Alert archive / Montana / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in Montana, 2008
509 severe thunderstorm warnings in 2008. 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 2008. Tap one for its archive.
- Severe Thunderstorm Warnings
- 509
- Busiest month
- July210 severe thunderstorm warnings
- Busiest day
- June 26, 200835 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.
227 of 509 severe thunderstorm warnings covering Montana in 2008 had a qualifying storm report inside them; 317 of 416 hail, wind and damage reports fell inside a warning, on average 23 minutes after it went out.
Montana, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Severe thunderstorm warnings | 509 | 227 | 55% | 416 | 76% | 23 min |
Each office's whole area, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Glasgow, MT: severe thunderstorm warnings | 168 | 69 | 59% | 132 | 77% | 23 min |
| NWS Billings, MT: severe thunderstorm warnings | 187 | 80 | 57% | 140 | 79% | 27 min |
| NWS Great Falls, MT: severe thunderstorm warnings | 141 | 74 | 48% | 141 | 72% | 19 min |
| NWS Missoula, MT: severe thunderstorm warnings | 38 | 11 | 71% | 30 | 67% | 17 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 29, 11:16 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Valley | 38 min |
| May 6, 3:15 PM MDT | Severe Thunderstorm Warning | GGW | McCone | 30 min |
| May 18, 5:39 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Prairie | 66 min |
| May 18, 5:59 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie | 32 min |
| May 20, 5:52 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 38 min |
| May 20, 6:15 PM MDT | Severe Thunderstorm Warning | MSO | Silver Bow | 30 min |
| May 20, 6:43 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin, Madison | 47 min |
| May 20, 7:42 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau | 48 min |
| May 20, 10:23 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Fergus, Hill | 49 min |
| May 20, 11:21 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Granite, Powell, Silver Bow | 39 min |
| May 28, 4:36 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Meagher | 39 min |
| May 29, 4:00 PM MDT | Severe Thunderstorm Warning | TFX | Hill, Liberty | 30 min |
| May 29, 4:43 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Wibaux | 33 min |
| May 29, 5:44 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Hill | 46 min |
| May 30, 3:57 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Fergus | 48 min |
| May 30, 4:59 PM MDT | Severe Thunderstorm Warning | TFX | Fergus, Judith Basin | 46 min |
| May 30, 7:16 PM MDT | Severe Thunderstorm Warning | TFX | Jefferson, Lewis and Clark | 31 min |
| May 31, 5:37 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 53 min |
| May 31, 7:51 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 24 min |
| May 31, 10:01 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 59 min |
| Jun 1, 1:43 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 47 min |
| Jun 1, 2:01 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 44 min |
| Jun 1, 2:29 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 46 min |
| Jun 1, 2:30 PM MDT | Severe Thunderstorm Warning | TFX | Fergus, Judith Basin | 45 min |
| Jun 1, 2:42 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 33 min |
| Jun 1, 3:13 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 62 min |
| Jun 1, 3:48 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 57 min |
| Jun 1, 4:12 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 63 min |
| Jun 1, 4:16 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 59 min |
| Jun 1, 4:41 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell, Rosebud, Treasure, Yellowstone | 64 min |
| Jun 1, 4:57 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 48 min |
| Jun 1, 5:14 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 61 min |
| Jun 1, 5:51 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 39 min |
| Jun 1, 6:06 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud, Treasure | 54 min |
| Jun 1, 6:57 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 48 min |
| Jun 1, 7:41 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 34 min |
| Jun 1, 8:15 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 39 min |
| Jun 2, 3:41 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Hill | 49 min |
| Jun 2, 4:07 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater, Sweet Grass | 53 min |
| Jun 2, 4:47 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 58 min |
| Jun 2, 5:04 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 56 min |
| Jun 2, 5:39 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Fergus, Hill, Judith Basin, Liberty | 53 min |
| Jun 2, 5:55 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Carbon, Yellowstone | 47 min |
| Jun 2, 6:50 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Yellowstone | 55 min |
| Jun 2, 7:42 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 63 min |
| Jun 2, 8:43 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 62 min |
| Jun 2, 9:42 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Powder River | 33 min |
| Jun 10, 12:23 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 67 min |
| Jun 10, 1:59 PM MDT | Severe Thunderstorm Warning | TFX | Judith Basin | 46 min |
| Jun 10, 2:23 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 67 min |
| Jun 10, 2:29 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Wheatland | 61 min |
| Jun 10, 2:29 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 61 min |
| Jun 10, 2:57 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Musselshell | 63 min |
| Jun 10, 3:18 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 41 min |
| Jun 10, 3:44 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Carbon, Musselshell, Yellowstone | 61 min |
| Jun 10, 3:57 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell, Yellowstone | 53 min |
| Jun 10, 4:21 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum | 39 min |
| Jun 10, 4:56 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum, Phillips | 64 min |
| Jun 10, 5:35 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum, Phillips | 55 min |
| Jun 10, 6:07 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 41 min |
| Jun 13, 2:09 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland | 51 min |
| Jun 13, 2:19 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 56 min |
| Jun 13, 2:34 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 56 min |
| Jun 13, 2:53 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Richland, Roosevelt, Valley | 67 min |
| Jun 13, 3:33 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Valley | 42 min |
| Jun 14, 12:03 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Sheridan | 57 min |
| Jun 14, 12:20 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Sheridan | 55 min |
| Jun 14, 12:54 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Sheridan | 42 min |
| Jun 14, 1:23 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 34 min |
| Jun 16, 3:08 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 52 min |
| Jun 16, 3:42 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 50 min |
| Jun 16, 5:18 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 36 min |
| Jun 16, 5:22 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 38 min |
| Jun 16, 5:46 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 48 min |
| Jun 16, 6:05 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 40 min |
| Jun 16, 6:09 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 51 min |
| Jun 16, 6:26 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell, Yellowstone | 64 min |
| Jun 16, 6:55 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 65 min |
| Jun 16, 7:46 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 59 min |
| Jun 16, 8:02 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 58 min |
| Jun 16, 8:17 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 28 min |
| Jun 16, 8:34 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 56 min |
| Jun 16, 10:49 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 26 min |
| Jun 16, 10:54 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 54 min |
| Jun 16, 11:14 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 31 min |
| Jun 17, 12:59 PM MDT | Severe Thunderstorm Warning | GGW | Wibaux | 46 min |
| Jun 17, 3:42 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum | 63 min |
| Jun 17, 5:09 PM MDT | Severe Thunderstorm Warning | TFX | Liberty, Toole | 51 min |
| Jun 17, 5:47 PM MDT | Severe Thunderstorm Warning | TFX | Hill, Liberty | 43 min |
| Jun 17, 5:54 PM MDT | Severe Thunderstorm Warning | TFX | Liberty, Toole | 36 min |
| Jun 17, 5:57 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 33 min |
| Jun 17, 6:29 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Hill, Liberty | 46 min |
| Jun 17, 6:29 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 16 min |
| Jun 17, 6:55 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Wheatland | 65 min |
| Jun 17, 7:12 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 63 min |
| Jun 17, 7:31 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Musselshell | 29 min |
| Jun 17, 8:03 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell, Treasure, Yellowstone | 57 min |
| Jun 17, 8:05 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Musselshell | 31 min |
| Jun 17, 8:24 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 66 min |
| Jun 17, 8:33 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell, Treasure, Yellowstone | 22 min |
| Jun 17, 8:44 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Wheatland | 15 min |
| Jun 17, 9:11 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum, Phillips | 64 min |
| Jun 17, 10:05 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 44 min |
| Jun 17, 10:07 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 23 min |
| Jun 17, 10:29 PM MDT | Severe Thunderstorm Warning | BYZ | Treasure, Yellowstone | 61 min |
| Jun 17, 10:34 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 41 min |
| Jun 17, 10:43 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 47 min |
| Jun 17, 10:52 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 38 min |
| Jun 17, 11:09 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud, Treasure | 66 min |
| Jun 17, 11:26 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 31 min |
| Jun 17, 11:29 PM MDT | Severe Thunderstorm Warning | BYZ | Treasure | 31 min |
| Jun 17, 11:49 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 56 min |
| Jun 18, 12:27 AM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 48 min |
| Jun 18, 12:41 AM MDT | Severe Thunderstorm Warning | BYZ | Powder River, Rosebud | 64 min |
| Jun 18, 12:47 AM MDT | Severe Thunderstorm Warning | GGW | Daniels, Valley | 43 min |
| Jun 18, 1:14 AM MDT | Severe Thunderstorm Warning | BYZ | Treasure, Yellowstone | 61 min |
| Jun 18, 1:33 AM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 46 min |
| Jun 18, 3:58 AM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud, Treasure | 62 min |
| Jun 18, 3:37 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt | 23 min |
| Jun 18, 4:17 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 73 min |
| Jun 18, 7:49 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Carbon | 56 min |
| Jun 18, 8:02 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Yellowstone | 58 min |
| Jun 18, 8:42 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 78 min |
| Jun 18, 8:53 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Treasure, Yellowstone | 67 min |
| Jun 18, 9:58 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 62 min |
| Jun 19, 2:25 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River, Rosebud | 51 min |
| Jun 19, 2:53 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 82 min |
| Jun 19, 3:21 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 34 min |
| Jun 19, 3:59 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 61 min |
| Jun 19, 4:15 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 60 min |
| Jun 19, 8:25 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 65 min |
| Jun 21, 6:09 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead, Madison | 51 min |
| Jun 22, 4:31 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead, Gallatin, Madison | 89 min |
| Jun 22, 5:26 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Prairie | 64 min |
| Jun 22, 5:47 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Dawson, McCone, Richland, Roosevelt, Valley | 58 min |
| Jun 22, 7:02 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie | 29 min |
| Jun 22, 7:08 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 67 min |
| Jun 22, 7:11 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland, Roosevelt | 64 min |
| Jun 22, 8:15 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 60 min |
| Jun 22, 8:15 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland | 36 min |
| Jun 22, 9:06 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 54 min |
| Jun 22, 9:58 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 62 min |
| Jun 23, 2:47 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 28 min |
| Jun 23, 2:48 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 27 min |
| Jun 23, 2:59 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 46 min |
| Jun 23, 3:30 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 60 min |
| Jun 23, 4:11 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 64 min |
| Jun 24, 5:15 AM MDT | Severe Thunderstorm Warning | TFX | Fergus | 45 min |
| Jun 24, 1:13 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland, Wibaux | 32 min |
| Jun 25, 2:48 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 27 min |
| Jun 25, 3:08 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 67 min |
| Jun 25, 5:54 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 54 min |
| Jun 25, 6:05 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater, Sweet Grass | 40 min |
| Jun 25, 6:57 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 53 min |
| Jun 25, 7:06 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon, Stillwater | 54 min |
| Jun 25, 7:12 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River, Rosebud | 48 min |
| Jun 25, 7:49 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River, Rosebud | 41 min |
| Jun 25, 7:53 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon | 37 min |
| Jun 25, 8:06 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon, Golden Valley, Stillwater, Sweet Grass, Yellowstone | 47 min |
| Jun 25, 8:26 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Carbon | 64 min |
| Jun 25, 8:27 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River | 36 min |
| Jun 25, 8:47 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Musselshell, Stillwater, Yellowstone | 37 min |
| Jun 25, 9:13 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie | 62 min |
| Jun 25, 9:22 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 53 min |
| Jun 25, 9:51 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 46 min |
| Jun 25, 10:06 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 54 min |
| Jun 25, 10:11 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie | 33 min |
| Jun 25, 10:25 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 65 min |
| Jun 25, 10:46 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Sheridan | 29 min |
| Jun 25, 10:57 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 63 min |
| Jun 25, 11:09 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 66 min |
| Jun 26, 12:11 AM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 59 min |
| Jun 26, 12:29 AM MDT | Severe Thunderstorm Warning | TFX | Fergus | 61 min |
| Jun 26, 5:53 AM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 67 min |
| Jun 26, 6:59 AM MDT | Severe Thunderstorm Warning | GGW | Valley | 61 min |
| Jun 26, 9:12 AM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Valley | 63 min |
| Jun 26, 9:51 AM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Sheridan | 54 min |
| Jun 26, 10:35 AM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt | 55 min |
| Jun 26, 11:40 AM MDT | Severe Thunderstorm Warning | GGW | Roosevelt | 35 min |
| Jun 26, 12:05 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 22 min |
| Jun 26, 12:23 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Wibaux | 67 min |
| Jun 26, 1:36 PM MDT | Severe Thunderstorm Warning | GGW | Wibaux | 24 min |
| Jun 26, 3:29 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 61 min |
| Jun 26, 4:51 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Valley | 54 min |
| Jun 26, 4:59 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland | 61 min |
| Jun 26, 5:23 PM MDT | Severe Thunderstorm Warning | GGW | Dawson | 67 min |
| Jun 26, 5:45 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Valley | 45 min |
| Jun 26, 6:01 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland | 29 min |
| Jun 26, 6:23 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland, Wibaux | 67 min |
| Jun 26, 7:28 PM MDT | Severe Thunderstorm Warning | GGW | Wibaux | 32 min |
| Jun 26, 10:33 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 57 min |
| Jun 27, 12:06 AM MDT | Severe Thunderstorm Warning | BYZ | Carter | 54 min |
| Jul 1, 1:34 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead, Madison | 41 min |
| Jul 1, 2:19 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin, Madison | 41 min |
| Jul 1, 3:23 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater | 37 min |
| Jul 1, 4:27 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 48 min |
| Jul 1, 4:33 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 33 min |
| Jul 1, 6:43 PM MDT | Severe Thunderstorm Warning | MSO | Lincoln | 30 min |
| Jul 1, 8:27 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 48 min |
| Jul 1, 9:10 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Powell | 44 min |
| Jul 4, 1:03 PM MDT | Severe Thunderstorm Warning | TFX | Glacier | 27 min |
| Jul 4, 3:50 PM MDT | Severe Thunderstorm Warning | MSO | Flathead | 25 min |
| Jul 4, 3:50 PM MDT | Severe Thunderstorm Warning | TFX | Pondera | 40 min |
| Jul 4, 3:56 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 49 min |
| Jul 4, 4:10 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Fergus, Judith Basin | 50 min |
| Jul 4, 4:10 PM MDT | Severe Thunderstorm Warning | TFX | Judith Basin, Meagher | 25 min |
| Jul 4, 4:27 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 26 min |
| Jul 4, 4:37 PM MDT | Severe Thunderstorm Warning | MSO | Flathead | 38 min |
| Jul 4, 4:38 PM MDT | Severe Thunderstorm Warning | TFX | Judith Basin | 67 min |
| Jul 4, 4:48 PM MDT | Severe Thunderstorm Warning | TFX | Pondera, Teton | 42 min |
| Jul 4, 4:57 PM MDT | Severe Thunderstorm Warning | TFX | Glacier | 48 min |
| Jul 4, 4:58 PM MDT | Severe Thunderstorm Warning | MSO | Flathead, Lake, Missoula, Sanders | 47 min |
| Jul 4, 5:06 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Meagher | 39 min |
| Jul 4, 5:08 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark | 52 min |
| Jul 4, 5:13 PM MDT | Severe Thunderstorm Warning | TFX | Glacier, Pondera | 47 min |
| Jul 4, 5:18 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 40 min |
| Jul 4, 5:23 PM MDT | Severe Thunderstorm Warning | TFX | Fergus, Judith Basin | 34 min |
| Jul 4, 5:26 PM MDT | Severe Thunderstorm Warning | TFX | Pondera, Toole | 49 min |
| Jul 4, 5:38 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark, Teton | 52 min |
| Jul 4, 5:40 PM MDT | Severe Thunderstorm Warning | MSO | Flathead, Lake, Missoula, Powell | 48 min |
| Jul 4, 5:45 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Meagher | 45 min |
| Jul 4, 5:52 PM MDT | Severe Thunderstorm Warning | TFX | Glacier | 38 min |
| Jul 4, 5:57 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark, Teton | 63 min |
| Jul 4, 6:02 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Fergus, Judith Basin | 43 min |
| Jul 4, 6:07 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Judith Basin | 38 min |
| Jul 4, 6:12 PM MDT | Severe Thunderstorm Warning | TFX | Glacier, Pondera, Teton, Toole | 48 min |
| Jul 4, 6:27 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Judith Basin, Lewis and Clark, Teton | 48 min |
| Jul 4, 6:28 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 43 min |
| Jul 4, 6:29 PM MDT | Severe Thunderstorm Warning | TFX | Glacier | 31 min |
| Jul 4, 6:32 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 43 min |
| Jul 4, 6:47 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Judith Basin | 25 min |
| Jul 4, 6:54 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum, Phillips | 66 min |
| Jul 4, 6:58 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Fergus, Judith Basin, Teton | 47 min |
| Jul 4, 7:00 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Pondera, Teton | 45 min |
| Jul 4, 7:04 PM MDT | Severe Thunderstorm Warning | TFX | Pondera, Teton, Toole | 28 min |
| Jul 4, 7:27 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Granite, Powell | 48 min |
| Jul 4, 7:38 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Lewis and Clark, Liberty, Pondera, Teton, Toole | 52 min |
| Jul 4, 7:42 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Hill, Liberty | 63 min |
| Jul 4, 7:57 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Phillips, Valley | 24 min |
| Jul 4, 8:08 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Phillips, Valley | 37 min |
| Jul 4, 8:08 PM MDT | Severe Thunderstorm Warning | TFX | Hill, Liberty | 67 min |
| Jul 4, 8:10 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Granite, Powell | 50 min |
| Jul 4, 8:21 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 39 min |
| Jul 4, 8:27 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Granite, Powell | 48 min |
| Jul 4, 8:36 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 39 min |
| Jul 4, 8:43 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Hill | 32 min |
| Jul 4, 9:15 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone | 35 min |
| Jul 4, 9:15 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 45 min |
| Jul 4, 9:57 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Silver Bow | 48 min |
| Jul 4, 10:40 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 65 min |
| Jul 5, 3:52 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud, Treasure | 41 min |
| Jul 5, 5:19 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River, Rosebud | 56 min |
| Jul 5, 6:09 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 66 min |
| Jul 5, 7:11 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 19 min |
| Jul 5, 7:22 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 53 min |
| Jul 5, 7:34 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River, Rosebud | 56 min |
| Jul 6, 1:46 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River, Rosebud | 59 min |
| Jul 6, 2:44 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River, Rosebud | 45 min |
| Jul 6, 3:30 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River, Rosebud | 60 min |
| Jul 6, 4:28 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River, Rosebud | 62 min |
| Jul 6, 5:35 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 55 min |
| Jul 6, 6:24 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 48 min |
| Jul 6, 6:40 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Powder River, Rosebud | 65 min |
| Jul 6, 7:45 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 32 min |
| Jul 7, 10:20 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 70 min |
| Jul 7, 11:22 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 38 min |
| Jul 10, 12:17 AM MDT | Severe Thunderstorm Warning | GGW | Daniels, Sheridan | 58 min |
| Jul 10, 9:34 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Sheridan | 21 min |
| Jul 16, 3:18 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon, Stillwater | 42 min |
| Jul 16, 5:59 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 61 min |
| Jul 16, 6:51 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Powder River, Rosebud | 54 min |
| Jul 16, 8:05 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum, Phillips | 27 min |
| Jul 16, 8:18 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 57 min |
| Jul 17, 11:24 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Judith Basin, Meagher | 36 min |
| Jul 18, 2:06 AM MDT | Severe Thunderstorm Warning | TFX | Hill, Liberty | 24 min |
| Jul 18, 3:11 AM MDT | Severe Thunderstorm Warning | TFX | Hill | 34 min |
| Jul 18, 3:48 AM MDT | Severe Thunderstorm Warning | TFX | Hill | 42 min |
| Jul 18, 12:00 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 60 min |
| Jul 18, 1:21 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 54 min |
| Jul 18, 1:30 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Fallon | 45 min |
| Jul 18, 1:51 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 39 min |
| Jul 18, 2:12 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Phillips | 45 min |
| Jul 18, 2:13 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 62 min |
| Jul 18, 2:29 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 61 min |
| Jul 18, 2:52 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 53 min |
| Jul 18, 2:59 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 61 min |
| Jul 18, 3:11 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Custer, Fallon | 64 min |
| Jul 18, 3:12 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 48 min |
| Jul 18, 3:42 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 63 min |
| Jul 18, 3:49 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin | 41 min |
| Jul 18, 3:52 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 28 min |
| Jul 18, 4:12 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Fallon | 33 min |
| Jul 18, 4:33 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River, Rosebud | 72 min |
| Jul 18, 5:39 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 54 min |
| Jul 19, 6:25 AM MDT | Severe Thunderstorm Warning | GGW | Valley | 53 min |
| Jul 19, 9:49 AM MDT | Severe Thunderstorm Warning | GGW | Daniels | 56 min |
| Jul 19, 10:32 AM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Sheridan | 58 min |
| Jul 19, 11:30 AM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Sheridan | 60 min |
| Jul 19, 12:10 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt | 65 min |
| Jul 19, 12:29 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Sheridan | 16 min |
| Jul 19, 4:11 PM MDT | Severe Thunderstorm Warning | GGW | Daniels | 64 min |
| Jul 19, 5:11 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Sheridan | 64 min |
| Jul 19, 6:07 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Sheridan | 41 min |
| Jul 20, 4:42 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Wibaux | 48 min |
| Jul 20, 5:16 PM MDT | Severe Thunderstorm Warning | GGW | Wibaux | 29 min |
| Jul 22, 2:11 PM MDT | Severe Thunderstorm Warning | MSO | Ravalli | 64 min |
| Jul 22, 3:04 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin | 26 min |
| Jul 22, 3:20 PM MDT | Severe Thunderstorm Warning | BYZ | Park | 31 min |
| Jul 22, 3:38 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead, Madison | 67 min |
| Jul 22, 4:48 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 33 min |
| Jul 22, 4:52 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 53 min |
| Jul 22, 4:53 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin, Madison | 67 min |
| Jul 22, 4:57 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Roosevelt | 63 min |
| Jul 22, 5:44 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 61 min |
| Jul 22, 5:55 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Stillwater, Sweet Grass | 54 min |
| Jul 22, 5:59 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin | 48 min |
| Jul 22, 6:15 PM MDT | Severe Thunderstorm Warning | BYZ | Park | 60 min |
| Jul 22, 6:24 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt | 66 min |
| Jul 22, 7:00 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Sheridan | 24 min |
| Jul 22, 7:09 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Sheridan | 66 min |
| Jul 22, 7:20 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 55 min |
| Jul 22, 7:38 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Sheridan | 52 min |
| Jul 22, 7:59 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Valley | 61 min |
| Jul 22, 8:13 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Sheridan | 62 min |
| Jul 22, 8:51 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Sheridan | 39 min |
| Jul 22, 8:55 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Yellowstone | 65 min |
| Jul 22, 9:14 PM MDT | Severe Thunderstorm Warning | GGW | Daniels | 46 min |
| Jul 22, 9:34 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 26 min |
| Jul 22, 9:35 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt | 55 min |
| Jul 22, 9:54 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud, Treasure, Yellowstone | 66 min |
| Jul 22, 10:28 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt | 37 min |
| Jul 22, 10:58 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Custer, Powder River, Rosebud | 62 min |
| Jul 22, 11:35 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Sheridan | 55 min |
| Jul 22, 11:56 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River, Rosebud | 49 min |
| Jul 23, 12:09 AM MDT | Severe Thunderstorm Warning | GGW | McCone, Prairie | 66 min |
| Jul 23, 12:28 AM MDT | Severe Thunderstorm Warning | GGW | Daniels, Sheridan | 62 min |
| Jul 23, 12:48 AM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone | 42 min |
| Jul 23, 1:21 AM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland | 54 min |
| Jul 23, 6:44 PM MDT | Severe Thunderstorm Warning | MSO | Ravalli | 32 min |
| Jul 23, 7:59 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 39 min |
| Jul 23, 8:16 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater, Sweet Grass | 37 min |
| Jul 23, 8:16 PM MDT | Severe Thunderstorm Warning | MSO | Missoula | 29 min |
| Jul 23, 8:54 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark | 51 min |
| Jul 23, 9:36 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark, Meagher | 54 min |
| Jul 23, 10:19 PM MDT | Severe Thunderstorm Warning | TFX | Pondera, Teton | 41 min |
| Jul 23, 10:25 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Judith Basin, Meagher | 50 min |
| Jul 23, 10:55 PM MDT | Severe Thunderstorm Warning | TFX | Pondera, Toole | 50 min |
| Jul 23, 11:45 PM MDT | Severe Thunderstorm Warning | TFX | Toole | 30 min |
| Jul 24, 12:28 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 62 min |
| Jul 24, 1:21 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 39 min |
| Jul 24, 2:00 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Phillips, Valley | 60 min |
| Jul 24, 3:32 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum | 36 min |
| Jul 24, 3:42 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 32 min |
| Jul 24, 4:26 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 49 min |
| Jul 24, 6:44 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt, Sheridan | 52 min |
| Jul 24, 8:22 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 53 min |
| Jul 26, 8:55 AM MDT | Severe Thunderstorm Warning | TFX | Glacier, Pondera, Toole | 50 min |
| Jul 26, 10:34 AM MDT | Severe Thunderstorm Warning | TFX | Toole | 41 min |
| Jul 26, 11:48 AM MDT | Severe Thunderstorm Warning | TFX | Toole | 42 min |
| Jul 26, 12:20 PM MDT | Severe Thunderstorm Warning | TFX | Hill, Liberty, Toole | 40 min |
| Jul 26, 1:57 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 48 min |
| Jul 26, 2:16 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 59 min |
| Jul 26, 3:17 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 58 min |
| Jul 26, 3:49 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 26 min |
| Jul 26, 3:57 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 40 min |
| Jul 26, 4:14 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 31 min |
| Jul 26, 4:34 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 56 min |
| Jul 26, 4:39 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 66 min |
| Jul 26, 5:01 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 26 min |
| Jul 26, 5:27 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 63 min |
| Jul 26, 6:25 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum | 37 min |
| Jul 26, 6:29 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Phillips, Valley | 61 min |
| Jul 26, 6:41 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Valley | 64 min |
| Jul 26, 7:55 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt | 50 min |
| Jul 26, 8:29 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland | 61 min |
| Jul 26, 8:52 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 53 min |
| Jul 26, 8:57 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 63 min |
| Jul 26, 9:16 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 59 min |
| Jul 26, 9:21 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 54 min |
| Jul 26, 9:32 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland | 58 min |
| Jul 26, 9:48 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Yellowstone | 57 min |
| Jul 26, 9:50 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland, Wibaux | 55 min |
| Jul 26, 9:53 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 67 min |
| Jul 26, 10:21 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Fallon | 54 min |
| Jul 26, 10:22 PM MDT | Severe Thunderstorm Warning | GGW | Prairie | 53 min |
| Jul 26, 10:37 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud, Treasure | 53 min |
| Jul 26, 10:39 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Wibaux | 66 min |
| Jul 26, 11:09 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Fallon | 66 min |
| Jul 26, 11:09 PM MDT | Severe Thunderstorm Warning | GGW | Wibaux | 66 min |
| Jul 27, 12:15 AM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 30 min |
| Jul 27, 1:12 AM MDT | Severe Thunderstorm Warning | BYZ | Carter, Custer, Fallon | 30 min |
| Jul 27, 1:27 AM MDT | Severe Thunderstorm Warning | GGW | Garfield | 63 min |
| Jul 27, 2:07 AM MDT | Severe Thunderstorm Warning | GGW | Garfield, Valley | 25 min |
| Jul 27, 4:46 AM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 33 min |
| Jul 28, 1:31 AM MDT | Severe Thunderstorm Warning | TFX | Fergus | 44 min |
| Jul 28, 1:55 AM MDT | Severe Thunderstorm Warning | GGW | Garfield | 65 min |
| Jul 28, 2:38 AM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 38 min |
| Jul 28, 2:57 AM MDT | Severe Thunderstorm Warning | GGW | Garfield | 63 min |
| Jul 28, 3:04 AM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Valley | 56 min |
| Jul 28, 4:05 AM MDT | Severe Thunderstorm Warning | GGW | McCone, Richland, Roosevelt | 55 min |
| Jul 28, 4:57 AM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt, Sheridan | 48 min |
| Jul 30, 5:04 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Sheridan | 56 min |
| Aug 1, 11:44 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland | 61 min |
| Aug 2, 12:19 AM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt | 56 min |
| Aug 2, 5:34 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Meagher | 41 min |
| Aug 2, 7:28 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 47 min |
| Aug 2, 9:11 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 64 min |
| Aug 2, 9:57 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell, Rosebud, Treasure, Yellowstone | 63 min |
| Aug 2, 10:23 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 30 min |
| Aug 2, 10:51 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 54 min |
| Aug 2, 11:33 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 57 min |
| Aug 2, 11:41 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Fallon | 64 min |
| Aug 3, 12:20 AM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Wibaux | 55 min |
| Aug 3, 12:31 AM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 28 min |
| Aug 3, 1:13 AM MDT | Severe Thunderstorm Warning | GGW | Wibaux | 32 min |
| Aug 3, 9:21 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 54 min |
| Aug 3, 9:56 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River, Rosebud | 64 min |
| Aug 3, 10:12 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 63 min |
| Aug 3, 11:00 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Custer, Fallon | 60 min |
| Aug 3, 11:09 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River, Rosebud | 66 min |
| Aug 3, 11:28 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 62 min |
| Aug 4, 12:27 AM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 63 min |
| Aug 4, 1:27 AM MDT | Severe Thunderstorm Warning | BYZ | Carter | 48 min |
| Aug 5, 4:23 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 67 min |
| Aug 5, 4:50 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 25 min |
| Aug 5, 4:55 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River | 65 min |
| Aug 5, 5:03 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 57 min |
| Aug 5, 5:23 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 33 min |
| Aug 5, 5:45 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 60 min |
| Aug 5, 5:55 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 30 min |
| Aug 5, 6:05 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 55 min |
| Aug 5, 6:51 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 46 min |
| Aug 5, 7:04 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell, Rosebud | 56 min |
| Aug 5, 7:37 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud, Treasure | 53 min |
| Aug 5, 8:21 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud, Treasure | 54 min |
| Aug 7, 4:33 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau | 27 min |
| Aug 7, 8:43 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 47 min |
| Aug 8, 2:52 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead, Gallatin, Madison | 53 min |
| Aug 8, 3:43 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin, Madison | 47 min |
| Aug 8, 4:29 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin | 46 min |
| Aug 8, 4:36 PM MDT | Severe Thunderstorm Warning | BYZ | Park | 54 min |
| Aug 8, 5:01 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 44 min |
| Aug 8, 5:54 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 36 min |
| Aug 8, 6:22 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 53 min |
| Aug 9, 11:45 AM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula, Ravalli | 30 min |
| Aug 9, 12:15 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula, Ravalli | 16 min |
| Aug 9, 12:32 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula, Powell | 28 min |
| Aug 9, 12:40 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead, Madison | 65 min |
| Aug 9, 1:15 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin, Madison | 46 min |
| Aug 9, 1:42 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead | 63 min |
| Aug 9, 2:00 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark | 45 min |
| Aug 9, 2:13 PM MDT | Severe Thunderstorm Warning | BYZ | Park | 60 min |
| Aug 9, 2:33 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 42 min |
| Aug 9, 2:34 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin, Madison | 56 min |
| Aug 9, 2:52 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Teton | 38 min |
| Aug 9, 2:54 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead | 66 min |
| Aug 9, 3:00 PM MDT | Severe Thunderstorm Warning | TFX | Pondera, Teton | 45 min |
| Aug 9, 3:31 PM MDT | Severe Thunderstorm Warning | TFX | Glacier, Pondera, Toole | 59 min |
| Aug 9, 3:35 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Liberty, Pondera, Teton, Toole | 55 min |
| Aug 9, 3:59 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead, Madison | 46 min |
| Aug 9, 4:05 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 55 min |
| Aug 9, 4:44 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin, Madison | 61 min |
| Aug 9, 5:11 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead | 49 min |
| Aug 9, 5:30 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula, Powell | 45 min |
| Aug 9, 5:51 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 54 min |
| Aug 9, 5:51 PM MDT | Severe Thunderstorm Warning | TFX | Madison | 39 min |
| Aug 9, 5:59 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 49 min |
| Aug 9, 6:06 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 54 min |
| Aug 9, 6:30 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin, Madison | 60 min |
| Aug 9, 6:38 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Phillips, Valley | 67 min |
| Aug 9, 6:48 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 57 min |
| Aug 9, 7:05 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum, Phillips | 34 min |
| Aug 9, 7:38 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 67 min |
| Aug 9, 8:30 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 29 min |
| Aug 9, 9:57 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Prairie | 48 min |
| Aug 9, 11:53 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin | 15 min |
| Aug 10, 1:00 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 60 min |
| Aug 10, 1:58 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 31 min |
| Aug 10, 2:54 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 64 min |
| Aug 10, 3:34 PM MDT | Severe Thunderstorm Warning | GGW | Wibaux | 43 min |
| Aug 10, 3:55 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Valley | 65 min |
| Aug 10, 4:06 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River | 44 min |
| Aug 10, 4:34 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 56 min |
| Aug 10, 5:27 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 53 min |
| Aug 10, 5:45 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Sheridan | 50 min |
| Aug 10, 6:25 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 65 min |
| Aug 10, 6:53 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Sheridan | 67 min |
| Aug 10, 7:33 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Sheridan | 57 min |
| Aug 10, 8:26 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Sheridan | 27 min |
| Aug 10, 9:26 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 64 min |
| Aug 11, 12:45 AM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Valley | 39 min |
| Aug 19, 1:30 PM MDT | Severe Thunderstorm Warning | MSO | Missoula, Sanders | 30 min |
| Aug 19, 2:00 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 45 min |
| Aug 19, 2:03 PM MDT | Severe Thunderstorm Warning | MSO | Lake, Missoula, Sanders | 42 min |
| Aug 19, 2:32 PM MDT | Severe Thunderstorm Warning | TFX | Glacier | 43 min |
| Aug 19, 5:47 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 58 min |
| Aug 19, 6:47 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula, Powell | 43 min |
| Aug 21, 4:38 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 20 min |
| Aug 21, 8:00 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Wibaux | 60 min |
| Aug 30, 11:48 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Granite, Powell | 42 min |
| Aug 31, 12:07 AM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Teton | 38 min |
| Aug 31, 12:24 AM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Granite, Powell | 25 min |
| Aug 31, 12:48 AM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Liberty, Pondera, Teton | 42 min |
| Aug 31, 3:53 AM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Powell | 41 min |
| Aug 31, 2:07 PM MDT | Severe Thunderstorm Warning | MSO | Powell, Silver Bow | 8 min |
| Aug 31, 3:19 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Powell | 13 min |
| Aug 31, 3:37 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead | 38 min |
| Aug 31, 3:49 PM MDT | Severe Thunderstorm Warning | MSO | Silver Bow | 41 min |
| Aug 31, 4:01 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Judith Basin, Meagher | 44 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Powder River County50
- Big Horn County46
- Rosebud County42
- Valley County36
- Roosevelt County34
- Garfield County31
- Dawson County29
- Phillips County29
- Richland County29
- Sheridan County29
- Carter County28
- Daniels County26
- Yellowstone County25
- Chouteau County24
- Fergus County24
- Hill County24
- Custer County23
- McCone County22
- Cascade County22
- Blaine County21
- Musselshell County18
- Lewis and Clark County17
- Prairie County16
- Madison County16
- Powell County16
- Wibaux County16
- Judith Basin County16
- Treasure County16
- Gallatin County15
- Petroleum County15
- Pondera County15
- Teton County15
- Toole County14
- Liberty County13
- Granite County12
- Beaverhead County11
- Missoula County10
- Deer Lodge County9
- Meagher County9
- Stillwater County9
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20072009
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.