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

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Severe thunderstorm warnings26013249%34074%25 min

Each office's whole area, 2014

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Great Falls, MT: severe thunderstorm warnings422345%6763%22 min
NWS Missoula, MT: severe thunderstorm warnings10460%1822%13 min
NWS Billings, MT: severe thunderstorm warnings1205653%15177%25 min
NWS Glasgow, MT: severe thunderstorm warnings985148%11977%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.

IssuedProductOfficeCountiesLasted
Apr 18, 6:26 PM MDTSevere Thunderstorm WarningGGWGarfield, McCone, Roosevelt, Valley64 min
May 4, 3:07 PM MDTSevere Thunderstorm WarningTFXCascade38 min
May 4, 3:44 PM MDTSevere Thunderstorm WarningTFXCascade, Chouteau46 min
May 5, 4:53 PM MDTSevere Thunderstorm WarningBYZBig Horn, Yellowstone67 min
May 5, 5:51 PM MDTSevere Thunderstorm WarningBYZBig Horn, Rosebud54 min
May 15, 7:11 PM MDTSevere Thunderstorm WarningTFXCascade, Teton49 min
May 15, 7:54 PM MDTSevere Thunderstorm WarningTFXCascade, Meagher51 min
May 18, 2:06 PM MDTSevere Thunderstorm WarningBYZMusselshell54 min
May 18, 3:08 PM MDTSevere Thunderstorm WarningBYZSweet Grass37 min
May 18, 3:33 PM MDTSevere Thunderstorm WarningBYZGolden Valley, Stillwater, Sweet Grass57 min
May 18, 4:24 PM MDTSevere Thunderstorm WarningBYZCarbon, Stillwater, Yellowstone51 min
May 18, 4:47 PM MDTSevere Thunderstorm WarningBYZYellowstone58 min
May 18, 5:20 PM MDTSevere Thunderstorm WarningBYZCarter, Powder River55 min
May 18, 5:25 PM MDTSevere Thunderstorm WarningBYZBig Horn, Treasure, Yellowstone65 min
May 18, 5:42 PM MDTSevere Thunderstorm WarningBYZYellowstone33 min
May 18, 6:14 PM MDTSevere Thunderstorm WarningBYZCarter, Powder River61 min
May 18, 6:20 PM MDTSevere Thunderstorm WarningBYZBig Horn, Rosebud, Treasure, Yellowstone55 min
May 18, 7:00 PM MDTSevere Thunderstorm WarningBYZCarter, Custer, Powder River, Rosebud, Treasure60 min
May 18, 7:52 PM MDTSevere Thunderstorm WarningBYZCarter, Custer, Powder River, Rosebud53 min
May 18, 8:40 PM MDTSevere Thunderstorm WarningBYZCarter, Custer, Fallon, Powder River65 min
May 22, 9:28 PM MDTSevere Thunderstorm WarningBYZPowder River62 min
May 23, 5:11 PM MDTSevere Thunderstorm WarningBYZPowder River, Rosebud64 min
May 23, 6:03 PM MDTSevere Thunderstorm WarningBYZCuster, Powder River, Rosebud57 min
May 24, 2:45 PM MDTSevere Thunderstorm WarningGGWMcCone60 min
May 24, 3:07 PM MDTSevere Thunderstorm WarningGGWMcCone53 min
May 24, 4:44 PM MDTSevere Thunderstorm WarningGGWDaniels, Roosevelt61 min
May 24, 5:39 PM MDTSevere Thunderstorm WarningBYZBig Horn51 min
May 26, 1:49 PM MDTSevere Thunderstorm WarningGGWSheridan56 min
May 26, 2:44 PM MDTSevere Thunderstorm WarningGGWSheridan61 min
May 26, 3:08 PM MDTSevere Thunderstorm WarningTFXFergus52 min
May 26, 3:25 PM MDTSevere Thunderstorm WarningGGWPetroleum65 min
May 26, 3:46 PM MDTSevere Thunderstorm WarningGGWRichland, Roosevelt59 min
May 26, 7:16 PM MDTSevere Thunderstorm WarningGGWPrairie59 min
May 26, 7:57 PM MDTSevere Thunderstorm WarningBYZStillwater, Yellowstone63 min
May 26, 8:45 PM MDTSevere Thunderstorm WarningBYZBig Horn, Yellowstone60 min
May 27, 10:21 PM MDTSevere Thunderstorm WarningBYZGolden Valley, Musselshell54 min
May 27, 11:13 PM MDTSevere Thunderstorm WarningBYZMusselshell62 min
May 28, 12:14 AM MDTSevere Thunderstorm WarningBYZMusselshell, Rosebud, Treasure, Yellowstone61 min
May 28, 2:24 AM MDTSevere Thunderstorm WarningBYZCuster, Rosebud66 min
May 28, 4:31 PM MDTSevere Thunderstorm WarningBYZBig Horn, Treasure, Yellowstone59 min
May 28, 4:36 PM MDTSevere Thunderstorm WarningTFXCascade, Chouteau, Teton39 min
May 28, 4:47 PM MDTSevere Thunderstorm WarningTFXCascade43 min
May 28, 5:24 PM MDTSevere Thunderstorm WarningTFXCascade, Chouteau, Liberty51 min
May 28, 5:38 PM MDTSevere Thunderstorm WarningBYZRosebud67 min
May 28, 5:39 PM MDTSevere Thunderstorm WarningTFXCascade, Chouteau51 min
May 28, 5:49 PM MDTSevere Thunderstorm WarningTFXCascade, Chouteau, Judith Basin56 min
May 28, 6:15 PM MDTSevere Thunderstorm WarningTFXBlaine, Chouteau, Fergus, Hill60 min
May 28, 6:48 PM MDTSevere Thunderstorm WarningTFXChouteau, Fergus, Judith Basin57 min
May 28, 7:13 PM MDTSevere Thunderstorm WarningTFXBlaine, Chouteau, Hill62 min
May 28, 7:47 PM MDTSevere Thunderstorm WarningGGWDawson, McCone, Prairie58 min
May 28, 8:07 PM MDTSevere Thunderstorm WarningTFXBlaine38 min
May 28, 8:34 PM MDTSevere Thunderstorm WarningGGWPhillips, Valley56 min
May 28, 8:56 PM MDTSevere Thunderstorm WarningGGWDawson, McCone, Richland64 min
May 28, 9:25 PM MDTSevere Thunderstorm WarningGGWPhillips, Valley65 min
May 31, 2:45 PM MDTSevere Thunderstorm WarningBYZRosebud60 min
May 31, 3:41 PM MDTSevere Thunderstorm WarningGGWValley64 min
May 31, 3:48 PM MDTSevere Thunderstorm WarningGGWValley27 min
May 31, 3:56 PM MDTSevere Thunderstorm WarningGGWGarfield, McCone64 min
May 31, 4:07 PM MDTSevere Thunderstorm WarningBYZCuster, Rosebud53 min
May 31, 4:37 PM MDTSevere Thunderstorm WarningBYZBig Horn, Rosebud53 min
May 31, 5:05 PM MDTSevere Thunderstorm WarningGGWDaniels, McCone, Roosevelt, Sheridan55 min
May 31, 5:12 PM MDTSevere Thunderstorm WarningBYZCuster, Powder River, Rosebud63 min
May 31, 5:12 PM MDTSevere Thunderstorm WarningGGWMcCone63 min
May 31, 5:16 PM MDTSevere Thunderstorm WarningBYZRosebud59 min
May 31, 5:29 PM MDTSevere Thunderstorm WarningGGWGarfield, McCone61 min
May 31, 5:38 PM MDTSevere Thunderstorm WarningBYZBig Horn37 min
May 31, 6:09 PM MDTSevere Thunderstorm WarningBYZCuster, Powder River, Rosebud66 min
May 31, 6:22 PM MDTSevere Thunderstorm WarningGGWGarfield, McCone53 min
May 31, 7:29 PM MDTSevere Thunderstorm WarningGGWMcCone61 min
Jun 3, 12:59 PM MDTSevere Thunderstorm WarningBYZCarter, Fallon37 min
Jun 3, 1:33 PM MDTSevere Thunderstorm WarningTFXFergus, Judith Basin42 min
Jun 3, 2:07 PM MDTSevere Thunderstorm WarningTFXFergus38 min
Jun 3, 2:29 PM MDTSevere Thunderstorm WarningTFXFergus46 min
Jun 3, 2:59 PM MDTSevere Thunderstorm WarningBYZWheatland61 min
Jun 3, 3:05 PM MDTSevere Thunderstorm WarningTFXFergus40 min
Jun 3, 3:07 PM MDTSevere Thunderstorm WarningBYZCarter23 min
Jun 3, 3:43 PM MDTSevere Thunderstorm WarningTFXFergus47 min
Jun 3, 3:58 PM MDTSevere Thunderstorm WarningGGWPetroleum52 min
Jun 3, 4:02 PM MDTSevere Thunderstorm WarningBYZGolden Valley, Wheatland32 min
Jun 3, 7:40 PM MDTSevere Thunderstorm WarningBYZRosebud, Treasure50 min
Jun 3, 7:42 PM MDTSevere Thunderstorm WarningGGWValley36 min
Jun 3, 8:10 PM MDTSevere Thunderstorm WarningBYZCuster, Rosebud25 min
Jun 3, 8:29 PM MDTSevere Thunderstorm WarningBYZRosebud61 min
Jun 3, 9:23 PM MDTSevere Thunderstorm WarningBYZRosebud37 min
Jun 4, 1:34 PM MDTSevere Thunderstorm WarningBYZCarter, Powder River56 min
Jun 4, 2:22 PM MDTSevere Thunderstorm WarningBYZBig Horn, Powder River, Rosebud53 min
Jun 4, 2:27 PM MDTSevere Thunderstorm WarningBYZCarter63 min
Jun 4, 2:55 PM MDTSevere Thunderstorm WarningBYZPowder River35 min
Jun 4, 2:56 PM MDTSevere Thunderstorm WarningBYZCarter23 min
Jun 4, 3:10 PM MDTSevere Thunderstorm WarningBYZCarter50 min
Jun 4, 3:29 PM MDTSevere Thunderstorm WarningBYZCarter, Powder River31 min
Jun 4, 3:59 PM MDTSevere Thunderstorm WarningBYZCarter, Powder River46 min
Jun 10, 2:59 PM MDTSevere Thunderstorm WarningBYZGolden Valley, Musselshell, Stillwater, Yellowstone30 min
Jun 10, 3:45 PM MDTSevere Thunderstorm WarningBYZBig Horn, Yellowstone32 min
Jun 10, 5:52 PM MDTSevere Thunderstorm WarningBYZCarter, Powder River53 min
Jun 12, 11:05 PM MDTSevere Thunderstorm WarningTFXCascade, Chouteau, Teton40 min
Jun 13, 1:49 AM MDTSevere Thunderstorm WarningTFXCascade, Lewis and Clark41 min
Jun 13, 2:40 AM MDTSevere Thunderstorm WarningTFXCascade, Judith Basin50 min
Jun 13, 2:42 PM MDTSevere Thunderstorm WarningBYZPowder River33 min
Jun 13, 3:15 PM MDTSevere Thunderstorm WarningBYZPowder River30 min
Jun 13, 5:58 PM MDTSevere Thunderstorm WarningGGWGarfield, McCone, Valley46 min
Jun 13, 8:04 PM MDTSevere Thunderstorm WarningGGWRoosevelt, Sheridan29 min
Jun 16, 4:06 PM MDTSevere Thunderstorm WarningBYZBig Horn24 min
Jun 16, 4:29 PM MDTSevere Thunderstorm WarningBYZBig Horn61 min
Jun 16, 4:43 PM MDTSevere Thunderstorm WarningBYZBig Horn62 min
Jun 16, 6:05 PM MDTSevere Thunderstorm WarningGGWDawson, McCone55 min
Jun 16, 6:57 PM MDTSevere Thunderstorm WarningGGWDawson63 min
Jun 16, 7:57 PM MDTSevere Thunderstorm WarningGGWDawson63 min
Jun 17, 4:18 AM MDTSevere Thunderstorm WarningBYZCuster, Rosebud42 min
Jun 17, 4:55 AM MDTSevere Thunderstorm WarningGGWGarfield, Prairie65 min
Jun 17, 6:21 AM MDTSevere Thunderstorm WarningGGWMcCone, Prairie54 min
Jun 17, 7:43 AM MDTSevere Thunderstorm WarningGGWMcCone62 min
Jun 17, 1:02 PM MDTSevere Thunderstorm WarningBYZCuster, Fallon43 min
Jun 17, 1:07 PM MDTSevere Thunderstorm WarningGGWDawson, Prairie, Wibaux53 min
Jun 17, 1:26 PM MDTSevere Thunderstorm WarningGGWDawson, McCone, Prairie64 min
Jun 17, 1:41 PM MDTSevere Thunderstorm WarningBYZCuster, Fallon64 min
Jun 17, 1:51 PM MDTSevere Thunderstorm WarningGGWDawson, Prairie, Wibaux54 min
Jun 17, 2:17 PM MDTSevere Thunderstorm WarningGGWDawson, Prairie58 min
Jun 17, 2:21 PM MDTSevere Thunderstorm WarningGGWDawson, McCone54 min
Jun 17, 2:23 PM MDTSevere Thunderstorm WarningBYZCarter, Fallon52 min
Jun 17, 2:35 PM MDTSevere Thunderstorm WarningBYZCuster, Fallon55 min
Jun 17, 3:45 PM MDTSevere Thunderstorm WarningBYZCarter45 min
Jun 17, 3:53 PM MDTSevere Thunderstorm WarningGGWDawson67 min
Jun 17, 4:00 PM MDTSevere Thunderstorm WarningBYZCarter30 min
Jun 17, 4:01 PM MDTSevere Thunderstorm WarningBYZFallon44 min
Jun 17, 4:01 PM MDTSevere Thunderstorm WarningGGWGarfield, Valley59 min
Jun 17, 4:12 PM MDTSevere Thunderstorm WarningGGWDawson, Prairie, Wibaux63 min
Jun 17, 4:31 PM MDTSevere Thunderstorm WarningBYZCarter29 min
Jun 17, 4:42 PM MDTSevere Thunderstorm WarningBYZFallon33 min
Jun 17, 5:13 PM MDTSevere Thunderstorm WarningGGWDaniels, Valley62 min
Jun 17, 5:56 PM MDTSevere Thunderstorm WarningGGWGarfield, McCone, Valley64 min
Jun 17, 8:20 PM MDTSevere Thunderstorm WarningBYZPowder River, Rosebud55 min
Jun 17, 9:11 PM MDTSevere Thunderstorm WarningBYZCuster34 min
Jun 17, 9:12 PM MDTSevere Thunderstorm WarningBYZCuster, Powder River63 min
Jun 17, 9:32 PM MDTSevere Thunderstorm WarningGGWDawson, Prairie58 min
Jun 17, 10:20 PM MDTSevere Thunderstorm WarningGGWMcCone55 min
Jun 25, 3:41 PM MDTSevere Thunderstorm WarningBYZCarter, Powder River64 min
Jun 25, 3:44 PM MDTSevere Thunderstorm WarningBYZCarter, Powder River61 min
Jun 25, 4:44 PM MDTSevere Thunderstorm WarningBYZCarter31 min
Jun 25, 9:05 PM MDTSevere Thunderstorm WarningBYZBig Horn40 min
Jun 25, 9:44 PM MDTSevere Thunderstorm WarningBYZBig Horn46 min
Jun 25, 10:28 PM MDTSevere Thunderstorm WarningBYZBig Horn47 min
Jun 26, 3:28 PM MDTSevere Thunderstorm WarningBYZPowder River, Rosebud50 min
Jun 26, 4:32 PM MDTSevere Thunderstorm WarningGGWDawson, Prairie25 min
Jun 26, 5:14 PM MDTSevere Thunderstorm WarningBYZGolden Valley, Stillwater, Wheatland61 min
Jun 26, 6:32 PM MDTSevere Thunderstorm WarningBYZCuster, Fallon58 min
Jun 26, 7:31 PM MDTSevere Thunderstorm WarningBYZBig Horn, Powder River44 min
Jun 26, 9:46 PM MDTSevere Thunderstorm WarningBYZFallon44 min
Jun 26, 10:10 PM MDTSevere Thunderstorm WarningGGWDawson, McCone, Prairie22 min
Jun 27, 5:26 PM MDTSevere Thunderstorm WarningBYZCarter64 min
Jul 3, 7:16 PM MDTSevere Thunderstorm WarningTFXChouteau44 min
Jul 3, 8:00 PM MDTSevere Thunderstorm WarningTFXChouteau60 min
Jul 6, 5:18 PM MDTSevere Thunderstorm WarningGGWSheridan57 min
Jul 10, 8:25 PM MDTSevere Thunderstorm WarningGGWValley35 min
Jul 10, 8:57 PM MDTSevere Thunderstorm WarningGGWValley19 min
Jul 10, 10:40 PM MDTSevere Thunderstorm WarningTFXGlacier50 min
Jul 11, 1:12 AM MDTSevere Thunderstorm WarningTFXBlaine, Hill48 min
Jul 11, 1:55 AM MDTSevere Thunderstorm WarningTFXBlaine25 min
Jul 11, 2:42 AM MDTSevere Thunderstorm WarningGGWMcCone, Roosevelt, Valley63 min
Jul 11, 5:28 AM MDTSevere Thunderstorm WarningGGWPhillips34 min
Jul 20, 10:52 PM MDTSevere Thunderstorm WarningGGWSheridan8 min
Jul 22, 1:27 PM MDTSevere Thunderstorm WarningBYZRosebud28 min
Jul 22, 2:19 PM MDTSevere Thunderstorm WarningBYZCuster, Rosebud26 min
Jul 22, 2:46 PM MDTSevere Thunderstorm WarningBYZCuster44 min
Jul 22, 3:10 PM MDTSevere Thunderstorm WarningBYZCuster65 min
Jul 22, 3:40 PM MDTSevere Thunderstorm WarningBYZCarter65 min
Jul 22, 3:56 PM MDTSevere Thunderstorm WarningGGWPrairie29 min
Jul 22, 3:58 PM MDTSevere Thunderstorm WarningBYZCuster62 min
Jul 22, 4:02 PM MDTSevere Thunderstorm WarningBYZFallon43 min
Jul 22, 4:03 PM MDTSevere Thunderstorm WarningBYZCarter57 min
Jul 22, 4:04 PM MDTSevere Thunderstorm WarningBYZFallon56 min
Jul 22, 4:26 PM MDTSevere Thunderstorm WarningBYZFallon49 min
Jul 22, 4:35 PM MDTSevere Thunderstorm WarningTFXCascade, Meagher40 min
Jul 22, 4:36 PM MDTSevere Thunderstorm WarningBYZCuster, Fallon43 min
Jul 22, 4:44 PM MDTSevere Thunderstorm WarningBYZCarter61 min
Jul 22, 4:59 PM MDTSevere Thunderstorm WarningBYZCarter, Fallon61 min
Jul 22, 5:20 PM MDTSevere Thunderstorm WarningBYZStillwater, Sweet Grass55 min
Jul 22, 5:29 PM MDTSevere Thunderstorm WarningBYZCarter, Fallon31 min
Jul 22, 5:44 PM MDTSevere Thunderstorm WarningBYZCarter31 min
Jul 22, 5:54 PM MDTSevere Thunderstorm WarningBYZCarbon, Stillwater66 min
Jul 22, 6:26 PM MDTSevere Thunderstorm WarningBYZBig Horn, Carbon, Yellowstone64 min
Jul 22, 7:25 PM MDTSevere Thunderstorm WarningBYZBig Horn, Yellowstone65 min
Jul 22, 8:21 PM MDTSevere Thunderstorm WarningBYZBig Horn, Rosebud54 min
Jul 22, 8:40 PM MDTSevere Thunderstorm WarningTFXPondera, Teton50 min
Jul 23, 6:09 PM MDTSevere Thunderstorm WarningMSOLincoln, Sanders36 min
Jul 23, 6:43 PM MDTSevere Thunderstorm WarningMSOLincoln47 min
Jul 23, 7:43 PM MDTSevere Thunderstorm WarningMSOGranite, Powell29 min
Jul 23, 7:57 PM MDTSevere Thunderstorm WarningMSOSilver Bow36 min
Jul 23, 8:09 PM MDTSevere Thunderstorm WarningBYZPowder River66 min
Jul 23, 8:11 PM MDTSevere Thunderstorm WarningMSOGranite, Powell23 min
Jul 23, 9:30 PM MDTSevere Thunderstorm WarningGGWPhillips15 min
Jul 23, 10:27 PM MDTSevere Thunderstorm WarningTFXFergus, Judith Basin48 min
Jul 23, 10:40 PM MDTSevere Thunderstorm WarningTFXBlaine50 min
Jul 23, 10:49 PM MDTSevere Thunderstorm WarningGGWPhillips46 min
Jul 23, 11:06 PM MDTSevere Thunderstorm WarningGGWPhillips, Valley14 min
Jul 23, 11:28 PM MDTSevere Thunderstorm WarningTFXBlaine47 min
Jul 24, 12:11 AM MDTSevere Thunderstorm WarningGGWPhillips64 min
Jul 24, 12:14 AM MDTSevere Thunderstorm WarningTFXBlaine46 min
Jul 24, 1:25 AM MDTSevere Thunderstorm WarningGGWGarfield65 min
Jul 24, 1:35 AM MDTSevere Thunderstorm WarningGGWPhillips, Valley55 min
Jul 24, 2:09 AM MDTSevere Thunderstorm WarningGGWGarfield44 min
Jul 24, 2:13 AM MDTSevere Thunderstorm WarningGGWDaniels, Valley62 min
Jul 24, 2:23 AM MDTSevere Thunderstorm WarningGGWGarfield, McCone67 min
Jul 24, 2:36 AM MDTSevere Thunderstorm WarningGGWDawson, Garfield, McCone, Prairie54 min
Jul 24, 2:42 AM MDTSevere Thunderstorm WarningGGWDaniels, Roosevelt, Valley63 min
Jul 24, 3:14 AM MDTSevere Thunderstorm WarningGGWDaniels, Dawson, McCone, Richland, Roosevelt, Sheridan61 min
Jul 24, 4:08 AM MDTSevere Thunderstorm WarningGGWRichland, Roosevelt, Sheridan22 min
Jul 24, 3:47 PM MDTSevere Thunderstorm WarningGGWGarfield58 min
Jul 24, 4:17 PM MDTSevere Thunderstorm WarningGGWPhillips, Valley28 min
Jul 24, 4:32 PM MDTSevere Thunderstorm WarningGGWGarfield, McCone58 min
Jul 24, 4:35 PM MDTSevere Thunderstorm WarningGGWValley40 min
Jul 24, 4:37 PM MDTSevere Thunderstorm WarningGGWGarfield, McCone, Phillips, Valley38 min
Jul 24, 5:07 PM MDTSevere Thunderstorm WarningGGWDaniels, Valley53 min
Jul 24, 5:20 PM MDTSevere Thunderstorm WarningGGWDaniels, Roosevelt, Valley55 min
Jul 24, 5:26 PM MDTSevere Thunderstorm WarningGGWDawson, McCone, Richland64 min
Jul 24, 5:35 PM MDTSevere Thunderstorm WarningGGWDawson, Garfield, McCone, Richland, Roosevelt, Valley55 min
Jul 24, 5:39 PM MDTSevere Thunderstorm WarningGGWDaniels, Roosevelt, Sheridan66 min
Jul 24, 6:00 PM MDTSevere Thunderstorm WarningBYZCarter60 min
Jul 24, 6:07 PM MDTSevere Thunderstorm WarningGGWRoosevelt, Sheridan38 min
Jul 24, 6:17 PM MDTSevere Thunderstorm WarningGGWDawson, Richland, Wibaux31 min
Jul 24, 6:31 PM MDTSevere Thunderstorm WarningGGWDaniels, Richland, Roosevelt, Sheridan59 min
Jul 24, 6:53 PM MDTSevere Thunderstorm WarningGGWDawson, Wibaux54 min
Jul 24, 7:18 PM MDTSevere Thunderstorm WarningGGWRichland, Roosevelt27 min
Jul 24, 7:38 PM MDTSevere Thunderstorm WarningGGWRichland, Roosevelt16 min
Aug 3, 5:54 PM MDTSevere Thunderstorm WarningGGWMcCone66 min
Aug 3, 6:20 PM MDTSevere Thunderstorm WarningGGWPhillips40 min
Aug 3, 6:54 PM MDTSevere Thunderstorm WarningGGWDawson, McCone, Prairie66 min
Aug 3, 6:59 PM MDTSevere Thunderstorm WarningGGWGarfield, Petroleum, Phillips61 min
Aug 3, 7:50 PM MDTSevere Thunderstorm WarningGGWDawson, McCone, Prairie55 min
Aug 3, 7:54 PM MDTSevere Thunderstorm WarningGGWGarfield, Phillips66 min
Aug 3, 8:37 PM MDTSevere Thunderstorm WarningGGWPrairie37 min
Aug 3, 8:45 PM MDTSevere Thunderstorm WarningGGWGarfield, Petroleum, Phillips45 min
Aug 3, 8:49 PM MDTSevere Thunderstorm WarningGGWGarfield56 min
Aug 4, 7:38 PM MDTSevere Thunderstorm WarningTFXGlacier37 min
Aug 9, 2:46 PM MDTSevere Thunderstorm WarningGGWPrairie34 min
Aug 15, 12:05 PM MDTSevere Thunderstorm WarningMSODeer Lodge, Powell25 min
Aug 15, 12:08 PM MDTSevere Thunderstorm WarningMSODeer Lodge, Powell, Silver Bow22 min
Aug 15, 12:34 PM MDTSevere Thunderstorm WarningTFXLewis and Clark28 min
Aug 15, 12:57 PM MDTSevere Thunderstorm WarningTFXLewis and Clark48 min
Aug 15, 1:36 PM MDTSevere Thunderstorm WarningTFXBroadwater, Jefferson, Lewis and Clark39 min
Aug 15, 2:06 PM MDTSevere Thunderstorm WarningTFXCascade, Meagher39 min
Aug 15, 2:49 PM MDTSevere Thunderstorm WarningGGWPhillips38 min
Aug 15, 3:29 PM MDTSevere Thunderstorm WarningTFXCascade, Chouteau, Judith Basin46 min
Aug 15, 4:04 PM MDTSevere Thunderstorm WarningTFXChouteau, Fergus, Judith Basin41 min
Aug 15, 6:26 PM MDTSevere Thunderstorm WarningBYZYellowstone24 min
Aug 15, 7:34 PM MDTSevere Thunderstorm WarningBYZBig Horn41 min
Aug 15, 7:44 PM MDTSevere Thunderstorm WarningGGWPetroleum, Phillips47 min
Aug 15, 7:52 PM MDTSevere Thunderstorm WarningMSODeer Lodge, Powell, Silver Bow53 min
Aug 15, 9:55 PM MDTSevere Thunderstorm WarningGGWGarfield, McCone, Prairie35 min
Aug 21, 7:39 PM MDTSevere Thunderstorm WarningBYZCarter36 min
Aug 22, 6:42 PM MDTSevere Thunderstorm WarningBYZPowder River33 min
Aug 28, 7:40 PM MDTSevere Thunderstorm WarningTFXBlaine50 min
Aug 28, 8:28 PM MDTSevere Thunderstorm WarningTFXBlaine47 min
Aug 28, 8:59 PM MDTSevere Thunderstorm WarningGGWPhillips35 min
Aug 28, 10:13 PM MDTSevere Thunderstorm WarningGGWPhillips, Valley47 min
Aug 30, 6:07 PM MDTSevere Thunderstorm WarningBYZCarter, Fallon41 min
Sep 3, 5:40 PM MDTSevere Thunderstorm WarningGGWDaniels, Roosevelt, Sheridan65 min
Sep 3, 6:29 PM MDTSevere Thunderstorm WarningGGWDaniels, Roosevelt, Sheridan61 min
Sep 18, 4:02 PM MDTSevere Thunderstorm WarningBYZPark43 min
Sep 18, 4:28 PM MDTSevere Thunderstorm WarningBYZCarbon, Stillwater, Sweet Grass46 min

By county

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

7 more counties

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.