Alert archive / Arizona / Mohave County / Flash Flood Warnings

Flash Flood Warnings in Mohave County, Arizona, 2021

66 flash flood warnings in 2021. An alert counts here when it covered this county. The archive of flash flood warnings reaches back to 1986.

Mohave County and its neighbors

Each county as a circle sized by its count in 2021. Tap one for its archive.

Flash Flood Warnings: 66
Busiest month: July43 flash flood warnings
Busiest day: August 10, 20218 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.

20 of 66 flash flood warnings covering Mohave County in 2021 had a flash flood report inside them; 50 of 71 flash flood reports fell inside a warning, on average 98 minutes after it went out.

Mohave County, 2021

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Flash flood warnings	66	20	70%	71	70%	98 min

Each office's whole area, 2021

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Las Vegas, NV: flash flood warnings	130	42	68%	118	73%	82 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 29, 1:08 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 11, 10:58 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 14, 7:19 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 14, 11:42 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 15, 12:03 AM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 15, 1:01 AM MST	Flash Flood Warning Considerable damage threat	VEF	4 hr
Jul 17, 1:32 PM MST	Flash Flood Warning Considerable damage threat	VEF	108 min
Jul 17, 2:08 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 17, 3:53 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 17, 4:40 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 18, 2:51 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 18, 3:14 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 18, 3:46 PM MST	Flash Flood Warning Considerable damage threat	VEF	2 hr
Jul 18, 5:40 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 18, 6:20 PM MST	Flash Flood Warning Considerable damage threat	VEF	6 hr
Jul 19, 2:31 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 19, 3:31 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 19, 5:07 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 20, 3:13 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 20, 3:28 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 20, 6:47 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 21, 12:07 PM MST	Flash Flood Warning Considerable damage threat	VEF	4 hr
Jul 21, 1:24 PM MST	Flash Flood Warning Considerable damage threat	VEF	5 hr
Jul 21, 3:35 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 21, 4:03 PM MST	Flash Flood Warning Considerable damage threat	VEF	2 hr
Jul 21, 4:18 PM MST	Flash Flood Warning Considerable damage threat	VEF	2 hr
Jul 21, 4:56 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 22, 1:13 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 23, 4:39 PM MST	Flash Flood Warning Considerable damage threat	VEF	81 min
Jul 23, 11:58 PM MST	Flash Flood Warning Considerable damage threat	VEF	2 hr
Jul 24, 1:13 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 24, 3:21 PM MST	Flash Flood Warning Considerable damage threat	VEF	2 hr
Jul 25, 3:59 PM MST	Flash Flood Warning Considerable damage threat	VEF	2 hr
Jul 25, 4:21 PM MST	Flash Flood Warning Considerable damage threat	VEF	2 hr
Jul 25, 5:04 PM MST	Flash Flood Warning Considerable damage threat	VEF	5 hr
Jul 25, 5:37 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 26, 1:51 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 29, 5:12 PM MST	Flash Flood Warning Considerable damage threat	VEF	2 hr
Jul 30, 12:36 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 30, 2:22 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 30, 4:17 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 31, 12:29 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 31, 3:56 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 31, 4:15 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 31, 5:18 PM MST	Flash Flood Warning Considerable damage threat	VEF	2 hr
Aug 10, 12:30 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 10, 1:22 PM MST	Flash Flood Warning Considerable damage threat	VEF	2 hr
Aug 10, 2:05 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 10, 2:13 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 10, 2:50 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 10, 3:25 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 10, 3:51 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 10, 4:59 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 12, 5:24 PM MST	Flash Flood Warning Considerable damage threat	VEF	111 min
Aug 12, 5:43 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 12, 8:42 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 12, 8:54 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 12, 10:56 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 29, 3:43 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 29, 4:18 PM MST	Flash Flood Warning Considerable damage threat	VEF	117 min
Aug 30, 4:30 PM MST	Flash Flood Warning Considerable damage threat	VEF	100 min
Aug 30, 4:35 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 31, 7:11 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 31, 7:58 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 31, 9:38 PM MST	Flash Flood Warning Considerable damage threat	VEF	3 hr
Sep 1, 10:15 AM MST	Flash Flood Warning Considerable damage threat	VEF	116 min

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2020 2022

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.