Alert archive / Montana / Severe Thunderstorm Warnings / 2026

Severe Thunderstorm Warnings in Montana, May 2026

41 severe thunderstorm warnings in May 2026. 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 May 2026. Tap one for its archive.

Severe Thunderstorm Warnings: 41
Busiest day: May 13, 202615 severe thunderstorm warnings

Over time

By day

Days in UTC, the clock the archive keeps.

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 13, 1:59 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Lewis and Clark	35 min
May 13, 2:13 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Beaverhead, Madison	47 min
May 13, 2:46 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau, Fergus, Judith Basin	44 min
May 13, 2:50 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Cascade, Chouteau, Teton	40 min
May 13, 2:59 PM MDT	Severe Thunderstorm Warning	TFX	Broadwater, Jefferson	46 min
May 13, 3:28 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Blaine, Cascade, Chouteau, Fergus, Hill, Judith Basin and 1 more	47 min
May 13, 3:58 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Park, Stillwater, Sweet Grass	62 min
May 13, 4:08 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Blaine, Chouteau, Fergus, Hill, Liberty	97 min
May 13, 4:41 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Golden Valley, Wheatland	64 min
May 13, 4:41 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Petroleum, Phillips	64 min
May 13, 5:17 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn, Rosebud	43 min
May 13, 5:22 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	38 min
May 13, 5:26 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Garfield, Petroleum, Phillips	64 min
May 13, 5:42 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Phillips, Valley	63 min
May 13, 5:52 PM MDT	Severe Thunderstorm Warning	BYZ	Park, Sweet Grass	38 min
May 13, 6:05 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	40 min
May 13, 6:17 PM MDT	Severe Thunderstorm Warning	BYZ	Carbon, Stillwater	58 min
May 13, 6:27 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Garfield, Petroleum, Phillips, Valley	63 min
May 13, 6:31 PM MDT	Severe Thunderstorm Warning	BYZ	Sweet Grass	46 min
May 13, 7:29 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	Garfield, McCone, Phillips, Prairie, Valley	61 min
May 13, 10:03 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, Petroleum, Phillips	57 min
May 26, 3:22 PM MDT	Severe Thunderstorm Warning	GGW	McCone, Richland, Roosevelt	38 min
May 26, 3:43 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, McCone, Richland, Roosevelt	62 min
May 26, 3:58 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Roosevelt, Valley	62 min
May 26, 5:15 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, McCone, Richland, Roosevelt	60 min
May 26, 6:03 PM MDT	Severe Thunderstorm Warning	GGW	McCone, Richland, Roosevelt, Valley	57 min
May 26, 6:14 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Broadwater, Jefferson	41 min
May 28, 1:54 AM MDT	Severe Thunderstorm Warning	TFX	Lewis and Clark, Pondera, Teton	42 min
May 28, 5:27 PM MDT	Severe Thunderstorm Warning	TFX	Glacier, Pondera, Toole	33 min
May 28, 5:40 PM MDT	Severe Thunderstorm Warning	MSO	Flathead	35 min
May 28, 6:45 PM MDT	Severe Thunderstorm Warning	MSO	Missoula	30 min
May 29, 4:22 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	23 min
May 29, 4:43 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	32 min
May 29, 6:13 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, Petroleum	62 min
May 29, 6:42 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	48 min
May 29, 7:09 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, Petroleum, Phillips	66 min
May 30, 2:36 PM MDT	Severe Thunderstorm Warning	BYZ	Carter	39 min
May 30, 6:32 PM MDT	Severe Thunderstorm Warning	BYZ	Custer	42 min
May 30, 6:40 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn, Rosebud	50 min
May 30, 7:19 PM MDT	Severe Thunderstorm Warning	BYZ	Custer, Powder River	41 min
May 30, 7:28 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Prairie	62 min

Nearby

Alerts in force now Tornadoes on record The radar archive 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.