Alert archive / California / Flash Flood Warnings

Flash Flood Warnings in California, 2021

154 flash flood warnings in 2021. 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 2021. Tap one for its archive.

Flash Flood Warnings: 154
Busiest month: July73 flash flood warnings
Busiest day: July 26, 202115 flash flood warnings

Over time

By month

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	Counties	Lasted
Jan 20, 10:11 AM PST	Flash Flood Warning Considerable damage threat	PSR	Imperial	6 hr
Jan 20, 11:29 AM PST	Flash Flood Warning Considerable damage threat	PSR	Imperial	6 hr
Jan 26, 9:39 PM PST	Flash Flood Warning Considerable damage threat	MTR	Sonoma	81 min
Jan 26, 10:56 PM PST	Flash Flood Warning Considerable damage threat	MTR	San Mateo, Santa Cruz	4 hr
Jan 27, 1:31 AM PST	Flash Flood Warning Considerable damage threat	MTR	Monterey	3 hr
Jan 27, 1:38 AM PST	Flash Flood Warning Considerable damage threat	MTR	Monterey	14 hr
Jan 27, 1:45 AM PST	Flash Flood Warning Considerable damage threat	MTR	Monterey	3 hr
Jan 27, 12:03 PM PST	Flash Flood Warning Considerable damage threat	MTR	Monterey	3 hr
Jan 27, 12:05 PM PST	Flash Flood Warning	MTR	Monterey	3 hr
Jan 27, 12:33 PM PST	Flash Flood Warning	MTR	San Mateo, Santa Cruz	6 hr
Jan 27, 4:19 PM PST	Flash Flood Warning Considerable damage threat	MTR	Monterey	5 hr
Jan 27, 7:02 PM PST	Flash Flood Warning Considerable damage threat	MTR	Monterey	3 hr
Jan 27, 7:05 PM PST	Flash Flood Warning Considerable damage threat	MTR	Monterey	3 hr
Jan 28, 12:02 AM PST	Flash Flood Warning	LOX	San Luis Obispo	4 hr
Jan 28, 1:34 AM PST	Flash Flood Warning	LOX	San Luis Obispo	56 min
Jan 28, 3:01 AM PST	Flash Flood Warning	LOX	San Luis Obispo	104 min
Jun 23, 5:33 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	2 hr
Jun 23, 7:16 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	4 hr
Jul 14, 2:47 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jul 18, 3:17 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jul 18, 5:35 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jul 18, 6:44 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	31 min
Jul 18, 7:10 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jul 19, 2:42 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo	3 hr
Jul 20, 4:45 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jul 20, 6:27 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jul 21, 12:13 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jul 21, 3:07 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	2 hr
Jul 21, 4:38 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jul 21, 5:18 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	2 hr
Jul 22, 3:45 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	2 hr
Jul 22, 4:18 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	117 min
Jul 22, 4:23 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside	2 hr
Jul 22, 5:32 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Jul 25, 12:14 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	4 hr
Jul 25, 1:12 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	4 hr
Jul 25, 2:34 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	7 hr
Jul 25, 3:20 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	5 hr
Jul 25, 3:23 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	112 min
Jul 25, 4:18 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	4 hr
Jul 25, 6:13 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	4 hr
Jul 25, 6:35 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	4 hr
Jul 25, 6:54 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Jul 25, 6:59 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jul 25, 8:08 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Jul 25, 11:13 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo, San Bernardino	3 hr
Jul 26, 3:29 AM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside	3 hr
Jul 26, 3:36 AM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	6 hr
Jul 26, 8:12 AM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jul 26, 10:44 AM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo, San Bernardino	3 hr
Jul 26, 11:36 AM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo, San Bernardino	3 hr
Jul 26, 12:29 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo	3 hr
Jul 26, 12:51 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo, San Bernardino	3 hr
Jul 26, 1:12 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo	4 hr
Jul 26, 3:17 PM PDT	Flash Flood Warning	REV	Alpine	62 min
Jul 27, 2:51 PM PDT	Flash Flood Warning	MFR	Siskiyou	9 hr
Jul 28, 1:20 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside, San Bernardino	3 hr
Jul 28, 1:21 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jul 28, 2:42 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	2 hr
Jul 28, 3:36 PM PDT	Flash Flood Warning	HNX	Fresno	67 min
Jul 28, 4:02 PM PDT	Flash Flood Warning	HNX	Fresno, Madera	58 min
Jul 28, 4:20 PM PDT	Flash Flood Warning	HNX	Madera, Tuolumne	55 min
Jul 28, 5:07 PM PDT	Flash Flood Warning	HNX	Madera, Mariposa, Tuolumne	3 min
Jul 28, 5:23 PM PDT	Flash Flood Warning	HNX	Madera, Mariposa, Tuolumne	82 min
Jul 29, 2:03 PM PDT	Flash Flood Warning	HNX	Madera, Mariposa	117 min
Jul 29, 3:21 PM PDT	Flash Flood Warning	HNX	Mariposa, Tuolumne	84 min
Jul 29, 3:46 PM PDT	Flash Flood Warning	HNX	Mariposa	119 min
Jul 29, 5:20 PM PDT	Flash Flood Warning Considerable damage threat	HNX	Madera	3 hr
Jul 30, 2:38 PM PDT	Flash Flood Warning	SGX	Riverside, San Diego	2 hr
Jul 30, 2:48 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jul 30, 2:52 PM PDT	Flash Flood Warning	HNX	Fresno, Madera	38 min
Jul 30, 3:11 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	5 hr
Jul 30, 3:30 PM PDT	Flash Flood Warning	HNX	Fresno, Madera, Mariposa	60 min
Jul 30, 3:48 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside	3 hr
Jul 30, 3:55 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside, San Bernardino	4 hr
Jul 30, 3:56 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo	5 hr
Jul 30, 4:02 PM PDT	Flash Flood Warning	HNX	Mariposa, Tuolumne	116 min
Jul 30, 4:07 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jul 30, 4:33 PM PDT	Flash Flood Warning	HNX	Mariposa	57 min
Jul 30, 4:45 PM PDT	Flash Flood Warning	REV	Mono	3 hr
Jul 30, 5:02 PM PDT	Flash Flood Warning	EKA	Del Norte	118 min
Jul 30, 5:10 PM PDT	Flash Flood Warning	REV	Alpine	110 min
Jul 30, 5:24 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	4 hr
Jul 30, 5:33 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Jul 30, 5:52 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	4 hr
Jul 30, 6:06 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Jul 30, 6:42 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo	2 hr
Jul 30, 6:49 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial, Riverside	4 hr
Jul 31, 2:34 PM PDT	Flash Flood Warning Considerable damage threat	REV	Alpine, Mono	116 min
Jul 31, 4:08 PM PDT	Flash Flood Warning	HNX	Kern	2 hr
Jul 31, 4:48 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	3 hr
Aug 1, 4:02 PM PDT	Flash Flood Warning	EKA	Del Norte	58 min
Aug 9, 2:37 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 9, 2:38 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside, San Bernardino	3 hr
Aug 10, 6:55 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 10, 7:33 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial, Riverside	4 hr
Aug 10, 9:08 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial, Riverside	6 hr
Aug 10, 9:54 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	86 min
Aug 10, 11:22 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 10, 11:27 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside, San Diego	3 hr
Aug 13, 2:32 PM PDT	Flash Flood Warning Considerable damage threat	REV	Alpine	118 min
Aug 13, 2:46 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 13, 5:19 PM PDT	Flash Flood Warning	REV	Lassen, Plumas	116 min
Aug 14, 4:57 PM PDT	Flash Flood Warning	HNX	Tulare	82 min
Aug 29, 1:18 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside, San Diego	3 hr
Aug 29, 4:29 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside, San Bernardino	3 hr
Aug 29, 4:33 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	2 hr
Aug 29, 6:53 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 30, 1:17 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 30, 2:37 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 30, 2:55 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 30, 5:14 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial, Riverside	4 hr
Aug 30, 8:13 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	50 min
Aug 30, 8:18 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside	37 min
Aug 30, 9:06 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	5 hr
Aug 31, 1:24 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial, Riverside	13 hr
Aug 31, 5:12 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial, Riverside	6 hr
Aug 31, 5:25 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 31, 5:44 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside, San Diego	96 min
Aug 31, 5:58 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial, Riverside	8 hr
Aug 31, 7:08 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 31, 7:41 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	8 hr
Sep 9, 2:34 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	3 hr
Sep 9, 3:29 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside, San Bernardino	2 hr
Sep 9, 4:33 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside	88 min
Sep 9, 5:47 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	3 hr
Sep 10, 12:19 AM PDT	Flash Flood Warning	LOX	Los Angeles	3 hr
Sep 10, 2:24 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	2 hr
Sep 10, 4:22 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	5 hr
Sep 17, 3:33 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	5 hr
Sep 24, 8:14 AM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Sep 24, 12:21 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	56 min
Sep 24, 1:28 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	2 hr
Sep 24, 2:09 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	3 hr
Oct 22, 4:25 AM PDT	Flash Flood Warning	MFR	Siskiyou	2 hr
Oct 24, 5:19 AM PDT	Flash Flood Warning Considerable damage threat	STO	Lassen, Plumas	22 hr
Oct 24, 6:11 AM PDT	Flash Flood Warning	REV	Lassen, Plumas	21 hr
Oct 24, 6:42 AM PDT	Flash Flood Warning	REV	Lassen, Plumas	20 hr
Oct 24, 7:47 AM PDT	Flash Flood Warning Considerable damage threat	STO	El Dorado	25 hr
Oct 24, 12:27 PM PDT	Flash Flood Warning Considerable damage threat	MTR	Napa, Sonoma	5 hr
Oct 24, 12:28 PM PDT	Flash Flood Warning	MTR	Napa	62 min
Oct 24, 5:45 PM PDT	Flash Flood Warning Considerable damage threat	STO	Nevada, Placer	9 hr
Oct 24, 11:10 PM PDT	Flash Flood Warning Considerable damage threat	REV	Alpine, El Dorado, Mono	6 hr
Oct 25, 1:07 AM PDT	Flash Flood Warning Considerable damage threat	MTR	Monterey	4 hr
Oct 25, 3:23 AM PDT	Flash Flood Warning	HNX	Fresno	4 hr
Oct 25, 4:02 AM PDT	Flash Flood Warning Considerable damage threat	HNX	Fresno, Madera	12 hr
Oct 25, 8:22 AM PDT	Flash Flood Warning	LOX	Santa Barbara	3 hr
Oct 25, 4:20 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	3 hr
Dec 13, 10:45 AM PST	Flash Flood Warning Considerable damage threat	MTR	San Mateo, Santa Cruz	60 min
Dec 13, 1:45 PM PST	Flash Flood Warning Considerable damage threat	MTR	Monterey	6 hr
Dec 14, 10:36 AM PST	Flash Flood Warning Considerable damage threat	SGX	Orange	3 hr
Dec 14, 11:01 AM PST	Flash Flood Warning Considerable damage threat	SGX	Orange	89 min
Dec 14, 1:27 PM PST	Flash Flood Warning Considerable damage threat	SGX	Riverside, San Bernardino	108 min
Dec 24, 1:17 AM PST	Flash Flood Warning Considerable damage threat	SGX	Riverside, San Bernardino	3 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 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. Rebuilt daily.