Alert archive / Wyoming / Severe Thunderstorm Warnings

Severe Thunderstorm Warnings in Wyoming, 2024

192 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: 192
Busiest month: July57 severe thunderstorm warnings
Busiest day: June 10, 202413 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.

102 of 192 severe thunderstorm warnings covering Wyoming in 2024 had a qualifying storm report inside them; 151 of 264 hail, wind and damage reports fell inside a warning, on average 18 minutes after it went out.

Wyoming, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Severe thunderstorm warnings	192	102	47%	264	57%	18 min

Each office's whole area, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Salt Lake City, UT: severe thunderstorm warnings	100	37	63%	272	25%	16 min
NWS Cheyenne, WY: severe thunderstorm warnings	208	98	53%	201	82%	18 min
NWS Riverton, WY: severe thunderstorm warnings	28	8	71%	69	26%	15 min
NWS Billings, MT: severe thunderstorm warnings	89	31	65%	127	50%	23 min
NWS Rapid City, SD: severe thunderstorm warnings	299	221	26%	611	79%	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 25, 12:35 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara	26 min
Apr 25, 5:47 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	23 min
May 14, 6:59 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Albany, Carbon	46 min
May 14, 7:28 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Carbon	32 min
May 17, 3:57 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Carbon	48 min
May 17, 8:51 PM MDT	Severe Thunderstorm Warning	UNR	Campbell, Crook	54 min
May 17, 9:41 PM MDT	Severe Thunderstorm Warning	UNR	Crook	33 min
May 19, 2:44 PM MDT	Severe Thunderstorm Warning	UNR	Weston	61 min
May 20, 7:30 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	45 min
May 29, 1:40 PM MDT	Severe Thunderstorm Warning	UNR	Campbell, Crook	50 min
May 29, 2:29 PM MDT	Severe Thunderstorm Warning	UNR	Campbell, Crook	34 min
May 29, 2:36 PM MDT	Severe Thunderstorm Warning	UNR	Campbell, Crook, Weston	39 min
May 29, 4:17 PM MDT	Severe Thunderstorm Warning	UNR	Crook	18 min
May 29, 8:32 PM MDT	Severe Thunderstorm Warning	RIW	Sweetwater	28 min
Jun 1, 2:53 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	52 min
Jun 1, 3:50 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	40 min
Jun 1, 4:24 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	51 min
Jun 2, 1:26 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	49 min
Jun 2, 2:20 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	40 min
Jun 2, 2:29 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	46 min
Jun 8, 1:07 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	38 min
Jun 8, 1:46 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Laramie	59 min
Jun 8, 1:59 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	31 min
Jun 8, 4:33 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	27 min
Jun 9, 8:20 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Carbon	40 min
Jun 9, 8:54 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Albany, Carbon	40 min
Jun 10, 12:25 PM MDT	Severe Thunderstorm Warning	UNR	Crook	50 min
Jun 10, 1:12 PM MDT	Severe Thunderstorm Warning	UNR	Crook	63 min
Jun 10, 1:19 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	41 min
Jun 10, 2:01 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	44 min
Jun 10, 2:03 PM MDT	Severe Thunderstorm Warning	UNR	Crook, Weston	52 min
Jun 10, 2:20 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	40 min
Jun 10, 2:39 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	51 min
Jun 10, 2:49 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	41 min
Jun 10, 2:50 PM MDT	Severe Thunderstorm Warning	UNR	Weston	40 min
Jun 10, 3:35 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	40 min
Jun 10, 4:48 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Albany, Carbon	42 min
Jun 10, 6:10 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	20 min
Jun 10, 6:19 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	41 min
Jun 14, 6:15 PM MDT	Severe Thunderstorm Warning	BYZ	Sheridan	45 min
Jun 17, 6:58 PM MDT	Severe Thunderstorm Warning	UNR	Crook	62 min
Jun 20, 1:50 PM MDT	Severe Thunderstorm Warning	CYS	Platte	40 min
Jun 20, 2:26 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Goshen, Platte	38 min
Jun 20, 2:28 PM MDT	Severe Thunderstorm Warning	CYS	Platte	32 min
Jun 20, 2:47 PM MDT	Severe Thunderstorm Warning Destructive damage threat	CYS	Goshen	43 min
Jun 20, 3:16 PM MDT	Severe Thunderstorm Warning Destructive damage threat	CYS	Goshen	30 min
Jun 20, 4:20 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	40 min
Jun 21, 1:35 PM MDT	Severe Thunderstorm Warning	CYS	Converse	40 min
Jun 21, 2:08 PM MDT	Severe Thunderstorm Warning	RIW	Hot Springs, Washakie	52 min
Jun 21, 2:22 PM MDT	Severe Thunderstorm Warning	CYS	Laramie, Platte	23 min
Jun 21, 2:44 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Goshen, Laramie, Platte	31 min
Jun 21, 2:58 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	32 min
Jun 21, 3:29 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	46 min
Jun 21, 4:05 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara	40 min
Jun 21, 8:09 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	51 min
Jun 26, 6:04 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	41 min
Jun 27, 3:54 PM MDT	Severe Thunderstorm Warning	BYZ	Sheridan	54 min
Jun 27, 4:15 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	45 min
Jun 27, 4:43 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	47 min
Jun 27, 5:10 PM MDT	Severe Thunderstorm Warning	UNR	Campbell, Crook, Weston	65 min
Jun 27, 5:24 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	51 min
Jun 27, 5:57 PM MDT	Severe Thunderstorm Warning	UNR	Crook	63 min
Jun 30, 2:42 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie, Platte	37 min
Jun 30, 3:17 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	28 min
Jun 30, 5:09 PM MDT	Severe Thunderstorm Warning	UNR	Weston	51 min
Jun 30, 5:40 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	20 min
Jun 30, 5:58 PM MDT	Severe Thunderstorm Warning	UNR	Weston	47 min
Jun 30, 6:35 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	Weston	55 min
Jun 30, 7:54 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	51 min
Jun 30, 8:37 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Laramie	38 min
Jul 1, 3:51 AM MDT	Severe Thunderstorm Warning	CYS	Albany, Carbon	24 min
Jul 1, 2:17 PM MDT	Severe Thunderstorm Warning	RIW	Hot Springs, Park, Washakie	43 min
Jul 1, 3:00 PM MDT	Severe Thunderstorm Warning	RIW	Hot Springs, Washakie	45 min
Jul 1, 3:41 PM MDT	Severe Thunderstorm Warning	RIW	Hot Springs, Washakie	49 min
Jul 1, 4:25 PM MDT	Severe Thunderstorm Warning	RIW	Johnson, Washakie	35 min
Jul 1, 5:26 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	49 min
Jul 1, 6:21 PM MDT	Severe Thunderstorm Warning	CYS	Converse	39 min
Jul 1, 6:56 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara	64 min
Jul 3, 2:42 PM MDT	Severe Thunderstorm Warning	UNR	Crook, Weston	63 min
Jul 3, 3:03 PM MDT	Severe Thunderstorm Warning	UNR	Weston	42 min
Jul 3, 4:55 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Sheridan	46 min
Jul 6, 4:18 PM MDT	Severe Thunderstorm Warning	UNR	Campbell	57 min
Jul 12, 6:30 PM MDT	Severe Thunderstorm Warning	UNR	Crook	45 min
Jul 12, 6:49 PM MDT	Severe Thunderstorm Warning	UNR	Crook, Weston	26 min
Jul 13, 8:48 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	Crook	57 min
Jul 15, 2:24 PM MDT	Severe Thunderstorm Warning	RIW	Fremont	51 min
Jul 15, 2:43 PM MDT	Severe Thunderstorm Warning Considerable damage threat	RIW	Fremont	47 min
Jul 15, 3:32 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	26 min
Jul 15, 4:38 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	37 min
Jul 15, 5:04 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Converse	22 min
Jul 15, 6:42 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Laramie	33 min
Jul 15, 7:03 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Goshen, Laramie, Platte	33 min
Jul 17, 12:05 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	13 min
Jul 17, 12:30 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara	30 min
Jul 17, 1:02 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	43 min
Jul 17, 2:33 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	27 min
Jul 17, 2:39 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	36 min
Jul 17, 2:58 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	47 min
Jul 18, 5:05 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie, Platte	25 min
Jul 18, 6:10 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	35 min
Jul 19, 5:55 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie, Platte	50 min
Jul 19, 6:29 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	31 min
Jul 20, 1:08 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Niobrara	37 min
Jul 20, 1:45 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara	30 min
Jul 20, 3:23 PM MDT	Severe Thunderstorm Warning	RIW	Fremont	22 min
Jul 20, 3:27 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	33 min
Jul 20, 3:59 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	46 min
Jul 20, 4:45 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	45 min
Jul 20, 5:27 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	48 min
Jul 21, 1:52 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	23 min
Jul 26, 4:15 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	18 min
Jul 27, 3:52 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Carbon	53 min
Jul 27, 5:05 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie, Platte	30 min
Jul 27, 5:23 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Converse, Goshen, Niobrara, Platte	52 min
Jul 27, 5:33 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	42 min
Jul 27, 5:47 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara, Platte	43 min
Jul 27, 5:58 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Goshen, Niobrara, Platte	47 min
Jul 27, 7:16 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Albany, Carbon	44 min
Jul 27, 8:00 PM MDT	Severe Thunderstorm Warning	SLC	Uinta	30 min
Jul 28, 2:55 PM MDT	Severe Thunderstorm Warning	UNR	Crook	65 min
Jul 28, 3:48 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Carbon	72 min
Jul 28, 4:17 PM MDT	Severe Thunderstorm Warning	UNR	Campbell	73 min
Jul 28, 4:24 PM MDT	Severe Thunderstorm Warning	UNR	Crook	42 min
Jul 28, 4:39 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	Campbell, Weston	65 min
Aug 2, 3:33 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie, Platte	34 min
Aug 6, 4:55 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	35 min
Aug 6, 5:10 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	20 min
Aug 6, 5:38 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	Campbell, Crook	52 min
Aug 6, 6:02 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	Campbell	58 min
Aug 6, 6:36 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	39 min
Aug 6, 6:52 PM MDT	Severe Thunderstorm Warning	UNR	Campbell, Weston	37 min
Aug 7, 3:34 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	41 min
Aug 7, 4:21 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	39 min
Aug 7, 5:47 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	27 min
Aug 7, 11:47 PM MDT	Severe Thunderstorm Warning	CYS	Albany	43 min
Aug 8, 12:19 AM MDT	Severe Thunderstorm Warning	CYS	Albany	41 min
Aug 8, 1:26 AM MDT	Severe Thunderstorm Warning	CYS	Albany	34 min
Aug 9, 3:27 PM MDT	Severe Thunderstorm Warning	RIW	Hot Springs	33 min
Aug 10, 1:07 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Albany, Laramie	38 min
Aug 10, 1:19 PM MDT	Severe Thunderstorm Warning	RIW	Sweetwater	26 min
Aug 10, 1:31 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	44 min
Aug 10, 1:47 PM MDT	Severe Thunderstorm Warning	RIW	Lincoln, Teton	28 min
Aug 10, 2:09 PM MDT	Severe Thunderstorm Warning	RIW	Lincoln, Sublette, Teton	25 min
Aug 12, 1:12 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	33 min
Aug 12, 2:22 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	23 min
Aug 12, 2:43 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	32 min
Aug 12, 3:08 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	37 min
Aug 12, 3:38 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Laramie	37 min
Aug 12, 4:16 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Laramie	29 min
Aug 17, 1:51 PM MDT	Severe Thunderstorm Warning	SLC	Uinta	39 min
Aug 17, 2:18 PM MDT	Severe Thunderstorm Warning	SLC	Uinta	42 min
Aug 17, 4:14 PM MDT	Severe Thunderstorm Warning Considerable damage threat	RIW	Fremont, Sublette	31 min
Aug 17, 5:12 PM MDT	Severe Thunderstorm Warning	RIW	Fremont, Sweetwater	33 min
Aug 17, 5:23 PM MDT	Severe Thunderstorm Warning	RIW	Fremont	22 min
Aug 17, 5:26 PM MDT	Severe Thunderstorm Warning	CYS	Carbon	49 min
Aug 17, 5:43 PM MDT	Severe Thunderstorm Warning	RIW	Fremont	32 min
Aug 17, 5:58 PM MDT	Severe Thunderstorm Warning	CYS	Carbon	47 min
Aug 19, 3:50 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	40 min
Aug 19, 4:10 PM MDT	Severe Thunderstorm Warning	BYZ	Sheridan	35 min
Aug 19, 5:25 PM MDT	Severe Thunderstorm Warning	UNR	Crook	65 min
Aug 19, 6:12 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	Crook	48 min
Aug 19, 6:54 PM MDT	Severe Thunderstorm Warning	UNR	Crook	66 min
Aug 19, 8:07 PM MDT	Severe Thunderstorm Warning	RIW	Johnson, Natrona	23 min
Aug 21, 4:09 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	Campbell	35 min
Aug 25, 6:19 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Carbon	41 min
Aug 25, 6:56 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Carbon	38 min
Aug 26, 8:13 AM MDT	Severe Thunderstorm Warning	RIW	Fremont	47 min
Aug 26, 8:43 AM MDT	Severe Thunderstorm Warning	RIW	Fremont	47 min
Aug 26, 1:42 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	Campbell, Crook, Weston	48 min
Aug 26, 1:45 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	Weston	45 min
Aug 26, 2:05 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	Crook	40 min
Aug 26, 2:28 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	Weston	47 min
Aug 26, 2:41 PM MDT	Severe Thunderstorm Warning	UNR	Crook	49 min
Sep 4, 2:18 PM MDT	Severe Thunderstorm Warning	CYS	Platte	42 min
Sep 12, 11:35 AM MDT	Severe Thunderstorm Warning	BYZ	Sheridan	25 min
Sep 12, 3:00 PM MDT	Severe Thunderstorm Warning	BYZ	Sheridan	45 min
Sep 12, 3:17 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Sheridan	28 min
Sep 12, 4:13 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	Sheridan	32 min
Sep 15, 3:39 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie, Platte	36 min
Sep 15, 4:13 PM MDT	Severe Thunderstorm Warning	CYS	Platte	32 min
Sep 15, 4:15 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	30 min
Sep 15, 4:41 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	34 min
Sep 15, 4:45 PM MDT	Severe Thunderstorm Warning	CYS	Platte	30 min
Sep 15, 4:46 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	29 min
Sep 15, 5:14 PM MDT	Severe Thunderstorm Warning	RIW	Fremont	31 min
Sep 15, 5:15 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	30 min
Sep 15, 5:45 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	45 min
Sep 15, 6:29 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	36 min
Sep 15, 6:30 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	45 min
Sep 15, 7:08 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	37 min
Sep 15, 8:15 PM MDT	Severe Thunderstorm Warning	UNR	Weston	32 min
Sep 17, 4:47 PM MDT	Severe Thunderstorm Warning	UNR	Crook, Weston	58 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 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.