Alert archive / Arizona / Pima County / Flash Flood Warnings

Flash Flood Warnings in Pima County, Arizona, 2022

103 flash flood warnings in 2022. An alert counts here when it covered this county. The archive of flash flood warnings reaches back to 1986.

Pima County and its neighbors

Each county as a circle sized by its count in 2022. Tap one for its archive.

Flash Flood Warnings: 103
Busiest month: August46 flash flood warnings
Busiest day: August 19, 20229 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.

25 of 103 flash flood warnings covering Pima County in 2022 had a flash flood report inside them; 33 of 60 flash flood reports fell inside a warning, on average 75 minutes after it went out.

Pima County, 2022

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Flash flood warnings	103	25	76%	60	55%	75 min

Each office's whole area, 2022

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Tucson, AZ: flash flood warnings	165	31	81%	75	56%	73 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	Lasted
Jun 23, 12:12 PM MST	Flash Flood Warning Considerable damage threat	TWC	4 hr
Jun 23, 2:45 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Jun 24, 4:14 PM MST	Flash Flood Warning Considerable damage threat	TWC	2 hr
Jun 24, 4:49 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Jun 26, 12:42 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Jun 26, 6:25 PM MST	Flash Flood Warning Considerable damage threat	TWC	111 min
Jun 28, 12:09 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Jun 29, 11:08 AM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Jun 29, 3:09 PM MST	Flash Flood Warning Considerable damage threat	TWC	2 hr
Jun 30, 8:28 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Jun 30, 8:36 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Jul 1, 12:51 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Jul 1, 3:16 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Jul 1, 3:41 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Jul 13, 3:06 PM MST	Flash Flood Warning Considerable damage threat	TWC	114 min
Jul 16, 5:34 PM MST	Flash Flood Warning Considerable damage threat	TWC	2 hr
Jul 17, 5:19 PM MST	Flash Flood Warning Considerable damage threat	TWC	2 hr
Jul 17, 7:02 PM MST	Flash Flood Warning Considerable damage threat	TWC	2 hr
Jul 24, 1:13 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Jul 24, 2:19 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Jul 24, 3:00 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Jul 24, 4:31 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Jul 24, 4:45 PM MST	Flash Flood Warning Considerable damage threat	TWC	2 hr
Jul 26, 3:23 PM MST	Flash Flood Warning Considerable damage threat	TWC	2 hr
Jul 28, 11:03 AM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Jul 28, 11:25 AM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Jul 28, 11:59 AM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Jul 28, 12:47 PM MST	Flash Flood Warning Considerable damage threat	TWC	5 hr
Jul 30, 2:14 PM MST	Flash Flood Warning Considerable damage threat	TWC	2 hr
Jul 30, 4:31 PM MST	Flash Flood Warning Considerable damage threat	TWC	119 min
Jul 31, 12:31 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Jul 31, 5:50 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Jul 31, 7:07 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Aug 2, 12:18 PM MST	Flash Flood Warning Considerable damage threat	TWC	117 min
Aug 8, 10:58 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Aug 9, 2:57 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Aug 9, 3:45 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Aug 10, 7:40 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Aug 10, 7:54 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Aug 12, 11:38 AM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Aug 12, 11:56 AM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Aug 12, 12:39 PM MST	Flash Flood Warning Considerable damage threat	TWC	2 hr
Aug 12, 1:49 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Aug 12, 3:19 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Aug 13, 3:08 PM MST	Flash Flood Warning Considerable damage threat	TWC	112 min
Aug 13, 3:51 PM MST	Flash Flood Warning Considerable damage threat	TWC	114 min
Aug 13, 4:08 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Aug 13, 4:26 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Aug 13, 5:23 PM MST	Flash Flood Warning Considerable damage threat	TWC	112 min
Aug 13, 7:06 PM MST	Flash Flood Warning Considerable damage threat	TWC	4 hr
Aug 17, 3:03 PM MST	Flash Flood Warning Considerable damage threat	TWC	117 min
Aug 17, 6:32 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Aug 17, 9:08 PM MST	Flash Flood Warning Considerable damage threat	TWC	7 hr
Aug 19, 10:36 AM MST	Flash Flood Warning Considerable damage threat	TWC	114 min
Aug 19, 12:09 PM MST	Flash Flood Warning Considerable damage threat	TWC	81 min
Aug 19, 12:32 PM MST	Flash Flood Warning Considerable damage threat	TWC	118 min
Aug 19, 12:51 PM MST	Flash Flood Warning Considerable damage threat	TWC	114 min
Aug 19, 1:51 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Aug 19, 3:24 PM MST	Flash Flood Warning Considerable damage threat	TWC	111 min
Aug 19, 3:44 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Aug 19, 4:29 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Aug 19, 4:36 PM MST	Flash Flood Warning Considerable damage threat	TWC	114 min
Aug 20, 7:41 AM MST	Flash Flood Warning Considerable damage threat	TWC	11 hr
Aug 20, 8:18 AM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Aug 20, 8:45 AM MST	Flash Flood Warning Considerable damage threat	TWC	8 hr
Aug 20, 11:17 AM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Aug 20, 1:31 PM MST	Flash Flood Warning Considerable damage threat	TWC	58 min
Aug 20, 1:43 PM MST	Flash Flood Warning Considerable damage threat	TWC	50 min
Aug 21, 7:13 PM MST	Flash Flood Warning Considerable damage threat	TWC	4 hr
Aug 21, 8:59 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Aug 22, 6:03 PM MST	Flash Flood Warning Considerable damage threat	TWC	117 min
Aug 23, 7:25 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Aug 24, 6:16 PM MST	Flash Flood Warning Considerable damage threat	TWC	119 min
Aug 24, 6:57 PM MST	Flash Flood Warning Considerable damage threat	TWC	2 hr
Aug 25, 6:10 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Aug 25, 7:20 PM MST	Flash Flood Warning Considerable damage threat	TWC	115 min
Aug 27, 8:39 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Sep 9, 6:23 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Sep 9, 6:33 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Sep 11, 6:05 PM MST	Flash Flood Warning Considerable damage threat	TWC	5 hr
Sep 11, 7:25 PM MST	Flash Flood Warning Considerable damage threat	TWC	2 hr
Sep 12, 1:47 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Sep 12, 1:56 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Sep 12, 2:44 PM MST	Flash Flood Warning Considerable damage threat	TWC	106 min
Sep 12, 3:46 PM MST	Flash Flood Warning Considerable damage threat	TWC	119 min
Sep 21, 11:45 AM MST	Flash Flood Warning Considerable damage threat	TWC	5 hr
Sep 21, 1:42 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Sep 21, 2:58 PM MST	Flash Flood Warning Considerable damage threat	TWC	4 hr
Sep 21, 3:06 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Sep 21, 3:16 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Sep 21, 3:28 PM MST	Flash Flood Warning Considerable damage threat	TWC	2 hr
Sep 21, 5:40 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Sep 22, 6:01 PM MST	Flash Flood Warning	TWC	3 hr
Sep 22, 6:12 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Sep 22, 8:04 PM MST	Flash Flood Warning	TWC	3 hr
Sep 23, 4:36 PM MST	Flash Flood Warning Considerable damage threat	TWC	114 min
Sep 26, 5:33 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Sep 26, 5:54 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Sep 26, 6:57 PM MST	Flash Flood Warning Considerable damage threat	TWC	2 hr
Sep 28, 3:18 PM MST	Flash Flood Warning Considerable damage threat	TWC	117 min
Sep 28, 4:23 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr
Sep 28, 5:17 PM MST	Flash Flood Warning Considerable damage threat	TWC	2 hr
Sep 29, 2:58 PM MST	Flash Flood Warning Considerable damage threat	TWC	3 hr

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast 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.