Alert archive / Nevada / Clark County / Flash Flood Warnings

Flash Flood Warnings in Clark County, Nevada, 2022

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

Clark County and its neighbors

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

Flash Flood Warnings: 80
Busiest month: August30 flash flood warnings
Busiest day: July 31, 202210 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.

23 of 82 flash flood warnings covering Clark County in 2022 had a flash flood report inside them; 20 of 29 flash flood reports fell inside a warning, on average 66 minutes after it went out.

Clark County, 2022

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Flash flood warnings	82	23	72%	29	69%	66 min

Each office's whole area, 2022

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Las Vegas, NV: flash flood warnings	347	140	60%	414	70%	84 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, Pacific Time. Each opens its own page with the text, the map, the radar and the sounding.

Issued	Product	Office	Lasted
Jul 18, 7:01 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 25, 1:58 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 25, 2:42 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 25, 5:59 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 26, 11:52 AM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 26, 12:24 PM PDT	Flash Flood Warning Considerable damage threat	VEF	2 hr
Jul 26, 3:00 PM PDT	Flash Flood Warning Considerable damage threat	VEF	113 min
Jul 27, 2:38 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 27, 7:19 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 28, 7:47 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 28, 9:12 PM PDT	Flash Flood Warning Considerable damage threat	VEF	93 min
Jul 28, 9:49 PM PDT	Flash Flood Warning Considerable damage threat	VEF	116 min
Jul 28, 11:29 PM PDT	Flash Flood Warning Considerable damage threat	VEF	2 hr
Jul 29, 6:36 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 29, 8:50 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 29, 9:19 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 31, 10:12 AM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 31, 11:19 AM PDT	Flash Flood Warning Considerable damage threat	VEF	109 min
Jul 31, 11:25 AM PDT	Flash Flood Warning Considerable damage threat	VEF	5 hr
Jul 31, 12:22 PM PDT	Flash Flood Warning Considerable damage threat	VEF	7 hr
Jul 31, 1:04 PM PDT	Flash Flood Warning Considerable damage threat	VEF	116 min
Jul 31, 1:12 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 31, 2:12 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Jul 31, 3:07 PM PDT	Flash Flood Warning Considerable damage threat	VEF	113 min
Jul 31, 3:58 PM PDT	Flash Flood Warning Considerable damage threat	VEF	6 hr
Jul 31, 4:51 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 1, 11:30 AM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 1, 12:09 PM PDT	Flash Flood Warning Considerable damage threat	VEF	4 hr
Aug 1, 1:51 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 1, 3:44 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 1, 5:39 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 1, 6:05 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 9, 1:26 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 9, 1:45 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 9, 2:32 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 9, 5:55 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 10, 12:32 PM PDT	Flash Flood Warning Considerable damage threat	VEF	30 hr
Aug 10, 12:39 PM PDT	Flash Flood Warning Considerable damage threat	VEF	30 hr
Aug 10, 1:44 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 10, 2:28 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 10, 2:54 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 10, 4:05 PM PDT	Flash Flood Warning Considerable damage threat	VEF	2 hr
Aug 10, 5:02 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 12, 12:39 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 12, 12:59 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 12, 2:59 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 12, 3:39 PM PDT	Flash Flood Warning Considerable damage threat	VEF	2 hr
Aug 13, 12:55 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 14, 12:33 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 15, 2:24 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 15, 9:15 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 17, 2:12 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 18, 3:52 PM PDT	Flash Flood Warning Considerable damage threat	VEF	2 hr
Aug 24, 2:30 PM PDT	Flash Flood Warning Considerable damage threat	VEF	4 hr
Aug 24, 7:59 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Aug 25, 2:14 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Sep 8, 4:35 PM PDT	Flash Flood Warning Considerable damage threat	VEF	70 min
Sep 10, 8:58 AM PDT	Flash Flood Warning Considerable damage threat	VEF	2 hr
Sep 10, 9:51 AM PDT	Flash Flood Warning Considerable damage threat	VEF	114 min
Sep 10, 1:00 PM PDT	Flash Flood Warning Considerable damage threat	VEF	2 hr
Sep 10, 4:07 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Sep 12, 5:00 AM PDT	Flash Flood Warning Considerable damage threat	VEF	90 min
Sep 12, 1:11 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Sep 12, 7:31 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Sep 13, 12:17 PM PDT	Flash Flood Warning Considerable damage threat	VEF	2 hr
Sep 13, 1:26 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Sep 13, 2:20 PM PDT	Flash Flood Warning Considerable damage threat	VEF	2 hr
Sep 13, 4:35 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Sep 13, 5:07 PM PDT	Flash Flood Warning Considerable damage threat	VEF	113 min
Sep 13, 6:32 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Sep 13, 8:34 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Sep 13, 9:09 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Sep 13, 10:46 PM PDT	Flash Flood Warning Considerable damage threat	VEF	119 min
Sep 13, 11:09 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Sep 13, 11:26 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Sep 13, 11:41 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Sep 28, 11:10 AM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Sep 29, 2:23 PM PDT	Flash Flood Warning Considerable damage threat	VEF	55 min
Oct 2, 1:58 PM PDT	Flash Flood Warning Considerable damage threat	VEF	3 hr
Oct 15, 10:47 AM PDT	Flash Flood Warning Considerable damage threat	VEF	118 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 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.