Alert archive / Montana / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in Montana, 2014
260 severe thunderstorm warnings in 2014. 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 2014. Tap one for its archive.
- Severe Thunderstorm Warnings
- 260
- Busiest month
- June84 severe thunderstorm warnings
- Busiest day
- July 24, 201433 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.
132 of 260 severe thunderstorm warnings covering Montana in 2014 had a qualifying storm report inside them; 250 of 340 hail, wind and damage reports fell inside a warning, on average 25 minutes after it went out.
Montana, 2014
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Severe thunderstorm warnings | 260 | 132 | 49% | 340 | 74% | 25 min |
Each office's whole area, 2014
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Great Falls, MT: severe thunderstorm warnings | 42 | 23 | 45% | 67 | 63% | 22 min |
| NWS Missoula, MT: severe thunderstorm warnings | 10 | 4 | 60% | 18 | 22% | 13 min |
| NWS Billings, MT: severe thunderstorm warnings | 120 | 56 | 53% | 151 | 77% | 25 min |
| NWS Glasgow, MT: severe thunderstorm warnings | 98 | 51 | 48% | 119 | 77% | 25 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 18, 6:26 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Roosevelt, Valley | 64 min |
| May 4, 3:07 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 38 min |
| May 4, 3:44 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau | 46 min |
| May 5, 4:53 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Yellowstone | 67 min |
| May 5, 5:51 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 54 min |
| May 15, 7:11 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Teton | 49 min |
| May 15, 7:54 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Meagher | 51 min |
| May 18, 2:06 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 54 min |
| May 18, 3:08 PM MDT | Severe Thunderstorm Warning | BYZ | Sweet Grass | 37 min |
| May 18, 3:33 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Stillwater, Sweet Grass | 57 min |
| May 18, 4:24 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon, Stillwater, Yellowstone | 51 min |
| May 18, 4:47 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 58 min |
| May 18, 5:20 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 55 min |
| May 18, 5:25 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Treasure, Yellowstone | 65 min |
| May 18, 5:42 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 33 min |
| May 18, 6:14 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 61 min |
| May 18, 6:20 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud, Treasure, Yellowstone | 55 min |
| May 18, 7:00 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Custer, Powder River, Rosebud, Treasure | 60 min |
| May 18, 7:52 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Custer, Powder River, Rosebud | 53 min |
| May 18, 8:40 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Custer, Fallon, Powder River | 65 min |
| May 22, 9:28 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 62 min |
| May 23, 5:11 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River, Rosebud | 64 min |
| May 23, 6:03 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River, Rosebud | 57 min |
| May 24, 2:45 PM MDT | Severe Thunderstorm Warning | GGW | McCone | 60 min |
| May 24, 3:07 PM MDT | Severe Thunderstorm Warning | GGW | McCone | 53 min |
| May 24, 4:44 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt | 61 min |
| May 24, 5:39 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 51 min |
| May 26, 1:49 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 56 min |
| May 26, 2:44 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 61 min |
| May 26, 3:08 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 52 min |
| May 26, 3:25 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 65 min |
| May 26, 3:46 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt | 59 min |
| May 26, 7:16 PM MDT | Severe Thunderstorm Warning | GGW | Prairie | 59 min |
| May 26, 7:57 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater, Yellowstone | 63 min |
| May 26, 8:45 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Yellowstone | 60 min |
| May 27, 10:21 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Musselshell | 54 min |
| May 27, 11:13 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 62 min |
| May 28, 12:14 AM MDT | Severe Thunderstorm Warning | BYZ | Musselshell, Rosebud, Treasure, Yellowstone | 61 min |
| May 28, 2:24 AM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 66 min |
| May 28, 4:31 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Treasure, Yellowstone | 59 min |
| May 28, 4:36 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Teton | 39 min |
| May 28, 4:47 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 43 min |
| May 28, 5:24 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Liberty | 51 min |
| May 28, 5:38 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 67 min |
| May 28, 5:39 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau | 51 min |
| May 28, 5:49 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Judith Basin | 56 min |
| May 28, 6:15 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Fergus, Hill | 60 min |
| May 28, 6:48 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Fergus, Judith Basin | 57 min |
| May 28, 7:13 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Hill | 62 min |
| May 28, 7:47 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 58 min |
| May 28, 8:07 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 38 min |
| May 28, 8:34 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 56 min |
| May 28, 8:56 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland | 64 min |
| May 28, 9:25 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 65 min |
| May 31, 2:45 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 60 min |
| May 31, 3:41 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 64 min |
| May 31, 3:48 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 27 min |
| May 31, 3:56 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone | 64 min |
| May 31, 4:07 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 53 min |
| May 31, 4:37 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 53 min |
| May 31, 5:05 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, McCone, Roosevelt, Sheridan | 55 min |
| May 31, 5:12 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River, Rosebud | 63 min |
| May 31, 5:12 PM MDT | Severe Thunderstorm Warning | GGW | McCone | 63 min |
| May 31, 5:16 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 59 min |
| May 31, 5:29 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone | 61 min |
| May 31, 5:38 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 37 min |
| May 31, 6:09 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River, Rosebud | 66 min |
| May 31, 6:22 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone | 53 min |
| May 31, 7:29 PM MDT | Severe Thunderstorm Warning | GGW | McCone | 61 min |
| Jun 3, 12:59 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Fallon | 37 min |
| Jun 3, 1:33 PM MDT | Severe Thunderstorm Warning | TFX | Fergus, Judith Basin | 42 min |
| Jun 3, 2:07 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 38 min |
| Jun 3, 2:29 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 46 min |
| Jun 3, 2:59 PM MDT | Severe Thunderstorm Warning | BYZ | Wheatland | 61 min |
| Jun 3, 3:05 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 40 min |
| Jun 3, 3:07 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 23 min |
| Jun 3, 3:43 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 47 min |
| Jun 3, 3:58 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 52 min |
| Jun 3, 4:02 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Wheatland | 32 min |
| Jun 3, 7:40 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud, Treasure | 50 min |
| Jun 3, 7:42 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 36 min |
| Jun 3, 8:10 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 25 min |
| Jun 3, 8:29 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 61 min |
| Jun 3, 9:23 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 37 min |
| Jun 4, 1:34 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 56 min |
| Jun 4, 2:22 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Powder River, Rosebud | 53 min |
| Jun 4, 2:27 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 63 min |
| Jun 4, 2:55 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 35 min |
| Jun 4, 2:56 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 23 min |
| Jun 4, 3:10 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 50 min |
| Jun 4, 3:29 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 31 min |
| Jun 4, 3:59 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 46 min |
| Jun 10, 2:59 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Musselshell, Stillwater, Yellowstone | 30 min |
| Jun 10, 3:45 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Yellowstone | 32 min |
| Jun 10, 5:52 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 53 min |
| Jun 12, 11:05 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Teton | 40 min |
| Jun 13, 1:49 AM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark | 41 min |
| Jun 13, 2:40 AM MDT | Severe Thunderstorm Warning | TFX | Cascade, Judith Basin | 50 min |
| Jun 13, 2:42 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 33 min |
| Jun 13, 3:15 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 30 min |
| Jun 13, 5:58 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Valley | 46 min |
| Jun 13, 8:04 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Sheridan | 29 min |
| Jun 16, 4:06 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 24 min |
| Jun 16, 4:29 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 61 min |
| Jun 16, 4:43 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 62 min |
| Jun 16, 6:05 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone | 55 min |
| Jun 16, 6:57 PM MDT | Severe Thunderstorm Warning | GGW | Dawson | 63 min |
| Jun 16, 7:57 PM MDT | Severe Thunderstorm Warning | GGW | Dawson | 63 min |
| Jun 17, 4:18 AM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 42 min |
| Jun 17, 4:55 AM MDT | Severe Thunderstorm Warning | GGW | Garfield, Prairie | 65 min |
| Jun 17, 6:21 AM MDT | Severe Thunderstorm Warning | GGW | McCone, Prairie | 54 min |
| Jun 17, 7:43 AM MDT | Severe Thunderstorm Warning | GGW | McCone | 62 min |
| Jun 17, 1:02 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Fallon | 43 min |
| Jun 17, 1:07 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Wibaux | 53 min |
| Jun 17, 1:26 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 64 min |
| Jun 17, 1:41 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Fallon | 64 min |
| Jun 17, 1:51 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Wibaux | 54 min |
| Jun 17, 2:17 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie | 58 min |
| Jun 17, 2:21 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone | 54 min |
| Jun 17, 2:23 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Fallon | 52 min |
| Jun 17, 2:35 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Fallon | 55 min |
| Jun 17, 3:45 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 45 min |
| Jun 17, 3:53 PM MDT | Severe Thunderstorm Warning | GGW | Dawson | 67 min |
| Jun 17, 4:00 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 30 min |
| Jun 17, 4:01 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 44 min |
| Jun 17, 4:01 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Valley | 59 min |
| Jun 17, 4:12 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Wibaux | 63 min |
| Jun 17, 4:31 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 29 min |
| Jun 17, 4:42 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 33 min |
| Jun 17, 5:13 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Valley | 62 min |
| Jun 17, 5:56 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Valley | 64 min |
| Jun 17, 8:20 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River, Rosebud | 55 min |
| Jun 17, 9:11 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 34 min |
| Jun 17, 9:12 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River | 63 min |
| Jun 17, 9:32 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie | 58 min |
| Jun 17, 10:20 PM MDT | Severe Thunderstorm Warning | GGW | McCone | 55 min |
| Jun 25, 3:41 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 64 min |
| Jun 25, 3:44 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 61 min |
| Jun 25, 4:44 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 31 min |
| Jun 25, 9:05 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 40 min |
| Jun 25, 9:44 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 46 min |
| Jun 25, 10:28 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 47 min |
| Jun 26, 3:28 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River, Rosebud | 50 min |
| Jun 26, 4:32 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie | 25 min |
| Jun 26, 5:14 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Stillwater, Wheatland | 61 min |
| Jun 26, 6:32 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Fallon | 58 min |
| Jun 26, 7:31 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Powder River | 44 min |
| Jun 26, 9:46 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 44 min |
| Jun 26, 10:10 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 22 min |
| Jun 27, 5:26 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 64 min |
| Jul 3, 7:16 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 44 min |
| Jul 3, 8:00 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 60 min |
| Jul 6, 5:18 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 57 min |
| Jul 10, 8:25 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 35 min |
| Jul 10, 8:57 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 19 min |
| Jul 10, 10:40 PM MDT | Severe Thunderstorm Warning | TFX | Glacier | 50 min |
| Jul 11, 1:12 AM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 48 min |
| Jul 11, 1:55 AM MDT | Severe Thunderstorm Warning | TFX | Blaine | 25 min |
| Jul 11, 2:42 AM MDT | Severe Thunderstorm Warning | GGW | McCone, Roosevelt, Valley | 63 min |
| Jul 11, 5:28 AM MDT | Severe Thunderstorm Warning | GGW | Phillips | 34 min |
| Jul 20, 10:52 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 8 min |
| Jul 22, 1:27 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 28 min |
| Jul 22, 2:19 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 26 min |
| Jul 22, 2:46 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 44 min |
| Jul 22, 3:10 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 65 min |
| Jul 22, 3:40 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 65 min |
| Jul 22, 3:56 PM MDT | Severe Thunderstorm Warning | GGW | Prairie | 29 min |
| Jul 22, 3:58 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 62 min |
| Jul 22, 4:02 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 43 min |
| Jul 22, 4:03 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 57 min |
| Jul 22, 4:04 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 56 min |
| Jul 22, 4:26 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 49 min |
| Jul 22, 4:35 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Meagher | 40 min |
| Jul 22, 4:36 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Fallon | 43 min |
| Jul 22, 4:44 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 61 min |
| Jul 22, 4:59 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Fallon | 61 min |
| Jul 22, 5:20 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater, Sweet Grass | 55 min |
| Jul 22, 5:29 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Fallon | 31 min |
| Jul 22, 5:44 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 31 min |
| Jul 22, 5:54 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon, Stillwater | 66 min |
| Jul 22, 6:26 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Carbon, Yellowstone | 64 min |
| Jul 22, 7:25 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Yellowstone | 65 min |
| Jul 22, 8:21 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 54 min |
| Jul 22, 8:40 PM MDT | Severe Thunderstorm Warning | TFX | Pondera, Teton | 50 min |
| Jul 23, 6:09 PM MDT | Severe Thunderstorm Warning | MSO | Lincoln, Sanders | 36 min |
| Jul 23, 6:43 PM MDT | Severe Thunderstorm Warning | MSO | Lincoln | 47 min |
| Jul 23, 7:43 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Powell | 29 min |
| Jul 23, 7:57 PM MDT | Severe Thunderstorm Warning | MSO | Silver Bow | 36 min |
| Jul 23, 8:09 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 66 min |
| Jul 23, 8:11 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Powell | 23 min |
| Jul 23, 9:30 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 15 min |
| Jul 23, 10:27 PM MDT | Severe Thunderstorm Warning | TFX | Fergus, Judith Basin | 48 min |
| Jul 23, 10:40 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 50 min |
| Jul 23, 10:49 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 46 min |
| Jul 23, 11:06 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 14 min |
| Jul 23, 11:28 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 47 min |
| Jul 24, 12:11 AM MDT | Severe Thunderstorm Warning | GGW | Phillips | 64 min |
| Jul 24, 12:14 AM MDT | Severe Thunderstorm Warning | TFX | Blaine | 46 min |
| Jul 24, 1:25 AM MDT | Severe Thunderstorm Warning | GGW | Garfield | 65 min |
| Jul 24, 1:35 AM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 55 min |
| Jul 24, 2:09 AM MDT | Severe Thunderstorm Warning | GGW | Garfield | 44 min |
| Jul 24, 2:13 AM MDT | Severe Thunderstorm Warning | GGW | Daniels, Valley | 62 min |
| Jul 24, 2:23 AM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone | 67 min |
| Jul 24, 2:36 AM MDT | Severe Thunderstorm Warning | GGW | Dawson, Garfield, McCone, Prairie | 54 min |
| Jul 24, 2:42 AM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Valley | 63 min |
| Jul 24, 3:14 AM MDT | Severe Thunderstorm Warning | GGW | Daniels, Dawson, McCone, Richland, Roosevelt, Sheridan | 61 min |
| Jul 24, 4:08 AM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt, Sheridan | 22 min |
| Jul 24, 3:47 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 58 min |
| Jul 24, 4:17 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 28 min |
| Jul 24, 4:32 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone | 58 min |
| Jul 24, 4:35 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 40 min |
| Jul 24, 4:37 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Phillips, Valley | 38 min |
| Jul 24, 5:07 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Valley | 53 min |
| Jul 24, 5:20 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Valley | 55 min |
| Jul 24, 5:26 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland | 64 min |
| Jul 24, 5:35 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Garfield, McCone, Richland, Roosevelt, Valley | 55 min |
| Jul 24, 5:39 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Sheridan | 66 min |
| Jul 24, 6:00 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 60 min |
| Jul 24, 6:07 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Sheridan | 38 min |
| Jul 24, 6:17 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland, Wibaux | 31 min |
| Jul 24, 6:31 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Richland, Roosevelt, Sheridan | 59 min |
| Jul 24, 6:53 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Wibaux | 54 min |
| Jul 24, 7:18 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt | 27 min |
| Jul 24, 7:38 PM MDT | Severe Thunderstorm Warning | GGW | Richland, Roosevelt | 16 min |
| Aug 3, 5:54 PM MDT | Severe Thunderstorm Warning | GGW | McCone | 66 min |
| Aug 3, 6:20 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 40 min |
| Aug 3, 6:54 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 66 min |
| Aug 3, 6:59 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum, Phillips | 61 min |
| Aug 3, 7:50 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie | 55 min |
| Aug 3, 7:54 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Phillips | 66 min |
| Aug 3, 8:37 PM MDT | Severe Thunderstorm Warning | GGW | Prairie | 37 min |
| Aug 3, 8:45 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum, Phillips | 45 min |
| Aug 3, 8:49 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 56 min |
| Aug 4, 7:38 PM MDT | Severe Thunderstorm Warning | TFX | Glacier | 37 min |
| Aug 9, 2:46 PM MDT | Severe Thunderstorm Warning | GGW | Prairie | 34 min |
| Aug 15, 12:05 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Powell | 25 min |
| Aug 15, 12:08 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Powell, Silver Bow | 22 min |
| Aug 15, 12:34 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 28 min |
| Aug 15, 12:57 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 48 min |
| Aug 15, 1:36 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Jefferson, Lewis and Clark | 39 min |
| Aug 15, 2:06 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Meagher | 39 min |
| Aug 15, 2:49 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 38 min |
| Aug 15, 3:29 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Judith Basin | 46 min |
| Aug 15, 4:04 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Fergus, Judith Basin | 41 min |
| Aug 15, 6:26 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 24 min |
| Aug 15, 7:34 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 41 min |
| Aug 15, 7:44 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum, Phillips | 47 min |
| Aug 15, 7:52 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Powell, Silver Bow | 53 min |
| Aug 15, 9:55 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Prairie | 35 min |
| Aug 21, 7:39 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 36 min |
| Aug 22, 6:42 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 33 min |
| Aug 28, 7:40 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 50 min |
| Aug 28, 8:28 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 47 min |
| Aug 28, 8:59 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 35 min |
| Aug 28, 10:13 PM MDT | Severe Thunderstorm Warning | GGW | Phillips, Valley | 47 min |
| Aug 30, 6:07 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Fallon | 41 min |
| Sep 3, 5:40 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Sheridan | 65 min |
| Sep 3, 6:29 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Sheridan | 61 min |
| Sep 18, 4:02 PM MDT | Severe Thunderstorm Warning | BYZ | Park | 43 min |
| Sep 18, 4:28 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon, Stillwater, Sweet Grass | 46 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- McCone County32
- Carter County31
- Rosebud County26
- Powder River County26
- Valley County24
- Dawson County23
- Big Horn County22
- Garfield County21
- Custer County21
- Prairie County19
- Roosevelt County18
- Phillips County18
- Fallon County17
- Cascade County15
- Yellowstone County15
- Chouteau County13
- Sheridan County13
- Daniels County12
- Fergus County10
- Richland County10
- Blaine County10
- Stillwater County8
- Judith Basin County7
- Treasure County6
- Musselshell County5
- Golden Valley County5
- Petroleum County5
- Wibaux County5
- Powell County5
- Teton County4
- Sweet Grass County4
- Carbon County4
- Lewis and Clark County4
- Meagher County3
- Hill County3
- Wheatland County3
- Silver Bow County3
- Deer Lodge County3
- Glacier County2
- Lincoln County2
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20132015
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.