Alert archive / Arizona / Flash Flood Warnings

Flash Flood Warnings in Arizona, 2023

164 flash flood warnings in 2023. 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 flash flood warnings reaches back to 1986.

Flash Flood Warnings by county

Each county as a circle sized by its count in 2023. Tap one for its archive.

Flash Flood Warnings: 164
Busiest month: August69 flash flood warnings
Busiest day: September 2, 202315 flash flood warnings

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

40 of 164 flash flood warnings covering Arizona in 2023 had a flash flood report inside them; 61 of 99 flash flood reports fell inside a warning, on average 101 minutes after it went out.

Arizona, 2023

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Flash flood warnings	164	40	76%	99	62%	101 min

Each office's whole area, 2023

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Las Vegas, NV: flash flood warnings	146	56	62%	184	68%	114 min
NWS Flagstaff, AZ: flash flood warnings	71	10	86%	30	40%	151 min
NWS Tucson, AZ: flash flood warnings	14	2	86%	2	100%	78 min
NWS Phoenix, AZ: flash flood warnings	47	21	55%	50	88%	96 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
Jan 1, 5:10 PM MST	Flash Flood Warning Considerable damage threat	PSR	Pinal	4 hr
Jan 1, 5:35 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa, Pinal	4 hr
Jan 1, 5:42 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	4 hr
Mar 15, 8:25 AM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Mar 15, 11:13 AM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	2 hr
Mar 15, 3:38 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	4 hr
Mar 15, 3:51 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Mar 15, 6:20 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Mar 15, 8:14 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Mar 23, 12:19 AM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	35 hr
May 16, 4:27 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	15 hr
May 19, 4:00 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	8 hr
May 19, 4:30 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	5 hr
May 19, 4:37 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
May 20, 2:53 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	9 hr
May 20, 4:08 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
May 20, 4:32 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
May 20, 5:30 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Jun 2, 6:03 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	117 min
Jun 11, 5:17 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Jul 12, 4:22 PM MST	Flash Flood Warning	FGZ	Gila, Navajo	3 hr
Jul 17, 5:16 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	2 hr
Jul 17, 7:28 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	3 hr
Jul 21, 4:18 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila, Yavapai	3 hr
Jul 24, 5:09 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Jul 25, 4:09 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	4 hr
Jul 27, 6:00 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	3 hr
Jul 28, 5:55 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 28, 6:00 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 28, 10:20 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa, Pinal	4 hr
Jul 29, 2:13 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Jul 29, 3:26 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	4 hr
Jul 30, 12:28 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Jul 30, 1:02 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Jul 30, 2:35 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	9 hr
Jul 30, 3:28 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Yavapai	3 hr
Jul 30, 3:48 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 30, 3:59 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Yavapai	3 hr
Jul 31, 1:50 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Jul 31, 4:33 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 31, 4:38 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	6 hr
Jul 31, 5:57 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Navajo	3 hr
Jul 31, 6:33 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	2 hr
Jul 31, 6:49 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Jul 31, 7:06 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	2 hr
Jul 31, 7:26 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Navajo	3 hr
Jul 31, 7:31 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Jul 31, 8:06 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 1, 3:12 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 2, 9:21 AM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	114 min
Aug 2, 10:15 AM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	4 hr
Aug 6, 5:40 PM MST	Flash Flood Warning	TWC	Cochise, Santa Cruz	3 hr
Aug 6, 7:26 PM MST	Flash Flood Warning	TWC	Santa Cruz	3 hr
Aug 7, 1:27 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	3 hr
Aug 7, 4:25 PM MST	Flash Flood Warning Considerable damage threat	TWC	Graham	3 hr
Aug 9, 6:00 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 10, 4:51 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 10, 5:29 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 11, 5:37 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Navajo	6 hr
Aug 11, 7:35 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	4 hr
Aug 12, 12:14 AM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	8 hr
Aug 12, 1:10 AM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	8 hr
Aug 12, 11:31 AM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	4 hr
Aug 12, 1:05 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Gila	3 hr
Aug 12, 1:26 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 13, 10:58 AM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 13, 11:02 AM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Aug 13, 12:17 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Aug 13, 12:44 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	2 hr
Aug 13, 1:12 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 13, 1:28 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Aug 13, 2:26 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 15, 1:02 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 15, 8:24 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 16, 1:43 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 16, 2:59 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 16, 4:52 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Aug 16, 6:09 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Navajo	3 hr
Aug 16, 6:59 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	3 hr
Aug 17, 11:37 AM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 17, 12:20 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Apache	3 hr
Aug 17, 2:33 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila, Maricopa	4 hr
Aug 17, 6:16 PM MST	Flash Flood Warning	PSR	Maricopa, Pinal	119 min
Aug 17, 9:15 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz, Yuma	3 hr
Aug 18, 12:59 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 18, 1:11 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 18, 2:51 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Aug 18, 4:42 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	2 hr
Aug 18, 5:40 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	5 hr
Aug 18, 6:14 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 18, 6:28 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 18, 7:23 PM MST	Flash Flood Warning Considerable damage threat	TWC	Santa Cruz	112 min
Aug 20, 3:06 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz, Yuma	3 hr
Aug 21, 6:17 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise, Pima, Santa Cruz	118 min
Aug 22, 4:09 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 22, 4:47 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	4 hr
Aug 23, 12:37 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 23, 2:03 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 23, 2:33 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 23, 2:35 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 23, 3:54 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	4 hr
Aug 23, 4:25 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 23, 5:54 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 24, 3:58 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	100 min
Aug 24, 4:26 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 24, 5:00 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	110 min
Aug 26, 12:38 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 30, 5:08 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Aug 30, 7:03 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Aug 31, 3:59 PM MST	Flash Flood Warning	VEF	Mohave	3 hr
Aug 31, 10:00 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	3 hr
Aug 31, 11:11 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	8 hr
Aug 31, 11:31 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	8 hr
Sep 1, 12:25 AM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	4 hr
Sep 1, 12:52 AM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	4 hr
Sep 1, 1:38 AM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	5 hr
Sep 1, 3:29 AM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	4 hr
Sep 1, 5:03 AM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Sep 1, 10:30 AM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	2 hr
Sep 1, 11:42 AM MST	Flash Flood Warning Considerable damage threat	PSR	Yuma	3 hr
Sep 1, 12:28 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz, Yuma	4 hr
Sep 1, 1:24 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz	6 hr
Sep 1, 4:04 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	4 hr
Sep 2, 12:16 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz	7 hr
Sep 2, 12:27 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Sep 2, 12:43 PM MST	Flash Flood Warning Considerable damage threat	PSR	Yuma	3 hr
Sep 2, 12:56 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Sep 2, 1:06 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	2 hr
Sep 2, 1:37 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	8 hr
Sep 2, 1:45 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	6 hr
Sep 2, 2:24 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz	4 hr
Sep 2, 2:34 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz	4 hr
Sep 2, 2:46 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz	4 hr
Sep 2, 2:51 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	5 hr
Sep 2, 3:08 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Sep 2, 3:27 PM MST	Flash Flood Warning Considerable damage threat	PSR	Yuma	5 hr
Sep 2, 3:46 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz, Yuma	3 hr
Sep 2, 4:36 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz, Maricopa	5 hr
Sep 2, 5:07 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Sep 2, 5:22 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Sep 2, 5:24 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Sep 12, 10:54 AM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Sep 12, 5:49 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila, Maricopa	4 hr
Sep 12, 6:07 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila	3 hr
Sep 12, 10:40 PM MST	Flash Flood Warning Considerable damage threat	PSR	Pinal	3 hr
Sep 13, 2:51 AM MST	Flash Flood Warning Considerable damage threat	PSR	Gila, Maricopa	6 hr
Sep 13, 6:08 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa, Pinal	3 hr
Sep 13, 7:44 AM MST	Flash Flood Warning Considerable damage threat	PSR	Gila, Maricopa	3 hr
Sep 13, 7:53 AM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	3 hr
Sep 13, 12:15 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Sep 13, 1:46 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Navajo	3 hr
Sep 13, 1:55 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Sep 13, 3:03 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	4 hr
Sep 13, 3:10 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Sep 13, 4:13 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	13 hr
Sep 13, 4:51 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Navajo	6 hr
Sep 13, 6:52 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Sep 13, 11:54 PM MST	Flash Flood Warning	VEF	Mohave	3 hr
Sep 14, 12:42 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Sep 14, 2:07 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila, Yavapai	3 hr
Dec 22, 3:33 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz, Yuma	3 hr
Dec 22, 3:44 PM MST	Flash Flood Warning Considerable damage threat	PSR	Yuma	3 hr
Dec 22, 5:08 PM MST	Flash Flood Warning Considerable damage threat	PSR	Yuma	3 hr
Dec 22, 6:24 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz, Yuma	4 hr

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 2022 2024

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.