Alert archive / Montana / Severe Thunderstorm Warnings

Severe Thunderstorm Warnings in Montana, 2024

343 severe thunderstorm warnings in 2024. 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 2024. Tap one for its archive.

Severe Thunderstorm Warnings: 343
Busiest month: August149 severe thunderstorm warnings
Busiest day: June 21, 202426 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.

146 of 343 severe thunderstorm warnings covering Montana in 2024 had a qualifying storm report inside them; 304 of 512 hail, wind and damage reports fell inside a warning, on average 24 minutes after it went out.

Montana, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Severe thunderstorm warnings	343	146	57%	512	59%	24 min

Each office's whole area, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Great Falls, MT: severe thunderstorm warnings	139	54	61%	152	57%	19 min
NWS Billings, MT: severe thunderstorm warnings	89	31	65%	127	50%	23 min
NWS Missoula, MT: severe thunderstorm warnings	32	19	41%	108	44%	15 min
NWS Glasgow, MT: severe thunderstorm warnings	92	47	49%	157	73%	31 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 5, 4:20 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Beaverhead, Madison	40 min
Apr 5, 4:20 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Beaverhead, Madison	40 min
Apr 22, 12:59 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, McCone, Richland, Roosevelt	61 min
Apr 22, 1:30 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Garfield, McCone, Richland, Roosevelt, Valley	60 min
Apr 22, 2:51 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, McCone, Roosevelt, Valley	54 min
Apr 22, 3:02 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, McCone, Valley	58 min
Apr 22, 3:42 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, McCone, Richland, Roosevelt, Valley	63 min
Apr 22, 4:46 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Garfield, McCone, Prairie, Valley	59 min
Apr 30, 3:45 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Chouteau, Hill, Liberty	45 min
May 5, 8:43 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Garfield, McCone, Prairie, Richland	62 min
May 6, 12:07 PM MDT	Severe Thunderstorm Warning	BYZ	Carter	23 min
May 13, 2:19 PM MDT	Severe Thunderstorm Warning	TFX	Hill	26 min
May 13, 7:24 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, McCone, Roosevelt, Valley	44 min
May 16, 5:50 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Valley	55 min
May 17, 2:07 PM MDT	Severe Thunderstorm Warning	GGW	Richland, Roosevelt	26 min
May 17, 4:10 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Garfield, McCone, Prairie	65 min
May 25, 3:11 PM MDT	Severe Thunderstorm Warning	GGW	Phillips	64 min
May 28, 6:31 PM MDT	Severe Thunderstorm Warning	TFX	Broadwater, Jefferson, Lewis and Clark, Meagher	31 min
May 28, 7:00 PM MDT	Severe Thunderstorm Warning	TFX	Liberty, Pondera, Toole	45 min
May 29, 2:19 PM MDT	Severe Thunderstorm Warning	BYZ	Carter, Powder River	56 min
May 29, 2:58 PM MDT	Severe Thunderstorm Warning	BYZ	Carter	47 min
May 29, 3:40 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Carter	35 min
May 29, 4:18 PM MDT	Severe Thunderstorm Warning	BYZ	Carter, Fallon	4 min
May 29, 4:21 PM MDT	Severe Thunderstorm Warning	BYZ	Carter, Fallon	24 min
Jun 3, 6:53 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, McCone, Prairie, Valley	52 min
Jun 3, 9:53 PM MDT	Severe Thunderstorm Warning	BYZ	Fallon	37 min
Jun 10, 12:31 PM MDT	Severe Thunderstorm Warning	BYZ	Carter	44 min
Jun 10, 12:57 PM MDT	Severe Thunderstorm Warning	BYZ	Carter	18 min
Jun 14, 6:37 PM MDT	Severe Thunderstorm Warning	BYZ	Powder River	38 min
Jun 15, 12:21 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau	24 min
Jun 15, 12:44 PM MDT	Severe Thunderstorm Warning	TFX	Cascade	46 min
Jun 15, 1:04 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau, Judith Basin	41 min
Jun 15, 3:25 PM MDT	Severe Thunderstorm Warning	GGW	Petroleum, Phillips	65 min
Jun 15, 4:16 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Park, Sweet Grass	29 min
Jun 15, 5:12 PM MDT	Severe Thunderstorm Warning	BYZ	Musselshell, Rosebud	48 min
Jun 15, 5:30 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, McCone, Valley	60 min
Jun 15, 6:28 PM MDT	Severe Thunderstorm Warning Destructive damage threat	GGW	Daniels, Garfield, McCone, Richland, Roosevelt, Valley	62 min
Jun 15, 6:36 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, McCone	54 min
Jun 15, 7:27 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Daniels, Dawson, McCone, Richland, Roosevelt, Sheridan and 1 more	63 min
Jun 15, 8:02 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Richland, Wibaux	58 min
Jun 15, 8:26 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Daniels, Dawson, Richland, Roosevelt, Sheridan	49 min
Jun 17, 4:09 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn, Powder River	51 min
Jun 17, 4:36 PM MDT	Severe Thunderstorm Warning	BYZ	Custer, Powder River	39 min
Jun 20, 1:56 PM MDT	Severe Thunderstorm Warning	TFX	Judith Basin	34 min
Jun 20, 2:26 PM MDT	Severe Thunderstorm Warning	TFX	Fergus, Judith Basin	49 min
Jun 20, 3:14 PM MDT	Severe Thunderstorm Warning	TFX	Fergus, Judith Basin	46 min
Jun 20, 4:31 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	74 min
Jun 20, 4:59 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	46 min
Jun 20, 5:41 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Blaine	79 min
Jun 20, 7:12 PM MDT	Severe Thunderstorm Warning	GGW	Garfield	63 min
Jun 20, 7:24 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	51 min
Jun 20, 7:43 PM MDT	Severe Thunderstorm Warning	GGW	Phillips	46 min
Jun 20, 8:14 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	46 min
Jun 20, 8:58 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	25 min
Jun 21, 12:01 PM MDT	Severe Thunderstorm Warning	TFX	Judith Basin	44 min
Jun 21, 12:40 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Judith Basin	50 min
Jun 21, 1:22 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Fergus, Judith Basin	38 min
Jun 21, 1:53 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Fergus, Judith Basin	52 min
Jun 21, 1:53 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Judith Basin, Meagher	52 min
Jun 21, 2:28 PM MDT	Severe Thunderstorm Warning	TFX	Judith Basin	62 min
Jun 21, 2:35 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	55 min
Jun 21, 2:39 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	66 min
Jun 21, 2:59 PM MDT	Severe Thunderstorm Warning	TFX	Pondera, Teton	46 min
Jun 21, 3:03 PM MDT	Severe Thunderstorm Warning	TFX	Broadwater	19 min
Jun 21, 3:03 PM MDT	Severe Thunderstorm Warning	TFX	Teton	57 min
Jun 21, 3:45 PM MDT	Severe Thunderstorm Warning	TFX	Pondera, Teton	45 min
Jun 21, 3:51 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau	54 min
Jun 21, 4:03 PM MDT	Severe Thunderstorm Warning	TFX	Teton	42 min
Jun 21, 4:10 PM MDT	Severe Thunderstorm Warning	TFX	Blaine, Hill	50 min
Jun 21, 4:15 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Chouteau, Pondera, Teton	60 min
Jun 21, 4:35 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Blaine, Chouteau, Hill	25 min
Jun 21, 4:45 PM MDT	Severe Thunderstorm Warning	TFX	Teton	45 min
Jun 21, 5:07 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Chouteau	53 min
Jun 21, 5:36 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Teton	54 min
Jun 21, 5:52 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau	38 min
Jun 21, 6:22 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau, Judith Basin	53 min
Jun 21, 6:29 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	46 min
Jun 21, 10:52 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	38 min
Jun 21, 11:39 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Rosebud	51 min
Jun 21, 11:52 PM MDT	Severe Thunderstorm Warning	GGW	Garfield	23 min
Jun 22, 1:17 AM MDT	Severe Thunderstorm Warning	BYZ	Custer	43 min
Jun 22, 3:43 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Prairie, Wibaux	62 min
Jun 23, 6:54 PM MDT	Severe Thunderstorm Warning	GGW	Valley	44 min
Jun 23, 11:57 PM MDT	Severe Thunderstorm Warning	GGW	McCone, Richland, Roosevelt, Valley	33 min
Jun 24, 12:26 AM MDT	Severe Thunderstorm Warning	GGW	McCone, Richland, Roosevelt	49 min
Jun 26, 9:06 PM MDT	Severe Thunderstorm Warning	MSO	Ravalli	24 min
Jun 27, 1:41 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Musselshell, Rosebud, Treasure, Yellowstone	64 min
Jun 27, 1:47 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn	58 min
Jun 27, 2:07 PM MDT	Severe Thunderstorm Warning	BYZ	Treasure, Yellowstone	53 min
Jun 27, 2:36 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn, Rosebud	54 min
Jun 27, 2:41 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	64 min
Jun 27, 3:09 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Custer, Rosebud	66 min
Jun 27, 3:22 PM MDT	Severe Thunderstorm Warning	BYZ	Custer, Powder River, Rosebud	53 min
Jun 27, 3:40 PM MDT	Severe Thunderstorm Warning	BYZ	Custer	39 min
Jun 27, 3:55 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Dawson, Prairie	65 min
Jun 27, 4:06 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Custer, Powder River	39 min
Jun 27, 4:39 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Prairie	66 min
Jun 27, 4:50 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Dawson, Richland, Wibaux	55 min
Jun 27, 5:47 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Dawson, Richland, Roosevelt, Wibaux	42 min
Jun 30, 3:00 PM MDT	Severe Thunderstorm Warning	TFX	Beaverhead, Gallatin, Madison	45 min
Jun 30, 3:28 PM MDT	Severe Thunderstorm Warning	TFX	Gallatin, Madison	62 min
Jun 30, 3:43 PM MDT	Severe Thunderstorm Warning	TFX	Gallatin, Madison	47 min
Jun 30, 3:47 PM MDT	Severe Thunderstorm Warning	TFX	Gallatin	43 min
Jun 30, 4:39 PM MDT	Severe Thunderstorm Warning	BYZ	Park, Sweet Grass	36 min
Jun 30, 5:16 PM MDT	Severe Thunderstorm Warning	BYZ	Golden Valley, Sweet Grass, Wheatland	29 min
Jun 30, 8:21 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud, Treasure	24 min
Jun 30, 8:45 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	30 min
Jun 30, 8:57 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	13 min
Jun 30, 9:19 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	10 min
Jul 2, 5:11 PM MDT	Severe Thunderstorm Warning	TFX	Hill, Liberty	34 min
Jul 2, 6:15 PM MDT	Severe Thunderstorm Warning	TFX	Hill	30 min
Jul 5, 3:09 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, McCone, Roosevelt, Valley	66 min
Jul 12, 6:38 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Valley	67 min
Jul 12, 8:13 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Roosevelt, Sheridan	46 min
Jul 12, 8:16 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Roosevelt, Valley	59 min
Jul 13, 2:18 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	27 min
Jul 13, 2:40 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	35 min
Jul 13, 3:09 PM MDT	Severe Thunderstorm Warning	GGW	Phillips	66 min
Jul 13, 3:09 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	21 min
Jul 13, 3:18 PM MDT	Severe Thunderstorm Warning	TFX	Hill	27 min
Jul 13, 3:29 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Blaine	31 min
Jul 13, 3:47 PM MDT	Severe Thunderstorm Warning	TFX	Hill	28 min
Jul 13, 3:57 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Blaine	33 min
Jul 13, 4:13 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Garfield, Petroleum, Phillips, Valley	62 min
Jul 13, 4:13 PM MDT	Severe Thunderstorm Warning	TFX	Blaine, Hill	32 min
Jul 13, 4:42 PM MDT	Severe Thunderstorm Warning Destructive damage threat	TFX	Blaine, Hill	33 min
Jul 13, 4:45 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, Petroleum, Phillips	60 min
Jul 13, 4:50 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, McCone, Roosevelt, Valley	55 min
Jul 13, 4:59 PM MDT	Severe Thunderstorm Warning	TFX	Blaine, Hill	31 min
Jul 13, 5:14 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, Petroleum, Phillips, Valley	31 min
Jul 13, 5:14 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Blaine	31 min
Jul 13, 5:41 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Dawson, McCone	64 min
Jul 13, 5:44 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Garfield, Petroleum	61 min
Jul 13, 5:44 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Blaine	31 min
Jul 13, 5:56 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	64 min
Jul 13, 6:30 PM MDT	Severe Thunderstorm Warning	BYZ	Custer	30 min
Jul 13, 6:34 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, McCone, Prairie	26 min
Jul 13, 6:55 PM MDT	Severe Thunderstorm Warning	BYZ	Custer, Rosebud	65 min
Jul 13, 7:49 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Carter, Custer, Powder River	56 min
Jul 13, 8:34 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Carter, Fallon	26 min
Jul 13, 8:44 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Carter	61 min
Jul 17, 3:55 PM MDT	Severe Thunderstorm Warning	TFX	Judith Basin	65 min
Jul 17, 5:54 PM MDT	Severe Thunderstorm Warning	BYZ	Wheatland	36 min
Jul 17, 6:17 PM MDT	Severe Thunderstorm Warning	BYZ	Wheatland	43 min
Jul 17, 6:55 PM MDT	Severe Thunderstorm Warning	BYZ	Sweet Grass, Wheatland	50 min
Jul 24, 8:42 PM MDT	Severe Thunderstorm Warning	MSO	Missoula, Ravalli	48 min
Jul 24, 8:49 PM MDT	Severe Thunderstorm Warning	MSO	Ravalli	26 min
Jul 24, 8:57 PM MDT	Severe Thunderstorm Warning	MSO	Ravalli	10 min
Jul 24, 9:02 PM MDT	Severe Thunderstorm Warning Considerable damage threat	MSO	Lake, Missoula, Sanders	28 min
Jul 24, 9:10 PM MDT	Severe Thunderstorm Warning Considerable damage threat	MSO	Granite, Missoula, Ravalli	16 min
Jul 24, 9:28 PM MDT	Severe Thunderstorm Warning	MSO	Missoula, Powell	32 min
Jul 24, 9:31 PM MDT	Severe Thunderstorm Warning Considerable damage threat	MSO	Lake, Sanders	29 min
Jul 24, 9:57 PM MDT	Severe Thunderstorm Warning	MSO	Lake, Missoula	33 min
Jul 25, 4:52 PM MDT	Severe Thunderstorm Warning	TFX	Gallatin	53 min
Jul 25, 5:07 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Fergus	53 min
Jul 25, 5:10 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, Petroleum, Phillips	65 min
Jul 25, 6:03 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Phillips, Valley	57 min
Jul 25, 6:24 PM MDT	Severe Thunderstorm Warning	BYZ	Stillwater, Sweet Grass	36 min
Jul 25, 6:52 PM MDT	Severe Thunderstorm Warning	BYZ	Stillwater, Yellowstone	23 min
Jul 25, 6:55 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Garfield, Phillips, Valley	65 min
Jul 25, 7:11 PM MDT	Severe Thunderstorm Warning	BYZ	Yellowstone	49 min
Aug 4, 7:41 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn, Yellowstone	34 min
Aug 4, 8:12 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn, Yellowstone	33 min
Aug 4, 8:41 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn, Treasure, Yellowstone	49 min
Aug 4, 9:27 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn, Rosebud, Treasure	63 min
Aug 6, 4:32 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Stillwater, Yellowstone	43 min
Aug 6, 5:14 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Big Horn, Yellowstone	61 min
Aug 6, 5:17 PM MDT	Severe Thunderstorm Warning	TFX	Glacier	43 min
Aug 6, 5:19 PM MDT	Severe Thunderstorm Warning	TFX	Gallatin	11 min
Aug 6, 5:27 PM MDT	Severe Thunderstorm Warning	BYZ	Park, Sweet Grass	37 min
Aug 6, 5:27 PM MDT	Severe Thunderstorm Warning	TFX	Glacier	48 min
Aug 6, 5:30 PM MDT	Severe Thunderstorm Warning	TFX	Glacier	30 min
Aug 6, 5:39 PM MDT	Severe Thunderstorm Warning	MSO	Ravalli	36 min
Aug 6, 5:48 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Big Horn, Rosebud	57 min
Aug 6, 5:58 PM MDT	Severe Thunderstorm Warning	MSO	Missoula	16 min
Aug 6, 6:02 PM MDT	Severe Thunderstorm Warning	MSO	Granite, Missoula, Ravalli	28 min
Aug 6, 6:05 PM MDT	Severe Thunderstorm Warning	TFX	Glacier, Toole	25 min
Aug 6, 6:07 PM MDT	Severe Thunderstorm Warning	TFX	Lewis and Clark	38 min
Aug 6, 6:09 PM MDT	Severe Thunderstorm Warning	TFX	Glacier	51 min
Aug 6, 6:20 PM MDT	Severe Thunderstorm Warning	MSO	Granite, Ravalli	25 min
Aug 6, 6:41 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Lewis and Clark	19 min
Aug 6, 6:45 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn	30 min
Aug 6, 6:45 PM MDT	Severe Thunderstorm Warning	TFX	Glacier, Pondera	45 min
Aug 6, 7:04 PM MDT	Severe Thunderstorm Warning	BYZ	Carbon, Stillwater, Sweet Grass	41 min
Aug 6, 7:23 PM MDT	Severe Thunderstorm Warning	TFX	Pondera, Teton	52 min
Aug 6, 7:43 PM MDT	Severe Thunderstorm Warning	TFX	Glacier, Pondera, Teton, Toole	47 min
Aug 6, 8:23 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau, Teton	52 min
Aug 6, 9:02 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau	43 min
Aug 10, 1:50 PM MDT	Severe Thunderstorm Warning	TFX	Jefferson	40 min
Aug 10, 1:56 PM MDT	Severe Thunderstorm Warning	TFX	Broadwater	49 min
Aug 10, 4:53 PM MDT	Severe Thunderstorm Warning	TFX	Lewis and Clark	37 min
Aug 10, 5:27 PM MDT	Severe Thunderstorm Warning	TFX	Lewis and Clark	33 min
Aug 10, 5:54 PM MDT	Severe Thunderstorm Warning	TFX	Beaverhead, Madison	51 min
Aug 12, 3:20 PM MDT	Severe Thunderstorm Warning	TFX	Glacier, Pondera, Toole	25 min
Aug 12, 3:44 PM MDT	Severe Thunderstorm Warning	TFX	Pondera, Toole	31 min
Aug 12, 3:48 PM MDT	Severe Thunderstorm Warning	TFX	Fergus, Judith Basin	27 min
Aug 12, 4:10 PM MDT	Severe Thunderstorm Warning	BYZ	Park, Sweet Grass	35 min
Aug 12, 4:44 PM MDT	Severe Thunderstorm Warning	TFX	Liberty, Toole	31 min
Aug 12, 4:47 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau	28 min
Aug 12, 5:15 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau	30 min
Aug 12, 5:16 PM MDT	Severe Thunderstorm Warning	TFX	Hill, Liberty	29 min
Aug 12, 8:28 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	16 min
Aug 15, 4:31 PM MDT	Severe Thunderstorm Warning	MSO	Ravalli	44 min
Aug 15, 5:17 PM MDT	Severe Thunderstorm Warning	TFX	Beaverhead, Madison	43 min
Aug 16, 2:44 PM MDT	Severe Thunderstorm Warning	TFX	Pondera, Toole	31 min
Aug 16, 3:15 PM MDT	Severe Thunderstorm Warning	TFX	Pondera, Toole	45 min
Aug 16, 5:01 PM MDT	Severe Thunderstorm Warning	BYZ	Custer, Powder River, Rosebud	44 min
Aug 16, 7:59 PM MDT	Severe Thunderstorm Warning	GGW	Garfield	61 min
Aug 16, 8:56 PM MDT	Severe Thunderstorm Warning	BYZ	Carter	19 min
Aug 18, 5:14 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Beaverhead	31 min
Aug 18, 5:40 PM MDT	Severe Thunderstorm Warning	MSO	Granite, Missoula, Ravalli	35 min
Aug 18, 6:03 PM MDT	Severe Thunderstorm Warning	TFX	Lewis and Clark, Teton	27 min
Aug 18, 6:06 PM MDT	Severe Thunderstorm Warning	MSO	Missoula	39 min
Aug 18, 6:29 PM MDT	Severe Thunderstorm Warning	TFX	Teton	46 min
Aug 18, 6:35 PM MDT	Severe Thunderstorm Warning	MSO	Lake, Missoula, Sanders	40 min
Aug 18, 7:16 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau	44 min
Aug 18, 7:30 PM MDT	Severe Thunderstorm Warning	TFX	Judith Basin	28 min
Aug 18, 7:54 PM MDT	Severe Thunderstorm Warning	TFX	Lewis and Clark	36 min
Aug 18, 8:00 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau	45 min
Aug 18, 8:04 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Cascade, Lewis and Clark, Teton	26 min
Aug 18, 8:41 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau	34 min
Aug 19, 2:24 AM MDT	Severe Thunderstorm Warning	GGW	Phillips	66 min
Aug 19, 2:52 AM MDT	Severe Thunderstorm Warning	TFX	Blaine	23 min
Aug 19, 3:24 AM MDT	Severe Thunderstorm Warning	GGW	Phillips	66 min
Aug 19, 9:51 AM MDT	Severe Thunderstorm Warning	GGW	Garfield	28 min
Aug 19, 4:10 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn	35 min
Aug 19, 4:30 PM MDT	Severe Thunderstorm Warning	MSO	Missoula	30 min
Aug 19, 4:35 PM MDT	Severe Thunderstorm Warning	TFX	Gallatin	40 min
Aug 19, 5:51 PM MDT	Severe Thunderstorm Warning	TFX	Broadwater, Jefferson, Lewis and Clark	24 min
Aug 19, 5:55 PM MDT	Severe Thunderstorm Warning	MSO	Lake, Missoula, Sanders	20 min
Aug 19, 6:27 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau, Fergus, Judith Basin	33 min
Aug 19, 6:55 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau	50 min
Aug 19, 6:59 PM MDT	Severe Thunderstorm Warning	TFX	Pondera, Teton	31 min
Aug 19, 7:13 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau, Teton	47 min
Aug 19, 7:18 PM MDT	Severe Thunderstorm Warning	TFX	Pondera, Toole	57 min
Aug 19, 7:39 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau	51 min
Aug 19, 7:49 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau, Fergus	41 min
Aug 19, 7:54 PM MDT	Severe Thunderstorm Warning	TFX	Glacier, Liberty, Pondera, Toole	66 min
Aug 19, 8:09 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau, Hill, Liberty	51 min
Aug 19, 8:12 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	48 min
Aug 19, 8:35 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau, Liberty, Toole	25 min
Aug 19, 8:56 PM MDT	Severe Thunderstorm Warning	TFX	Blaine, Chouteau, Hill, Liberty, Toole	64 min
Aug 20, 2:03 PM MDT	Severe Thunderstorm Warning	TFX	Beaverhead, Madison	42 min
Aug 20, 2:24 PM MDT	Severe Thunderstorm Warning	TFX	Madison	36 min
Aug 20, 2:47 PM MDT	Severe Thunderstorm Warning	TFX	Madison	43 min
Aug 20, 4:05 PM MDT	Severe Thunderstorm Warning	TFX	Broadwater, Gallatin, Madison, Meagher	25 min
Aug 20, 4:33 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Park, Sweet Grass	42 min
Aug 20, 6:45 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn, Yellowstone	30 min
Aug 20, 9:16 PM MDT	Severe Thunderstorm Warning	GGW	McCone, Phillips, Valley	59 min
Aug 20, 10:15 PM MDT	Severe Thunderstorm Warning	GGW	Valley	60 min
Aug 21, 4:28 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Valley	62 min
Aug 21, 5:45 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau	45 min
Aug 21, 7:07 PM MDT	Severe Thunderstorm Warning	GGW	McCone, Roosevelt, Valley	38 min
Aug 21, 7:20 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, McCone, Richland, Roosevelt	55 min
Aug 21, 7:22 PM MDT	Severe Thunderstorm Warning	BYZ	Custer, Rosebud	23 min
Aug 21, 7:29 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Prairie	61 min
Aug 21, 7:36 PM MDT	Severe Thunderstorm Warning	BYZ	Custer, Rosebud	24 min
Aug 21, 7:42 PM MDT	Severe Thunderstorm Warning	BYZ	Custer, Rosebud	33 min
Aug 21, 7:49 PM MDT	Severe Thunderstorm Warning	GGW	McCone, Richland, Roosevelt	56 min
Aug 21, 7:52 PM MDT	Severe Thunderstorm Warning	BYZ	Custer	23 min
Aug 21, 7:55 PM MDT	Severe Thunderstorm Warning	BYZ	Custer	35 min
Aug 21, 8:05 PM MDT	Severe Thunderstorm Warning	GGW	Prairie	25 min
Aug 21, 8:05 PM MDT	Severe Thunderstorm Warning	TFX	Blaine, Fergus	50 min
Aug 21, 8:10 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Custer	35 min
Aug 21, 8:15 PM MDT	Severe Thunderstorm Warning	GGW	Phillips	60 min
Aug 21, 8:25 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Dawson, Prairie, Wibaux	48 min
Aug 21, 8:34 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Richland, Roosevelt, Sheridan	71 min
Aug 21, 8:40 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Custer	35 min
Aug 21, 9:30 PM MDT	Severe Thunderstorm Warning	BYZ	Carter, Fallon	30 min
Aug 21, 9:44 PM MDT	Severe Thunderstorm Warning	GGW	Richland, Roosevelt, Sheridan	31 min
Aug 21, 9:55 PM MDT	Severe Thunderstorm Warning	BYZ	Carter, Fallon	35 min
Aug 21, 10:06 PM MDT	Severe Thunderstorm Warning	GGW	Richland	24 min
Aug 23, 1:19 AM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Beaverhead, Madison	41 min
Aug 23, 1:56 AM MDT	Severe Thunderstorm Warning	TFX	Beaverhead, Madison	64 min
Aug 23, 1:47 PM MDT	Severe Thunderstorm Warning	TFX	Beaverhead, Madison	43 min
Aug 23, 2:22 PM MDT	Severe Thunderstorm Warning	TFX	Beaverhead, Madison	38 min
Aug 23, 3:17 PM MDT	Severe Thunderstorm Warning Considerable damage threat	MSO	Granite, Missoula, Ravalli	28 min
Aug 23, 3:38 PM MDT	Severe Thunderstorm Warning	MSO	Sanders	37 min
Aug 23, 3:41 PM MDT	Severe Thunderstorm Warning	MSO	Granite, Missoula, Ravalli	34 min
Aug 23, 3:51 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Beaverhead, Madison	39 min
Aug 23, 4:09 PM MDT	Severe Thunderstorm Warning	MSO	Lake, Mineral, Missoula, Sanders	36 min
Aug 23, 4:09 PM MDT	Severe Thunderstorm Warning	TFX	Jefferson, Lewis and Clark	36 min
Aug 23, 4:32 PM MDT	Severe Thunderstorm Warning	TFX	Beaverhead, Gallatin, Madison	43 min
Aug 23, 4:40 PM MDT	Severe Thunderstorm Warning	MSO	Lake, Missoula, Sanders	35 min
Aug 23, 4:45 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Lewis and Clark	30 min
Aug 23, 4:56 PM MDT	Severe Thunderstorm Warning	GGW	Valley	34 min
Aug 23, 4:59 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Lewis and Clark, Teton	31 min
Aug 23, 5:04 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Cascade, Chouteau, Judith Basin, Teton	26 min
Aug 23, 5:13 PM MDT	Severe Thunderstorm Warning	MSO	Flathead, Lake, Lincoln, Sanders	32 min
Aug 23, 5:23 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Blaine, Cascade, Chouteau, Fergus, Judith Basin	67 min
Aug 23, 5:26 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Valley	19 min
Aug 23, 5:27 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Cascade, Chouteau, Glacier, Lewis and Clark, Liberty, Pondera and 2 more	63 min
Aug 23, 5:52 PM MDT	Severe Thunderstorm Warning Destructive damage threat	TFX	Pondera, Teton, Toole	38 min
Aug 23, 6:11 PM MDT	Severe Thunderstorm Warning Destructive damage threat	TFX	Blaine, Chouteau, Glacier, Hill, Liberty, Pondera and 1 more	64 min
Aug 23, 6:13 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Valley	32 min
Aug 23, 6:16 PM MDT	Severe Thunderstorm Warning	TFX	Blaine, Chouteau, Fergus, Hill	59 min
Aug 23, 7:00 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Valley	30 min
Aug 23, 7:26 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Valley	49 min
Aug 23, 8:21 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Valley	24 min
Aug 24, 4:40 PM MDT	Severe Thunderstorm Warning	GGW	Daniels	50 min
Aug 24, 5:25 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Sheridan	65 min
Aug 24, 5:35 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Sheridan	40 min
Aug 24, 6:05 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Sheridan	55 min
Aug 24, 7:38 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Sheridan	67 min
Aug 24, 8:24 PM MDT	Severe Thunderstorm Warning	GGW	Sheridan	27 min
Aug 24, 10:35 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, McCone	40 min
Aug 24, 11:04 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, McCone, Roosevelt, Valley	56 min
Aug 24, 11:51 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Daniels, Dawson, Garfield, McCone, Richland, Roosevelt and 2 more	69 min
Aug 25, 12:52 AM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Daniels, McCone, Richland, Roosevelt, Sheridan	53 min
Aug 25, 1:41 AM MDT	Severe Thunderstorm Warning	GGW	Daniels, Sheridan	49 min
Sep 3, 12:58 PM MDT	Severe Thunderstorm Warning	MSO	Granite	32 min
Sep 3, 2:58 PM MDT	Severe Thunderstorm Warning	BYZ	Carbon, Stillwater	32 min
Sep 3, 3:15 PM MDT	Severe Thunderstorm Warning	BYZ	Stillwater, Yellowstone	45 min
Sep 3, 3:59 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn, Yellowstone	46 min
Sep 11, 4:52 PM MDT	Severe Thunderstorm Warning	MSO	Deer Lodge, Silver Bow	23 min
Sep 11, 5:55 PM MDT	Severe Thunderstorm Warning	TFX	Broadwater, Jefferson, Lewis and Clark	35 min
Sep 11, 6:13 PM MDT	Severe Thunderstorm Warning	TFX	Broadwater, Cascade, Lewis and Clark, Meagher	32 min
Sep 11, 6:45 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Cascade, Chouteau, Judith Basin, Meagher	30 min
Sep 11, 7:30 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Broadwater, Gallatin, Meagher	30 min
Sep 12, 11:35 AM MDT	Severe Thunderstorm Warning	BYZ	Big Horn	25 min
Sep 12, 12:18 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn	38 min
Sep 12, 2:18 PM MDT	Severe Thunderstorm Warning	BYZ	Stillwater	42 min
Sep 12, 3:17 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Big Horn	28 min
Sep 12, 4:09 PM MDT	Severe Thunderstorm Warning	BYZ	Powder River, Rosebud	36 min
Sep 12, 4:28 PM MDT	Severe Thunderstorm Warning	BYZ	Powder River	32 min
Sep 12, 4:52 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Custer, Powder River	23 min
Sep 12, 5:33 PM MDT	Severe Thunderstorm Warning	BYZ	Custer	27 min
Sep 12, 5:55 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Dawson, Prairie, Wibaux	65 min
Sep 12, 6:51 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Richland, Roosevelt, Wibaux	33 min
Sep 17, 4:57 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Richland	63 min
Sep 17, 5:16 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Roosevelt, Sheridan	59 min
Sep 17, 5:44 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, McCone, Richland, Roosevelt	61 min
Sep 17, 5:56 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Dawson, McCone, Richland	37 min
Sep 17, 6:13 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Daniels, Roosevelt	32 min
Sep 17, 6:41 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, McCone, Richland, Roosevelt, Sheridan, Valley	64 min
Sep 17, 7:06 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Roosevelt, Valley	39 min
Sep 20, 2:24 PM MDT	Severe Thunderstorm Warning	TFX	Hill, Liberty, Toole	66 min
Sep 20, 3:07 PM MDT	Severe Thunderstorm Warning	TFX	Hill, Liberty	53 min
Sep 20, 4:01 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Hill	29 min
Sep 20, 6:09 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, McCone, Valley	66 min
Sep 20, 6:55 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Garfield, McCone, Roosevelt, Valley	65 min
Sep 20, 7:44 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Dawson, McCone, Richland, Roosevelt	61 min
Sep 25, 6:54 PM MDT	Severe Thunderstorm Warning	MSO	Mineral, Sanders	36 min

By county

Every county with at least one alert. A county page lists each alert that covered it.

16 more counties

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record The radar archive 2023 2025

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.