severe Thunderstorm Warning | TFX | Jefferson, Lewis and Clark | 18 min |
| Aug 10, 8:29 PM MDT | Severe Thunderstorm Warning | BYZ | Wheatland | 31 min |
| Aug 10, 8:55 PM MDT | Severe Thunderstorm Warning | BYZ | Wheatland | 29 min |
| Aug 11, 8:13 AM MDT | Severe Thunderstorm Warning | TFX | Jefferson, Lewis and Clark | 32 min |
| Aug 11, 9:06 AM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark | 39 min |
| Aug 11, 11:28 AM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Silver Bow | 21 min |
| Aug 11, 1:17 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead | 43 min |
| Aug 11, 1:26 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead | 31 min |
| Aug 11, 1:53 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead, Madison | 37 min |
| Aug 11, 2:07 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead, Madison | 38 min |
| Aug 11, 2:15 PM MDT | Severe Thunderstorm Warning | BYZ | Park, Sweet Grass | 45 min |
| Aug 11, 2:15 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin, Meagher | 25 min |
| Aug 11, 2:23 PM MDT | Severe Thunderstorm Warning | TFX | Madison | 52 min |
| Aug 11, 2:30 PM MDT | Severe Thunderstorm Warning | MSO | Missoula | 15 min |
| Aug 11, 2:37 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead, Madison | 38 min |
| Aug 11, 2:55 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Stillwater, Sweet Grass, Wheatland | 50 min |
| Aug 11, 3:09 PM MDT | Severe Thunderstorm Warning | MSO | Flathead, Lake | 36 min |
| Aug 11, 3:17 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Gallatin, Jefferson, Madison | 28 min |
| Aug 11, 3:41 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Wheatland | 64 min |
| Aug 11, 3:42 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Gallatin, Meagher | 25 min |
| Aug 11, 3:55 PM MDT | Severe Thunderstorm Warning | BYZ | Sweet Grass, Wheatland | 50 min |
| Aug 11, 4:27 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Wheatland | 63 min |
| Aug 11, 4:32 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 33 min |
| Aug 11, 4:54 PM MDT | Severe Thunderstorm Warning | BYZ | Sweet Grass | 66 min |
| Aug 11, 5:08 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 37 min |
| Aug 11, 5:16 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 59 min |
| Aug 11, 5:54 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater, Sweet Grass | 36 min |
| Aug 11, 5:59 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 31 min |
| Aug 11, 6:06 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum | 54 min |
| Aug 11, 6:25 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 50 min |
| Aug 11, 6:27 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater, Yellowstone | 63 min |
| Aug 11, 6:30 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 60 min |
| Aug 11, 6:35 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Musselshell | 40 min |
| Aug 11, 7:06 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 39 min |
| Aug 11, 7:16 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 59 min |
| Aug 11, 7:25 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Yellowstone | 50 min |
| Aug 11, 7:31 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 59 min |
| Aug 11, 7:32 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 58 min |
| Aug 11, 8:02 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud, Treasure, Yellowstone | 58 min |
| Aug 11, 8:53 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud, Treasure | 52 min |
| Aug 11, 9:40 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 65 min |
| Aug 11, 9:49 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 56 min |
| Aug 14, 4:37 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 38 min |
| Aug 14, 7:05 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 55 min |
| Aug 14, 7:58 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 62 min |
| Aug 14, 8:11 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 64 min |
| Aug 14, 9:43 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Sheridan | 50 min |
| Aug 21, 7:17 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 43 min |
| Aug 21, 7:54 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau | 31 min |
| Aug 22, 6:48 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River, Rosebud | 57 min |
| Aug 22, 6:59 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 46 min |
| Aug 22, 7:25 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Yellowstone | 53 min |
| Aug 22, 7:53 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River, Rosebud | 67 min |
| Aug 22, 8:40 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 65 min |
| Aug 23, 6:55 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 65 min |
| Sep 1, 3:25 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 50 min |
| Sep 1, 4:14 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Custer, Fallon, Powder River | 61 min |
| Sep 2, 8:18 AM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 27 min |
| Sep 2, 9:33 AM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Sheridan | 42 min |
| Sep 2, 9:40 AM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt | 65 min |
| Sep 6, 4:17 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead | 43 min |
| Sep 10, 4:39 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 51 min |
| Sep 10, 8:03 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 42 min |
| Sep 17, 5:45 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Wibaux | 60 min |
| Sep 17, 6:34 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland, Wibaux | 56 min |
| Sep 19, 9:17 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt, Sheridan | 43 min |
| Sep 19, 9:46 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Sheridan | 44 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Big Horn County38
- Powder River County36
- Valley County34
- Carter County32
- Cascade County31
- Fergus County31
- McCone County29
- Chouteau County29
- Rosebud County28
- Roosevelt County26
- Phillips County25
- Garfield County23
- Judith Basin County22
- Jefferson County22
- Dawson County21
- Broadwater County20
- Meagher County20
- Custer County20
- Sheridan County20
- Petroleum County19
- Stillwater County18
- Golden Valley County18
- Yellowstone County18
- Daniels County17
- Prairie County16
- Wheatland County16
- Richland County15
- Blaine County15
- Musselshell County13
- Hill County12
- Carbon County11
- Lewis and Clark County11
- Sweet Grass County10
- Beaverhead County9
- Madison County9
- Gallatin County8
- Wibaux County8
- Granite County8
- Fallon County8
- Missoula County8
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20182020
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.