Alert archive / Wyoming / Severe Thunderstorm Warnings

Severe Thunderstorm Warnings in Wyoming, 2022

168 severe thunderstorm warnings in 2022. 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 2022. Tap one for its archive.

Severe Thunderstorm Warnings: 168
Busiest month: July63 severe thunderstorm warnings
Busiest day: June 12, 202219 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.

75 of 168 severe thunderstorm warnings covering Wyoming in 2022 had a qualifying storm report inside them; 86 of 144 hail, wind and damage reports fell inside a warning, on average 21 minutes after it went out.

Wyoming, 2022

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Severe thunderstorm warnings	168	75	55%	144	60%	21 min

Each office's whole area, 2022

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Cheyenne, WY: severe thunderstorm warnings	126	60	52%	112	77%	22 min
NWS Billings, MT: severe thunderstorm warnings	119	52	56%	157	65%	29 min
NWS Riverton, WY: severe thunderstorm warnings	25	4	84%	35	20%	13 min
NWS Salt Lake City, UT: severe thunderstorm warnings	108	28	74%	176	27%	22 min
NWS Rapid City, SD: severe thunderstorm warnings	267	178	33%	439	80%	26 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 22, 4:48 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	42 min
Apr 22, 5:27 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	48 min
Apr 22, 6:08 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	52 min
Apr 22, 6:47 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	43 min
Apr 22, 7:25 PM MDT	Severe Thunderstorm Warning	UNR	Weston	65 min
Apr 22, 7:30 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	30 min
May 17, 4:36 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	39 min
May 17, 4:47 PM MDT	Severe Thunderstorm Warning	RIW	Big Horn	43 min
May 17, 5:28 PM MDT	Severe Thunderstorm Warning	RIW	Big Horn	47 min
May 17, 6:15 PM MDT	Severe Thunderstorm Warning	RIW	Big Horn	25 min
May 27, 3:49 PM MDT	Severe Thunderstorm Warning	UNR	Crook	56 min
May 28, 3:08 PM MDT	Severe Thunderstorm Warning	UNR	Campbell, Crook, Weston	67 min
May 28, 4:04 PM MDT	Severe Thunderstorm Warning	UNR	Campbell, Crook	56 min
May 28, 4:38 PM MDT	Severe Thunderstorm Warning	UNR	Crook	37 min
May 29, 3:11 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie, Niobrara	49 min
Jun 3, 3:24 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	36 min
Jun 3, 4:17 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	28 min
Jun 3, 8:06 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	29 min
Jun 4, 7:44 PM MDT	Severe Thunderstorm Warning	BYZ	Sheridan	61 min
Jun 4, 7:44 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Goshen, Niobrara, Platte	46 min
Jun 4, 8:16 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara, Platte	44 min
Jun 4, 8:36 PM MDT	Severe Thunderstorm Warning	UNR	Campbell	39 min
Jun 4, 8:44 PM MDT	Severe Thunderstorm Warning	BYZ	Sheridan	46 min
Jun 6, 1:48 PM MDT	Severe Thunderstorm Warning	UNR	Weston	72 min
Jun 7, 11:36 AM MDT	Severe Thunderstorm Warning	RIW	Fremont, Hot Springs	24 min
Jun 7, 1:15 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	45 min
Jun 7, 1:54 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	51 min
Jun 7, 2:18 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara	42 min
Jun 11, 7:55 PM MDT	Severe Thunderstorm Warning	UNR	Crook	65 min
Jun 11, 8:54 PM MDT	Severe Thunderstorm Warning	UNR	Campbell, Crook, Weston	66 min
Jun 11, 9:08 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	Crook	52 min
Jun 11, 9:35 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	Crook, Weston	55 min
Jun 11, 9:59 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	Weston	46 min
Jun 12, 2:34 PM MDT	Severe Thunderstorm Warning	BYZ	Sheridan	41 min
Jun 12, 2:48 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	Campbell, Crook	57 min
Jun 12, 3:15 PM MDT	Severe Thunderstorm Warning	BYZ	Sheridan	44 min
Jun 12, 3:35 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	40 min
Jun 12, 3:38 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Goshen	52 min
Jun 12, 3:42 PM MDT	Severe Thunderstorm Warning Destructive damage threat	UNR	Campbell, Crook	63 min
Jun 12, 4:08 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	52 min
Jun 12, 4:16 PM MDT	Severe Thunderstorm Warning	RIW	Teton	44 min
Jun 12, 4:30 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	45 min
Jun 12, 4:36 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	Campbell, Crook	24 min
Jun 12, 4:41 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	Crook	64 min
Jun 12, 4:53 PM MDT	Severe Thunderstorm Warning	RIW	Fremont, Park, Teton	25 min
Jun 12, 4:58 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	Crook	47 min
Jun 12, 5:47 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	Crook	43 min
Jun 13, 5:36 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara, Platte	39 min
Jun 13, 5:56 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	49 min
Jun 13, 6:01 PM MDT	Severe Thunderstorm Warning	UNR	Crook, Weston	41 min
Jun 13, 6:06 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Niobrara	39 min
Jun 13, 6:17 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara, Platte	13 min
Jun 13, 6:43 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Niobrara	47 min
Jun 13, 7:17 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	58 min
Jun 17, 1:54 AM MDT	Severe Thunderstorm Warning	CYS	Laramie	51 min
Jun 17, 4:29 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	31 min
Jun 17, 4:38 PM MDT	Severe Thunderstorm Warning	BYZ	Sheridan	37 min
Jun 17, 5:10 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Sheridan	35 min
Jun 19, 4:14 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Sheridan	41 min
Jun 19, 4:45 PM MDT	Severe Thunderstorm Warning	UNR	Campbell	45 min
Jun 19, 5:22 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	Crook	53 min
Jun 20, 12:26 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	49 min
Jun 20, 1:09 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	51 min
Jun 20, 1:15 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara	45 min
Jun 20, 1:52 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	38 min
Jun 20, 2:03 PM MDT	Severe Thunderstorm Warning	RIW	Washakie	17 min
Jun 20, 2:27 PM MDT	Severe Thunderstorm Warning	BYZ	Sheridan	49 min
Jun 20, 2:28 PM MDT	Severe Thunderstorm Warning	UNR	Campbell	44 min
Jun 20, 2:30 PM MDT	Severe Thunderstorm Warning	UNR	Weston	60 min
Jun 20, 2:56 PM MDT	Severe Thunderstorm Warning	UNR	Campbell	49 min
Jun 24, 3:45 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	45 min
Jun 24, 4:20 PM MDT	Severe Thunderstorm Warning	RIW	Johnson, Natrona	25 min
Jun 24, 4:27 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	9 min
Jun 29, 2:34 PM MDT	Severe Thunderstorm Warning	UNR	Crook	56 min
Jun 29, 4:02 PM MDT	Severe Thunderstorm Warning	UNR	Campbell, Crook	58 min
Jun 30, 7:12 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Goshen	33 min
Jul 1, 3:42 PM MDT	Severe Thunderstorm Warning	UNR	Weston	48 min
Jul 1, 4:26 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	49 min
Jul 1, 4:30 PM MDT	Severe Thunderstorm Warning	UNR	Weston	23 min
Jul 1, 4:31 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	59 min
Jul 2, 6:21 PM MDT	Severe Thunderstorm Warning	UNR	Crook, Weston	54 min
Jul 2, 6:35 PM MDT	Severe Thunderstorm Warning	UNR	Weston	40 min
Jul 2, 7:03 PM MDT	Severe Thunderstorm Warning	RIW	Teton	30 min
Jul 3, 6:19 PM MDT	Severe Thunderstorm Warning	BYZ	Sheridan	56 min
Jul 4, 5:30 PM MDT	Severe Thunderstorm Warning	UNR	Weston	34 min
Jul 4, 5:49 PM MDT	Severe Thunderstorm Warning	UNR	Crook, Weston	56 min
Jul 4, 5:56 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	28 min
Jul 4, 6:12 PM MDT	Severe Thunderstorm Warning	UNR	Weston	48 min
Jul 4, 6:44 PM MDT	Severe Thunderstorm Warning	UNR	Crook, Weston	21 min
Jul 4, 6:52 PM MDT	Severe Thunderstorm Warning	UNR	Crook, Weston	53 min
Jul 4, 7:43 PM MDT	Severe Thunderstorm Warning	UNR	Weston	47 min
Jul 4, 8:13 PM MDT	Severe Thunderstorm Warning	UNR	Crook	47 min
Jul 5, 2:37 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara, Platte	38 min
Jul 5, 3:08 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Converse, Goshen, Niobrara, Platte	67 min
Jul 5, 3:56 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara, Platte	49 min
Jul 5, 3:57 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara, Platte	48 min
Jul 5, 4:30 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	45 min
Jul 5, 4:44 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Goshen	61 min
Jul 5, 5:17 PM MDT	Severe Thunderstorm Warning	UNR	Campbell, Weston	58 min
Jul 5, 6:49 PM MDT	Severe Thunderstorm Warning	UNR	Campbell	56 min
Jul 6, 4:02 PM MDT	Severe Thunderstorm Warning	RIW	Big Horn, Park	29 min
Jul 7, 3:18 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	42 min
Jul 7, 3:33 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie, Platte	42 min
Jul 7, 6:50 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	24 min
Jul 8, 3:40 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	50 min
Jul 8, 4:29 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Goshen	46 min
Jul 8, 6:24 PM MDT	Severe Thunderstorm Warning	UNR	Weston	51 min
Jul 8, 7:06 PM MDT	Severe Thunderstorm Warning	UNR	Weston	39 min
Jul 10, 7:51 PM MDT	Severe Thunderstorm Warning	UNR	Campbell, Crook	54 min
Jul 10, 8:35 PM MDT	Severe Thunderstorm Warning	UNR	Crook	70 min
Jul 10, 9:15 PM MDT	Severe Thunderstorm Warning	UNR	Crook	60 min
Jul 10, 11:22 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	27 min
Jul 10, 11:53 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	37 min
Jul 12, 3:27 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	23 min
Jul 14, 6:55 PM MDT	Severe Thunderstorm Warning	UNR	Campbell	48 min
Jul 15, 4:55 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Sheridan	50 min
Jul 15, 5:43 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Sheridan	62 min
Jul 24, 3:44 PM MDT	Severe Thunderstorm Warning	RIW	Big Horn	46 min
Jul 24, 8:48 PM MDT	Severe Thunderstorm Warning Considerable damage threat	RIW	Big Horn, Park	87 min
Jul 27, 4:26 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	19 min
Jul 27, 5:23 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	52 min
Jul 27, 5:46 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	44 min
Jul 27, 6:28 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	47 min
Jul 27, 7:07 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	38 min
Jul 27, 8:03 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	42 min
Jul 27, 8:40 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Goshen, Laramie, Platte	39 min
Jul 27, 9:17 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Goshen, Laramie	43 min
Jul 27, 9:57 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	30 min
Jul 27, 10:36 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	34 min
Jul 28, 4:16 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Laramie, Platte	44 min
Jul 28, 5:27 PM MDT	Severe Thunderstorm Warning	CYS	Albany	48 min
Jul 28, 6:38 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Carbon	52 min
Jul 28, 7:20 PM MDT	Severe Thunderstorm Warning	CYS	Albany	55 min
Jul 29, 5:45 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara	45 min
Jul 29, 7:09 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	51 min
Jul 29, 7:31 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	29 min
Jul 29, 8:00 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	45 min
Jul 29, 8:45 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Goshen, Platte	45 min
Aug 2, 3:22 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	38 min
Aug 5, 5:03 PM MDT	Severe Thunderstorm Warning	RIW	Sublette	42 min
Aug 6, 2:19 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	41 min
Aug 6, 3:02 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	43 min
Aug 6, 3:38 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	21 min
Aug 6, 3:50 PM MDT	Severe Thunderstorm Warning	CYS	Converse	28 min
Aug 6, 4:33 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie, Platte	42 min
Aug 6, 5:14 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie, Platte	34 min
Aug 6, 5:41 PM MDT	Severe Thunderstorm Warning	SLC	Uinta	34 min
Aug 13, 3:03 PM MDT	Severe Thunderstorm Warning	CYS	Albany	29 min
Aug 17, 2:18 PM MDT	Severe Thunderstorm Warning	UNR	Crook	57 min
Aug 24, 3:46 PM MDT	Severe Thunderstorm Warning	RIW	Fremont, Hot Springs	44 min
Aug 24, 5:56 PM MDT	Severe Thunderstorm Warning	RIW	Park	34 min
Aug 24, 6:29 PM MDT	Severe Thunderstorm Warning	RIW	Park	31 min
Aug 25, 5:28 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Converse	47 min
Aug 25, 5:31 PM MDT	Severe Thunderstorm Warning	UNR	Campbell	38 min
Aug 25, 5:39 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara	51 min
Aug 25, 5:46 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Goshen, Niobrara, Platte	13 min
Aug 25, 6:10 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara	50 min
Aug 25, 6:13 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Converse, Niobrara	47 min
Aug 25, 6:35 PM MDT	Severe Thunderstorm Warning	UNR	Campbell, Weston	41 min
Aug 25, 6:54 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Converse, Niobrara	23 min
Aug 25, 6:58 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	18 min
Aug 26, 4:25 PM MDT	Severe Thunderstorm Warning	UNR	Crook	65 min
Aug 26, 4:41 PM MDT	Severe Thunderstorm Warning	UNR	Crook	64 min
Aug 26, 5:10 PM MDT	Severe Thunderstorm Warning	UNR	Campbell, Crook	35 min
Aug 26, 5:22 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	Crook	53 min
Aug 26, 5:41 PM MDT	Severe Thunderstorm Warning	UNR	Campbell, Crook	64 min
Aug 26, 6:12 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	Crook	63 min
Oct 2, 5:42 PM MDT	Severe Thunderstorm Warning	UNR	Crook, Weston	34 min

By county

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

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record The radar archive 2021 2023

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.