Alert archive / Montana / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in Montana, 2015
190 severe thunderstorm warnings in 2015. 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 2015. Tap one for its archive.
- Severe Thunderstorm Warnings
- 190
- Busiest month
- June91 severe thunderstorm warnings
- Busiest day
- June 19, 201530 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.
110 of 190 severe thunderstorm warnings covering Montana in 2015 had a qualifying storm report inside them; 201 of 303 hail, wind and damage reports fell inside a warning, on average 23 minutes after it went out.
Montana, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Severe thunderstorm warnings | 190 | 110 | 42% | 303 | 66% | 23 min |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Glasgow, MT: severe thunderstorm warnings | 65 | 39 | 40% | 86 | 72% | 24 min |
| NWS Missoula, MT: severe thunderstorm warnings | 19 | 8 | 58% | 18 | 67% | 14 min |
| NWS Great Falls, MT: severe thunderstorm warnings | 20 | 6 | 70% | 39 | 26% | 23 min |
| NWS Billings, MT: severe thunderstorm warnings | 91 | 58 | 36% | 169 | 71% | 23 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 16, 6:38 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Treasure | 52 min |
| May 30, 2:27 PM MDT | Severe Thunderstorm Warning | MSO | Mineral, Sanders | 33 min |
| May 30, 2:59 PM MDT | Severe Thunderstorm Warning | MSO | Mineral, Sanders | 31 min |
| May 30, 3:42 PM MDT | Severe Thunderstorm Warning | MSO | Mineral, Missoula | 33 min |
| Jun 1, 3:36 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Gallatin, Jefferson | 39 min |
| Jun 1, 3:47 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 28 min |
| Jun 1, 4:57 PM MDT | Severe Thunderstorm Warning | TFX | Meagher | 48 min |
| Jun 1, 5:01 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Meagher | 29 min |
| Jun 1, 5:07 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon | 23 min |
| Jun 1, 5:45 PM MDT | Severe Thunderstorm Warning | BYZ | Wheatland | 45 min |
| Jun 1, 6:29 PM MDT | Severe Thunderstorm Warning | BYZ | Wheatland | 22 min |
| Jun 1, 9:52 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Custer, Powder River | 23 min |
| Jun 2, 12:32 AM MDT | Severe Thunderstorm Warning | GGW | Wibaux | 58 min |
| Jun 2, 5:33 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 57 min |
| Jun 2, 6:18 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 17 min |
| Jun 2, 7:08 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater, Yellowstone | 37 min |
| Jun 3, 11:55 PM MDT | Severe Thunderstorm Warning | BYZ | Sweet Grass | 65 min |
| Jun 4, 5:49 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 26 min |
| Jun 4, 6:12 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 33 min |
| Jun 5, 5:08 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River | 67 min |
| Jun 5, 5:28 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 47 min |
| Jun 5, 6:18 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 57 min |
| Jun 5, 6:29 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 46 min |
| Jun 5, 7:13 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 37 min |
| Jun 9, 6:58 PM MDT | Severe Thunderstorm Warning | MSO | Ravalli | 22 min |
| Jun 10, 3:39 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 51 min |
| Jun 10, 5:19 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 26 min |
| Jun 12, 8:40 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River | 48 min |
| Jun 15, 7:12 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead | 33 min |
| Jun 15, 7:53 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Granite, Ravalli, Silver Bow | 22 min |
| Jun 16, 3:20 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Sweet Grass, Wheatland | 55 min |
| Jun 16, 4:15 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater | 60 min |
| Jun 16, 5:03 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon, Stillwater, Yellowstone | 57 min |
| Jun 16, 6:20 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 55 min |
| Jun 16, 6:32 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 58 min |
| Jun 17, 5:36 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River, Rosebud | 54 min |
| Jun 17, 6:25 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River | 65 min |
| Jun 17, 7:25 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 65 min |
| Jun 18, 9:02 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Yellowstone | 45 min |
| Jun 18, 9:44 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 61 min |
| Jun 18, 10:20 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 55 min |
| Jun 18, 11:10 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Powder River, Rosebud | 65 min |
| Jun 19, 12:10 AM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 65 min |
| Jun 19, 1:12 AM MDT | Severe Thunderstorm Warning | BYZ | Carter | 29 min |
| Jun 19, 1:38 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Valley | 52 min |
| Jun 19, 1:43 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 48 min |
| Jun 19, 2:22 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Sheridan, Valley | 53 min |
| Jun 19, 2:51 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River, Rosebud | 54 min |
| Jun 19, 2:59 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Garfield, McCone | 49 min |
| Jun 19, 3:13 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 62 min |
| Jun 19, 3:15 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Richland, Roosevelt | 60 min |
| Jun 19, 3:20 PM MDT | Severe Thunderstorm Warning | GGW | Prairie | 55 min |
| Jun 19, 3:40 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River | 65 min |
| Jun 19, 3:58 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 62 min |
| Jun 19, 3:58 PM MDT | Severe Thunderstorm Warning | GGW | Dawson | 62 min |
| Jun 19, 4:12 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt | 18 min |
| Jun 19, 4:20 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 55 min |
| Jun 19, 4:25 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt | 20 min |
| Jun 19, 4:26 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland, Wibaux | 46 min |
| Jun 19, 4:30 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Yellowstone | 60 min |
| Jun 19, 4:37 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland, Wibaux | 23 min |
| Jun 19, 4:41 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 64 min |
| Jun 19, 4:47 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 58 min |
| Jun 19, 4:53 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Wibaux | 58 min |
| Jun 19, 5:05 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 55 min |
| Jun 19, 5:19 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 56 min |
| Jun 19, 5:39 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 66 min |
| Jun 19, 5:50 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Phillips, Valley | 55 min |
| Jun 19, 6:01 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 44 min |
| Jun 19, 6:33 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 57 min |
| Jun 19, 6:44 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 21 min |
| Jun 19, 6:49 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Fallon | 56 min |
| Jun 19, 7:01 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 29 min |
| Jun 19, 7:20 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 55 min |
| Jun 19, 8:13 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 24 min |
| Jun 21, 1:19 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 41 min |
| Jun 21, 2:58 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 62 min |
| Jun 21, 3:03 PM MDT | Severe Thunderstorm Warning | GGW | Prairie | 57 min |
| Jun 21, 3:18 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie | 57 min |
| Jun 21, 3:47 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Fallon | 58 min |
| Jun 21, 3:53 PM MDT | Severe Thunderstorm Warning | GGW | Wibaux | 37 min |
| Jun 21, 4:31 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 59 min |
| Jun 21, 7:36 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 54 min |
| Jun 21, 8:22 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Custer, Fallon | 53 min |
| Jun 21, 9:13 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Fallon | 62 min |
| Jun 21, 10:36 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 20 min |
| Jun 24, 4:09 AM MDT | Severe Thunderstorm Warning | BYZ | Rosebud, Treasure | 51 min |
| Jun 24, 4:57 AM MDT | Severe Thunderstorm Warning | BYZ | Powder River, Rosebud | 63 min |
| Jun 24, 5:48 AM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 23 min |
| Jun 24, 9:31 AM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 44 min |
| Jun 24, 11:18 AM MDT | Severe Thunderstorm Warning | BYZ | Carter | 38 min |
| Jun 30, 4:04 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 56 min |
| Jun 30, 4:22 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Wibaux | 53 min |
| Jun 30, 4:52 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 23 min |
| Jun 30, 4:58 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Valley | 41 min |
| Jun 30, 6:00 PM MDT | Severe Thunderstorm Warning | GGW | Wibaux | 42 min |
| Jun 30, 6:19 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Richland, Roosevelt | 56 min |
| Jun 30, 7:11 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland | 46 min |
| Jul 1, 2:18 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 42 min |
| Jul 1, 2:56 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Fergus | 49 min |
| Jul 1, 3:09 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Roosevelt, Valley | 66 min |
| Jul 1, 3:48 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum | 57 min |
| Jul 1, 4:14 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone | 37 min |
| Jul 1, 4:32 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum | 43 min |
| Jul 1, 4:40 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell, Yellowstone | 55 min |
| Jul 1, 5:10 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 65 min |
| Jul 1, 6:05 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 55 min |
| Jul 1, 6:15 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 60 min |
| Jul 1, 6:51 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 39 min |
| Jul 1, 7:20 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Fallon | 55 min |
| Jul 1, 7:27 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 63 min |
| Jul 4, 1:20 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland | 55 min |
| Jul 4, 1:56 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 34 min |
| Jul 4, 2:04 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland | 56 min |
| Jul 4, 2:35 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Wibaux | 55 min |
| Jul 4, 3:15 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt | 43 min |
| Jul 4, 3:26 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Wibaux | 34 min |
| Jul 4, 9:16 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 44 min |
| Jul 4, 9:50 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 40 min |
| Jul 4, 9:54 PM MDT | Severe Thunderstorm Warning | TFX | Hill, Liberty, Toole | 36 min |
| Jul 4, 9:54 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 36 min |
| Jul 4, 10:23 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 52 min |
| Jul 4, 10:25 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 35 min |
| Jul 4, 11:01 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Hill | 44 min |
| Jul 4, 11:02 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 58 min |
| Jul 4, 11:12 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 63 min |
| Jul 4, 11:45 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 30 min |
| Jul 4, 11:57 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 63 min |
| Jul 5, 12:07 AM MDT | Severe Thunderstorm Warning | GGW | Garfield, Phillips, Valley | 53 min |
| Jul 5, 12:15 AM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Fergus | 30 min |
| Jul 5, 12:22 AM MDT | Severe Thunderstorm Warning | TFX | Blaine | 23 min |
| Jul 5, 12:29 AM MDT | Severe Thunderstorm Warning | GGW | Petroleum, Phillips | 61 min |
| Jul 5, 12:45 AM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Fergus | 30 min |
| Jul 5, 12:51 AM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Valley | 54 min |
| Jul 5, 1:26 AM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum, Phillips, Valley | 64 min |
| Jul 5, 2:28 AM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Prairie, Valley | 62 min |
| Jul 14, 4:56 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 64 min |
| Jul 14, 5:58 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 62 min |
| Jul 23, 3:59 PM MDT | Severe Thunderstorm Warning | MSO | Silver Bow | 17 min |
| Jul 27, 2:38 AM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 23 min |
| Jul 27, 3:24 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 66 min |
| Jul 27, 4:26 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Fallon | 64 min |
| Jul 27, 4:44 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 61 min |
| Jul 27, 5:04 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 41 min |
| Jul 27, 5:17 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 58 min |
| Jul 27, 5:26 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 33 min |
| Jul 27, 5:34 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 56 min |
| Jul 27, 6:09 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 66 min |
| Jul 27, 6:24 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 66 min |
| Jul 27, 6:47 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland, Wibaux | 58 min |
| Jul 27, 7:07 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Valley | 53 min |
| Jul 27, 7:11 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 33 min |
| Jul 27, 7:17 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone | 58 min |
| Jul 27, 7:28 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Valley | 62 min |
| Jul 27, 7:40 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Dawson, McCone, Richland, Roosevelt, Sheridan | 65 min |
| Jul 27, 7:44 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, McCone, Roosevelt, Valley | 61 min |
| Jul 27, 7:48 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 57 min |
| Jul 27, 7:59 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone | 61 min |
| Jul 27, 8:16 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 59 min |
| Jul 27, 8:22 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Fallon | 53 min |
| Jul 27, 8:39 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Wibaux | 66 min |
| Jul 27, 8:43 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Sheridan, Valley | 62 min |
| Jul 27, 9:15 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie, Richland, Wibaux | 60 min |
| Aug 5, 4:54 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater, Sweet Grass | 36 min |
| Aug 5, 6:08 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 67 min |
| Aug 5, 6:58 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Yellowstone | 62 min |
| Aug 10, 5:00 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Ravalli | 60 min |
| Aug 10, 5:22 PM MDT | Severe Thunderstorm Warning | MSO | Mineral, Missoula, Ravalli | 53 min |
| Aug 10, 6:04 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula, Ravalli | 26 min |
| Aug 10, 6:23 PM MDT | Severe Thunderstorm Warning | MSO | Missoula | 52 min |
| Aug 10, 6:40 PM MDT | Severe Thunderstorm Warning | MSO | Mineral, Missoula, Sanders | 50 min |
| Aug 10, 6:44 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula, Powell | 61 min |
| Aug 10, 7:18 PM MDT | Severe Thunderstorm Warning | MSO | Lake, Missoula | 42 min |
| Aug 11, 7:20 PM MDT | Severe Thunderstorm Warning | MSO | Mineral, Sanders | 40 min |
| Aug 12, 5:43 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 32 min |
| Aug 12, 5:51 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 54 min |
| Aug 14, 3:38 PM MDT | Severe Thunderstorm Warning | MSO | Missoula, Ravalli | 37 min |
| Aug 14, 3:47 PM MDT | Severe Thunderstorm Warning | MSO | Mineral, Missoula, Sanders | 28 min |
| Aug 17, 2:50 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 55 min |
| Aug 30, 7:23 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Valley | 37 min |
| Aug 30, 7:55 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Roosevelt, Valley | 50 min |
| Sep 5, 7:14 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 46 min |
| Sep 5, 7:20 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River, Rosebud | 55 min |
| Sep 5, 7:41 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 49 min |
| Sep 5, 8:19 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 56 min |
| Sep 5, 8:25 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 32 min |
| Sep 5, 8:51 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Fallon | 54 min |
| Sep 5, 9:12 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 51 min |
| Sep 5, 9:25 PM MDT | Severe Thunderstorm Warning | GGW | Wibaux | 9 min |
| Sep 5, 10:24 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Wibaux | 36 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Powder River County28
- Dawson County22
- Carter County21
- Valley County21
- McCone County20
- Big Horn County18
- Custer County18
- Rosebud County18
- Richland County15
- Wibaux County14
- Roosevelt County13
- Fallon County13
- Garfield County11
- Prairie County11
- Phillips County11
- Missoula County9
- Yellowstone County9
- Blaine County9
- Chouteau County8
- Daniels County8
- Mineral County7
- Ravalli County6
- Sanders County5
- Sheridan County5
- Hill County5
- Fergus County4
- Stillwater County4
- Granite County4
- Petroleum County4
- Wheatland County3
- Sweet Grass County3
- Treasure County2
- Meagher County2
- Carbon County2
- Silver Bow County2
- Broadwater County1
- Gallatin County1
- Jefferson County1
- Cascade County1
- Beaverhead County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20142016
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.