Alert archive / Arizona / Severe Thunderstorm Warnings

Severe Thunderstorm Warnings in Arizona, 2017

232 severe thunderstorm warnings in 2017. 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 2017. Tap one for its archive.

Severe Thunderstorm Warnings: 232
Busiest month: July141 severe thunderstorm warnings
Busiest day: July 14, 201718 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.

52 of 232 severe thunderstorm warnings covering Arizona in 2017 had a qualifying storm report inside them; 79 of 176 hail, wind and damage reports fell inside a warning, on average 19 minutes after it went out.

Arizona, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Severe thunderstorm warnings	232	52	78%	176	45%	19 min

Each office's whole area, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Las Vegas, NV: severe thunderstorm warnings	55	13	76%	75	49%	21 min
NWS Tucson, AZ: severe thunderstorm warnings	81	10	88%	31	35%	17 min
NWS Phoenix, AZ: severe thunderstorm warnings	79	28	65%	92	49%	17 min
NWS Flagstaff, AZ: severe thunderstorm warnings	48	7	85%	23	30%	13 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 3, 3:40 PM MST	Severe Thunderstorm Warning	VEF	Mohave	50 min
Jun 20, 5:38 PM MST	Severe Thunderstorm Warning	TWC	Graham, Greenlee	37 min
Jul 2, 3:24 PM MST	Severe Thunderstorm Warning	TWC	Santa Cruz	36 min
Jul 8, 11:57 AM MST	Severe Thunderstorm Warning	FGZ	Apache	31 min
Jul 8, 4:27 PM MST	Severe Thunderstorm Warning	TWC	Pima	48 min
Jul 8, 5:04 PM MST	Severe Thunderstorm Warning	TWC	Pima	41 min
Jul 8, 5:46 PM MST	Severe Thunderstorm Warning	TWC	Pima	44 min
Jul 8, 7:36 PM MST	Severe Thunderstorm Warning	VEF	Mohave	54 min
Jul 8, 8:30 PM MST	Severe Thunderstorm Warning	PSR	La Paz	30 min
Jul 8, 8:57 PM MST	Severe Thunderstorm Warning	PSR	La Paz	18 min
Jul 9, 12:18 PM MST	Severe Thunderstorm Warning	TWC	Pima, Santa Cruz	42 min
Jul 9, 12:56 PM MST	Severe Thunderstorm Warning	TWC	Pima, Santa Cruz	49 min
Jul 9, 1:13 PM MST	Severe Thunderstorm Warning	TWC	Cochise	25 min
Jul 9, 1:41 PM MST	Severe Thunderstorm Warning	TWC	Santa Cruz	49 min
Jul 9, 1:42 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima, Santa Cruz	48 min
Jul 9, 4:20 PM MST	Severe Thunderstorm Warning	TWC	Pinal	40 min
Jul 9, 5:27 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	33 min
Jul 9, 5:32 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	43 min
Jul 9, 6:13 PM MST	Severe Thunderstorm Warning	TWC	Pima	47 min
Jul 10, 1:42 PM MST	Severe Thunderstorm Warning	VEF	Mohave	19 min
Jul 10, 7:09 PM MST	Severe Thunderstorm Warning	TWC	Pima	51 min
Jul 10, 7:24 PM MST	Severe Thunderstorm Warning	TWC	Pima	36 min
Jul 11, 4:08 PM MST	Severe Thunderstorm Warning	VEF	Mohave	52 min
Jul 11, 6:58 PM MST	Severe Thunderstorm Warning	PSR	La Paz	32 min
Jul 12, 2:10 PM MST	Severe Thunderstorm Warning	TWC	Santa Cruz	35 min
Jul 12, 4:21 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa	24 min
Jul 12, 4:43 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa	32 min
Jul 12, 5:31 PM MST	Severe Thunderstorm Warning	TWC	Graham, Pinal	44 min
Jul 12, 5:40 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	35 min
Jul 12, 5:54 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa	36 min
Jul 13, 1:55 PM MST	Severe Thunderstorm Warning	VEF	Mohave	41 min
Jul 13, 3:35 PM MST	Severe Thunderstorm Warning	FGZ	Gila	25 min
Jul 13, 4:16 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima, Santa Cruz	17 min
Jul 13, 4:30 PM MST	Severe Thunderstorm Warning	PSR	Gila	30 min
Jul 13, 4:38 PM MST	Severe Thunderstorm Warning	PSR	Gila	37 min
Jul 13, 4:42 PM MST	Severe Thunderstorm Warning	TWC	Graham, Pinal	48 min
Jul 13, 4:44 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima	46 min
Jul 13, 4:56 PM MST	Severe Thunderstorm Warning	TWC	Cochise	49 min
Jul 13, 5:13 PM MST	Severe Thunderstorm Warning	TWC	Cochise	47 min
Jul 13, 5:25 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima	50 min
Jul 13, 5:32 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	28 min
Jul 13, 5:43 PM MST	Severe Thunderstorm Warning	TWC	Cochise	62 min
Jul 13, 6:00 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima	45 min
Jul 13, 6:43 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima, Santa Cruz	62 min
Jul 13, 6:47 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Santa Cruz	33 min
Jul 13, 7:10 PM MST	Severe Thunderstorm Warning	TWC	Pima	80 min
Jul 13, 8:08 PM MST	Severe Thunderstorm Warning	TWC	Pima	37 min
Jul 13, 8:32 PM MST	Severe Thunderstorm Warning	TWC	Pima, Santa Cruz	43 min
Jul 13, 9:12 PM MST	Severe Thunderstorm Warning	TWC	Pima, Santa Cruz	48 min
Jul 14, 2:21 PM MST	Severe Thunderstorm Warning	FGZ	Gila	24 min
Jul 14, 3:48 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa	27 min
Jul 14, 4:09 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa, Pinal	36 min
Jul 14, 4:23 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	37 min
Jul 14, 4:24 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	51 min
Jul 14, 4:44 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	31 min
Jul 14, 4:55 PM MST	Severe Thunderstorm Warning	TWC	Pinal	35 min
Jul 14, 6:11 PM MST	Severe Thunderstorm Warning	TWC	Pinal	49 min
Jul 14, 6:29 PM MST	Severe Thunderstorm Warning	PSR	Pinal	31 min
Jul 14, 6:32 PM MST	Severe Thunderstorm Warning	TWC	Pinal	43 min
Jul 14, 8:29 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Yuma	31 min
Jul 15, 1:04 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Navajo	41 min
Jul 15, 2:23 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Yavapai	52 min
Jul 15, 2:49 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	41 min
Jul 15, 3:02 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Yavapai	43 min
Jul 15, 3:29 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	27 min
Jul 15, 3:46 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	44 min
Jul 15, 3:49 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa	26 min
Jul 15, 4:30 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	45 min
Jul 15, 4:37 PM MST	Severe Thunderstorm Warning	TWC	Santa Cruz	38 min
Jul 15, 5:04 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	56 min
Jul 15, 5:31 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	29 min
Jul 15, 5:34 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	26 min
Jul 15, 5:55 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	35 min
Jul 15, 8:05 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	25 min
Jul 16, 2:27 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	31 min
Jul 16, 2:54 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	24 min
Jul 16, 3:13 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	16 min
Jul 16, 3:20 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	28 min
Jul 16, 3:58 PM MST	Severe Thunderstorm Warning	TWC	Pima	47 min
Jul 16, 5:41 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	34 min
Jul 16, 5:48 PM MST	Severe Thunderstorm Warning	PSR	Pinal	57 min
Jul 16, 5:51 PM MST	Severe Thunderstorm Warning	VEF	Mohave	24 min
Jul 16, 6:00 PM MST	Severe Thunderstorm Warning	TWC	Pinal	60 min
Jul 16, 7:52 PM MST	Severe Thunderstorm Warning	PSR	Pinal	38 min
Jul 16, 8:41 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Yavapai	34 min
Jul 16, 9:12 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa	33 min
Jul 16, 9:35 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	25 min
Jul 16, 10:06 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	24 min
Jul 16, 10:20 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	25 min
Jul 16, 10:46 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	29 min
Jul 17, 2:12 PM MST	Severe Thunderstorm Warning	TWC	Pinal	33 min
Jul 17, 2:25 PM MST	Severe Thunderstorm Warning	VEF	Mohave	65 min
Jul 17, 3:09 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	51 min
Jul 17, 3:20 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	40 min
Jul 17, 3:40 PM MST	Severe Thunderstorm Warning	TWC	Graham	23 min
Jul 17, 4:02 PM MST	Severe Thunderstorm Warning	TWC	Graham, Pinal	28 min
Jul 17, 7:19 PM MST	Severe Thunderstorm Warning	VEF	Mohave	56 min
Jul 17, 7:35 PM MST	Severe Thunderstorm Warning	PSR	La Paz	55 min
Jul 17, 8:09 PM MST	Severe Thunderstorm Warning	VEF	Mohave	35 min
Jul 17, 10:37 PM MST	Severe Thunderstorm Warning	PSR	Gila	23 min
Jul 18, 12:44 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Navajo	31 min
Jul 18, 2:17 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Gila	28 min
Jul 18, 2:33 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	27 min
Jul 18, 2:58 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	15 min
Jul 18, 3:05 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	3 min
Jul 18, 3:06 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa	24 min
Jul 18, 3:21 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	15 min
Jul 18, 4:25 PM MST	Severe Thunderstorm Warning	VEF	Mohave	50 min
Jul 18, 5:14 PM MST	Severe Thunderstorm Warning	VEF	Mohave	35 min
Jul 18, 5:15 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	18 min
Jul 18, 6:06 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	24 min
Jul 19, 1:41 PM MST	Severe Thunderstorm Warning	TWC	Pinal	64 min
Jul 19, 3:28 PM MST	Severe Thunderstorm Warning	TWC	Pima	47 min
Jul 19, 4:40 PM MST	Severe Thunderstorm Warning	TWC	Pinal	33 min
Jul 19, 5:13 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	32 min
Jul 21, 1:22 PM MST	Severe Thunderstorm Warning	TWC	Cochise	38 min
Jul 21, 3:02 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	28 min
Jul 21, 3:07 PM MST	Severe Thunderstorm Warning	PSR	Gila	23 min
Jul 22, 2:44 PM MST	Severe Thunderstorm Warning	TWC	Graham, Greenlee	46 min
Jul 22, 2:56 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	23 min
Jul 22, 4:53 PM MST	Severe Thunderstorm Warning	TWC	Cochise	37 min
Jul 22, 5:30 PM MST	Severe Thunderstorm Warning	TWC	Pima	18 min
Jul 23, 2:56 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	49 min
Jul 23, 3:01 PM MST	Severe Thunderstorm Warning	TWC	Pima	29 min
Jul 23, 3:10 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	50 min
Jul 23, 3:33 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	27 min
Jul 23, 3:55 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Yavapai	25 min
Jul 23, 4:08 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Yavapai	37 min
Jul 23, 4:18 PM MST	Severe Thunderstorm Warning	TWC	Graham	42 min
Jul 23, 4:23 PM MST	Severe Thunderstorm Warning	PSR	Gila	22 min
Jul 23, 4:27 PM MST	Severe Thunderstorm Warning	TWC	Pinal	34 min
Jul 23, 5:16 PM MST	Severe Thunderstorm Warning	TWC	Graham	28 min
Jul 23, 5:53 PM MST	Severe Thunderstorm Warning	TWC	Graham, Pinal	42 min
Jul 27, 5:10 PM MST	Severe Thunderstorm Warning	TWC	Cochise	35 min
Jul 28, 3:16 PM MST	Severe Thunderstorm Warning	TWC	Pima	29 min
Jul 28, 3:39 PM MST	Severe Thunderstorm Warning	TWC	Pima	51 min
Jul 28, 3:52 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	23 min
Jul 28, 4:04 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	22 min
Jul 28, 4:24 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	12 min
Jul 28, 5:55 PM MST	Severe Thunderstorm Warning	TWC	Cochise	35 min
Jul 29, 8:14 PM MST	Severe Thunderstorm Warning	TWC	Graham	31 min
Jul 31, 3:44 PM MST	Severe Thunderstorm Warning	TWC	Pima	31 min
Jul 31, 4:00 PM MST	Severe Thunderstorm Warning	TWC	Santa Cruz	30 min
Jul 31, 9:05 PM MST	Severe Thunderstorm Warning	TWC	Pima	40 min
Aug 1, 4:48 PM MST	Severe Thunderstorm Warning	PSR	Pinal	27 min
Aug 1, 5:30 PM MST	Severe Thunderstorm Warning	VEF	Mohave	75 min
Aug 1, 5:45 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	30 min
Aug 1, 6:09 PM MST	Severe Thunderstorm Warning	VEF	Mohave	51 min
Aug 2, 1:58 PM MST	Severe Thunderstorm Warning	TWC	Pima	32 min
Aug 2, 3:59 PM MST	Severe Thunderstorm Warning	TWC	Pima	46 min
Aug 2, 4:38 PM MST	Severe Thunderstorm Warning	VEF	Mohave	37 min
Aug 2, 5:14 PM MST	Severe Thunderstorm Warning	VEF	Mohave	61 min
Aug 2, 5:33 PM MST	Severe Thunderstorm Warning	PSR	Yuma	42 min
Aug 2, 6:02 PM MST	Severe Thunderstorm Warning	VEF	Mohave	28 min
Aug 2, 6:31 PM MST	Severe Thunderstorm Warning	VEF	Mohave	44 min
Aug 3, 2:41 PM MST	Severe Thunderstorm Warning	PSR	La Paz	34 min
Aug 3, 2:42 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	33 min
Aug 3, 3:20 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	25 min
Aug 3, 3:49 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	26 min
Aug 3, 3:51 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	24 min
Aug 3, 4:12 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	33 min
Aug 3, 4:15 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	30 min
Aug 3, 4:18 PM MST	Severe Thunderstorm Warning	PSR	Yuma	27 min
Aug 3, 4:36 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	24 min
Aug 3, 4:46 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	29 min
Aug 3, 4:56 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	34 min
Aug 3, 4:58 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	32 min
Aug 3, 5:02 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	28 min
Aug 3, 5:06 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	24 min
Aug 3, 5:27 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	48 min
Aug 9, 2:53 PM MST	Severe Thunderstorm Warning	TWC	Santa Cruz	37 min
Aug 10, 1:35 PM MST	Severe Thunderstorm Warning	PSR	La Paz	25 min
Aug 10, 2:24 PM MST	Severe Thunderstorm Warning	TWC	Santa Cruz	51 min
Aug 10, 2:56 PM MST	Severe Thunderstorm Warning	PSR	La Paz	34 min
Aug 10, 3:29 PM MST	Severe Thunderstorm Warning	PSR	La Paz	31 min
Aug 10, 4:02 PM MST	Severe Thunderstorm Warning	TWC	Pima	43 min
Aug 10, 5:04 PM MST	Severe Thunderstorm Warning	TWC	Pima	41 min
Aug 10, 5:54 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Graham	39 min
Aug 12, 1:18 PM MST	Severe Thunderstorm Warning	TWC	Cochise	42 min
Aug 12, 1:50 PM MST	Severe Thunderstorm Warning	VEF	Mohave	40 min
Aug 12, 2:27 PM MST	Severe Thunderstorm Warning	VEF	Mohave	48 min
Aug 12, 4:38 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Gila	26 min
Aug 12, 5:55 PM MST	Severe Thunderstorm Warning	TWC	Cochise	35 min
Aug 12, 6:50 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima	40 min
Aug 12, 9:55 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	50 min
Aug 12, 10:26 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	49 min
Aug 13, 2:15 PM MST	Severe Thunderstorm Warning	TWC	Pima	30 min
Aug 13, 2:48 PM MST	Severe Thunderstorm Warning	VEF	Mohave	29 min
Aug 13, 6:18 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	18 min
Aug 14, 1:03 AM MST	Severe Thunderstorm Warning	PSR	Maricopa	42 min
Aug 14, 2:16 PM MST	Severe Thunderstorm Warning	FGZ	Apache, Navajo	29 min
Aug 14, 4:30 PM MST	Severe Thunderstorm Warning	FGZ	Apache, Navajo	30 min
Aug 23, 3:21 PM MST	Severe Thunderstorm Warning	TWC	Pima	39 min
Aug 23, 3:37 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	38 min
Aug 23, 3:51 PM MST	Severe Thunderstorm Warning	TWC	Pinal	39 min
Aug 23, 4:02 PM MST	Severe Thunderstorm Warning	TWC	Pima	43 min
Aug 23, 4:29 PM MST	Severe Thunderstorm Warning	TWC	Pinal	46 min
Aug 27, 5:13 PM MST	Severe Thunderstorm Warning	PSR	Pinal	32 min
Aug 27, 5:44 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	31 min
Aug 29, 4:49 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Navajo	41 min
Sep 2, 6:18 PM MST	Severe Thunderstorm Warning	VEF	Mohave	42 min
Sep 2, 6:58 PM MST	Severe Thunderstorm Warning	VEF	Mohave	47 min
Sep 3, 2:42 PM MST	Severe Thunderstorm Warning	VEF	Mohave	24 min
Sep 4, 2:56 PM MST	Severe Thunderstorm Warning	VEF	Mohave	28 min
Sep 4, 6:16 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	29 min
Sep 4, 6:28 PM MST	Severe Thunderstorm Warning	VEF	Mohave	62 min
Sep 5, 6:02 PM MST	Severe Thunderstorm Warning	VEF	Mohave	88 min
Sep 5, 6:45 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	30 min
Sep 5, 7:04 PM MST	Severe Thunderstorm Warning	VEF	Mohave	41 min
Sep 5, 7:12 PM MST	Severe Thunderstorm Warning	VEF	Mohave	63 min
Sep 5, 7:26 PM MST	Severe Thunderstorm Warning	VEF	Mohave	49 min
Sep 6, 5:08 PM MST	Severe Thunderstorm Warning	PSR	La Paz	52 min
Sep 6, 6:02 PM MST	Severe Thunderstorm Warning	PSR	La Paz	38 min
Sep 7, 3:17 PM MST	Severe Thunderstorm Warning	TWC	Pima	28 min
Sep 7, 4:42 PM MST	Severe Thunderstorm Warning	PSR	La Paz	63 min
Sep 7, 6:27 PM MST	Severe Thunderstorm Warning	PSR	Yuma	48 min
Sep 7, 7:52 PM MST	Severe Thunderstorm Warning	PSR	Yuma	38 min
Sep 7, 8:06 PM MST	Severe Thunderstorm Warning	PSR	La Paz, Yuma	54 min
Sep 7, 8:21 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	24 min
Sep 8, 4:07 PM MST	Severe Thunderstorm Warning	PSR	Yuma	23 min
Sep 8, 5:12 PM MST	Severe Thunderstorm Warning	PSR	La Paz	48 min
Sep 8, 5:39 PM MST	Severe Thunderstorm Warning	VEF	Mohave	51 min
Sep 8, 5:44 PM MST	Severe Thunderstorm Warning	VEF	Mohave	46 min
Sep 8, 8:00 PM MST	Severe Thunderstorm Warning	PSR	La Paz	45 min
Sep 10, 5:23 PM MST	Severe Thunderstorm Warning	VEF	Mohave	52 min
Sep 13, 12:27 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	33 min
Sep 14, 5:45 AM MST	Severe Thunderstorm Warning	FGZ	Apache	30 min
Sep 14, 10:53 AM MST	Severe Thunderstorm Warning	VEF	Mohave	37 min
Sep 14, 11:53 AM MST	Severe Thunderstorm Warning	FGZ	Coconino	20 min
Sep 29, 12:20 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	25 min
Sep 29, 5:25 PM MST	Severe Thunderstorm Warning	TWC	Cochise	39 min
Oct 4, 3:42 PM MST	Severe Thunderstorm Warning	TWC	Greenlee	33 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 2016 2018

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.