Alert archive / California / Flash Flood Warnings

Flash Flood Warnings in California, 2025

236 flash flood warnings in 2025. 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 2025. Tap one for its archive.

Flash Flood Warnings: 236
Busiest month: December51 flash flood warnings
Busiest day: December 24, 202530 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.

92 of 236 flash flood warnings covering California in 2025 had a flash flood report inside them; 217 of 605 flash flood reports fell inside a warning, on average 141 minutes after it went out.

California, 2025

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Flash flood warnings	236	92	61%	605	36%	141 min

Each office's whole area, 2025

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Los Angeles, CA: flash flood warnings	62	29	53%	178	63%	169 min
NWS Sacramento, CA: flash flood warnings	5	2	60%	34	12%	37 min
NWS Eureka, CA: flash flood warnings	8	0	100%	111	0%
NWS San Diego, CA: flash flood warnings	36	8	78%	45	47%	208 min
NWS Medford, OR: flash flood warnings	2	0	100%	0
NWS Reno, NV: flash flood warnings	14	6	57%	32	22%	50 min
NWS San Francisco Bay Area, CA: flash flood warnings	8	5	38%	89	12%	172 min
NWS Las Vegas, NV: flash flood warnings	123	43	65%	134	67%	67 min
NWS Hanford, CA: flash flood warnings	31	9	71%	53	21%	81 min
NWS Phoenix, AZ: flash flood warnings	110	65	41%	141	89%	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, Pacific Time. Each opens its own page with the text, the map, the radar and the sounding.

Issued	Product	Office	Counties	Lasted
Jan 26, 7:40 PM PST	Flash Flood Warning	LOX	Los Angeles	2 hr
Feb 13, 3:17 AM PST	Flash Flood Warning	MTR	San Mateo, Santa Clara, Santa Cruz	6 hr
Feb 13, 3:20 AM PST	Flash Flood Warning	MTR	Santa Clara, Santa Cruz	6 hr
Feb 13, 3:29 PM PST	Flash Flood Warning	HNX	Mariposa, Merced	3 hr
Feb 13, 3:37 PM PST	Flash Flood Warning Considerable damage threat	LOX	Los Angeles	4 hr
Feb 13, 3:37 PM PST	Flash Flood Warning Considerable damage threat	LOX	Los Angeles	4 hr
Feb 13, 4:18 PM PST	Flash Flood Warning	LOX	Los Angeles, Ventura	3 hr
Feb 13, 4:24 PM PST	Flash Flood Warning Considerable damage threat	LOX	Los Angeles	3 hr
Feb 13, 5:01 PM PST	Flash Flood Warning Considerable damage threat	LOX	Los Angeles	3 hr
Feb 13, 5:01 PM PST	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	4 hr
Feb 13, 5:15 PM PST	Flash Flood Warning	LOX	Los Angeles	3 hr
Feb 13, 5:20 PM PST	Flash Flood Warning	LOX	Los Angeles	3 hr
Feb 13, 5:44 PM PST	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	3 hr
Feb 13, 7:14 PM PST	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Feb 13, 7:31 PM PST	Flash Flood Warning Considerable damage threat	SGX	Orange	3 hr
Mar 2, 3:06 PM PST	Flash Flood Warning Considerable damage threat	HNX	Kern	3 hr
Mar 13, 12:47 AM PDT	Flash Flood Warning	LOX	Ventura	3 hr
Mar 13, 1:53 AM PDT	Flash Flood Warning	LOX	Los Angeles	97 min
Mar 13, 2:32 AM PDT	Flash Flood Warning	LOX	Los Angeles	107 min
Mar 13, 4:30 AM PDT	Flash Flood Warning	SGX	Orange	3 hr
Apr 3, 4:00 PM PDT	Flash Flood Warning	LOX	Los Angeles	54 min
May 1, 1:11 PM PDT	Flash Flood Warning	LOX	Santa Barbara, Ventura	3 hr
May 1, 6:09 PM PDT	Flash Flood Warning Considerable damage threat	LOX	Los Angeles	51 min
May 4, 3:34 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	4 hr
May 4, 5:53 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
May 4, 9:27 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo, San Bernardino	3 hr
May 6, 4:12 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
May 6, 7:30 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	2 hr
Jun 3, 2:45 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jun 3, 2:49 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jun 3, 3:39 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside, San Bernardino	4 hr
Jun 3, 4:35 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jun 3, 5:20 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jun 3, 6:04 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo	3 hr
Jun 3, 6:47 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jun 3, 7:31 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jun 3, 8:20 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	3 hr
Jun 3, 10:20 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jun 3, 11:12 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	4 hr
Jun 3, 11:59 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	4 hr
Jun 4, 12:16 AM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside, San Bernardino	4 hr
Jun 5, 11:35 AM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	4 hr
Jun 5, 4:28 PM PDT	Flash Flood Warning	HNX	Mariposa, Tuolumne	62 min
Jun 5, 9:02 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jun 5, 9:18 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo, San Bernardino	3 hr
Jun 5, 9:28 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jun 6, 6:13 PM PDT	Flash Flood Warning	REV	Nevada, Sierra	34 min
Jun 10, 3:43 PM PDT	Flash Flood Warning	MFR	Siskiyou	2 hr
Jun 10, 7:20 PM PDT	Flash Flood Warning	REV	Lassen	115 min
Jul 1, 5:37 PM PDT	Flash Flood Warning	EKA	Trinity	3 hr
Jul 1, 7:21 PM PDT	Flash Flood Warning	EKA	Trinity	3 hr
Jul 1, 8:42 PM PDT	Flash Flood Warning	EKA	Trinity	3 hr
Jul 2, 9:27 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo	2 hr
Jul 17, 4:51 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jul 18, 11:54 AM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jul 18, 11:58 AM PDT	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	2 hr
Jul 18, 12:58 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	3 hr
Jul 18, 1:10 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	2 hr
Jul 18, 2:27 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	2 hr
Jul 18, 2:47 PM PDT	Flash Flood Warning Considerable damage threat	LOX	Los Angeles	3 hr
Jul 18, 2:50 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	115 min
Jul 18, 3:30 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	2 hr
Jul 18, 3:37 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside	113 min
Jul 18, 3:54 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	2 hr
Jul 18, 4:30 PM PDT	Flash Flood Warning Considerable damage threat	LOX	Los Angeles	118 min
Jul 25, 3:29 PM PDT	Flash Flood Warning	EKA	Trinity	78 min
Jul 27, 5:34 PM PDT	Flash Flood Warning	MFR	Siskiyou	2 hr
Jul 30, 5:37 PM PDT	Flash Flood Warning	EKA	Trinity	3 hr
Aug 23, 1:04 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 23, 2:30 PM PDT	Flash Flood Warning	REV	Nevada, Sierra	2 hr
Aug 23, 2:56 PM PDT	Flash Flood Warning	HNX	Madera, Mariposa, Tuolumne	2 hr
Aug 24, 2:13 PM PDT	Flash Flood Warning	HNX	Mariposa, Tuolumne	4 hr
Aug 24, 2:28 PM PDT	Flash Flood Warning	HNX	Tulare	50 min
Aug 24, 3:21 PM PDT	Flash Flood Warning	HNX	Tulare	3 hr
Aug 24, 3:22 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	3 hr
Aug 24, 4:08 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	3 hr
Aug 24, 4:27 PM PDT	Flash Flood Warning	HNX	Tuolumne	3 hr
Aug 25, 6:57 AM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	3 hr
Aug 25, 12:40 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	3 hr
Aug 25, 2:01 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	3 hr
Aug 25, 2:55 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 25, 3:00 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Aug 25, 3:01 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	119 min
Aug 25, 3:02 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside	3 hr
Aug 25, 3:21 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Aug 25, 3:25 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Aug 25, 3:32 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Aug 25, 3:40 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside, San Bernardino	4 hr
Aug 25, 3:57 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Aug 25, 4:38 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Aug 25, 4:50 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 25, 5:19 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo, San Bernardino	3 hr
Aug 25, 6:37 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	3 hr
Aug 25, 6:43 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo	3 hr
Aug 25, 7:36 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo	3 hr
Aug 25, 8:04 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo	3 hr
Aug 26, 2:13 PM PDT	Flash Flood Warning	SGX	San Bernardino	3 hr
Aug 26, 2:14 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 26, 2:30 PM PDT	Flash Flood Warning	REV	Nevada, Sierra	3 hr
Aug 26, 3:09 PM PDT	Flash Flood Warning	EKA	Trinity	3 hr
Aug 26, 4:11 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside, San Diego	3 hr
Aug 26, 4:44 PM PDT	Flash Flood Warning	EKA	Trinity	3 hr
Aug 26, 5:03 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo, San Bernardino	3 hr
Aug 26, 5:54 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo	3 hr
Aug 27, 2:37 PM PDT	Flash Flood Warning	REV	Nevada, Sierra	113 min
Sep 2, 4:15 PM PDT	Flash Flood Warning Considerable damage threat	LOX	Ventura	3 hr
Sep 3, 3:43 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Sep 4, 1:27 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Sep 4, 3:25 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial, Riverside	4 hr
Sep 4, 4:43 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	4 hr
Sep 4, 7:19 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Sep 5, 6:23 AM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Sep 5, 3:36 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Sep 5, 11:51 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo	4 hr
Sep 9, 6:56 PM PDT	Flash Flood Warning	STO	Colusa	2 hr
Sep 10, 2:02 PM PDT	Flash Flood Warning Considerable damage threat	STO	Tehama	4 hr
Sep 17, 2:59 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	3 hr
Sep 18, 8:51 AM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Sep 18, 12:36 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial, Riverside	7 hr
Sep 18, 1:20 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial, Riverside	6 hr
Sep 18, 2:13 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	5 hr
Sep 18, 3:38 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside, San Bernardino	3 hr
Sep 18, 3:43 PM PDT	Flash Flood Warning	HNX	Kern	4 hr
Sep 18, 3:46 PM PDT	Flash Flood Warning	HNX	Kern	3 hr
Sep 18, 4:14 PM PDT	Flash Flood Warning	SGX	San Bernardino	3 hr
Sep 18, 4:22 PM PDT	Flash Flood Warning	HNX	Kern	111 min
Sep 18, 4:48 PM PDT	Flash Flood Warning	SGX	San Bernardino	116 min
Sep 18, 4:56 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	3 hr
Sep 18, 4:59 PM PDT	Flash Flood Warning	HNX	Kern	3 hr
Sep 18, 5:05 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside, San Diego	85 min
Sep 18, 5:11 PM PDT	Flash Flood Warning	HNX	Kern	6 hr
Sep 18, 5:26 PM PDT	Flash Flood Warning	SGX	San Bernardino	103 min
Sep 18, 5:52 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	3 hr
Sep 18, 6:31 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	2 hr
Sep 18, 6:41 PM PDT	Flash Flood Warning	HNX	Kern	4 hr
Sep 18, 7:20 PM PDT	Flash Flood Warning	HNX	Kern	98 min
Sep 19, 12:38 AM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo	4 hr
Sep 22, 2:47 AM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Sep 26, 3:26 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Sep 27, 5:22 AM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial, Riverside	3 hr
Sep 27, 8:59 AM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	3 hr
Sep 27, 9:57 AM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	3 hr
Sep 27, 11:08 AM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	3 hr
Sep 27, 12:38 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Sep 27, 1:02 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Sep 27, 1:09 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	3 hr
Sep 27, 2:07 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	3 hr
Sep 27, 4:22 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Sep 27, 4:58 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial, Riverside	3 hr
Sep 27, 5:34 PM PDT	Flash Flood Warning Considerable damage threat	LOX	Los Angeles	2 hr
Sep 27, 6:52 PM PDT	Flash Flood Warning	LOX	Los Angeles	68 min
Oct 9, 4:28 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo	3 hr
Oct 9, 7:09 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo	3 hr
Oct 10, 4:44 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo, San Bernardino	3 hr
Oct 13, 2:43 PM PDT	Flash Flood Warning Considerable damage threat	MTR	Napa	2 hr
Oct 13, 11:54 PM PDT	Flash Flood Warning	LOX	San Luis Obispo	4 hr
Oct 14, 1:01 AM PDT	Flash Flood Warning	LOX	San Luis Obispo, Santa Barbara	4 hr
Oct 14, 3:19 AM PDT	Flash Flood Warning	LOX	Santa Barbara	3 hr
Oct 14, 7:49 AM PDT	Flash Flood Warning Considerable damage threat	LOX	Los Angeles	4 hr
Oct 14, 9:53 AM PDT	Flash Flood Warning	LOX	Los Angeles	3 hr
Nov 13, 11:49 PM PST	Flash Flood Warning Considerable damage threat	LOX	Santa Barbara	3 hr
Nov 15, 3:48 AM PST	Flash Flood Warning Considerable damage threat	LOX	Santa Barbara	117 min
Nov 15, 5:32 AM PST	Flash Flood Warning	LOX	Los Angeles	8 hr
Nov 15, 5:32 AM PST	Flash Flood Warning	LOX	Ventura	6 hr
Nov 15, 5:36 AM PST	Flash Flood Warning Considerable damage threat	LOX	Los Angeles	8 hr
Nov 15, 8:37 AM PST	Flash Flood Warning	LOX	Los Angeles	5 hr
Nov 15, 9:39 AM PST	Flash Flood Warning Considerable damage threat	LOX	Los Angeles	4 hr
Nov 15, 9:49 AM PST	Flash Flood Warning	LOX	Los Angeles	4 hr
Nov 15, 10:09 AM PST	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	3 hr
Nov 15, 12:42 PM PST	Flash Flood Warning	HNX	Kern	2 hr
Nov 15, 1:30 PM PST	Flash Flood Warning	HNX	Kern	3 hr
Nov 15, 3:43 PM PST	Flash Flood Warning Considerable damage threat	HNX	Kern	80 min
Nov 15, 3:55 PM PST	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Nov 16, 2:22 AM PST	Flash Flood Warning	LOX	Los Angeles	53 min
Nov 16, 11:33 PM PST	Flash Flood Warning Considerable damage threat	MTR	Napa	108 min
Nov 17, 4:48 PM PST	Flash Flood Warning	LOX	Los Angeles	2 hr
Nov 17, 6:49 PM PST	Flash Flood Warning	LOX	Los Angeles	2 hr
Nov 20, 6:35 PM PST	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	115 min
Nov 20, 9:50 PM PST	Flash Flood Warning	HNX	Kern	115 min
Nov 20, 10:00 PM PST	Flash Flood Warning Considerable damage threat	SGX	Orange	2 hr
Nov 21, 1:11 AM PST	Flash Flood Warning	LOX	Los Angeles	3 hr
Nov 21, 1:45 AM PST	Flash Flood Warning	LOX	Los Angeles	4 hr
Nov 21, 2:19 AM PST	Flash Flood Warning	LOX	Los Angeles	4 hr
Nov 21, 3:37 AM PST	Flash Flood Warning Considerable damage threat	SGX	Orange	113 min
Nov 21, 4:25 AM PST	Flash Flood Warning	HNX	Kern	80 min
Dec 21, 10:51 AM PST	Flash Flood Warning	EKA	Humboldt, Trinity	62 min
Dec 21, 4:43 PM PST	Flash Flood Warning	STO	Shasta	5 hr
Dec 24, 4:02 AM PST	Flash Flood Warning	LOX	Santa Barbara, Ventura	8 hr
Dec 24, 5:35 AM PST	Flash Flood Warning	LOX	Los Angeles	6 hr
Dec 24, 5:45 AM PST	Flash Flood Warning	LOX	Ventura	6 hr
Dec 24, 5:51 AM PST	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	12 hr
Dec 24, 5:56 AM PST	Flash Flood Warning	LOX	Los Angeles	6 hr
Dec 24, 6:09 AM PST	Flash Flood Warning	LOX	San Luis Obispo, Santa Barbara	6 hr
Dec 24, 6:22 AM PST	Flash Flood Warning	HNX	Fresno, Madera	3 hr
Dec 24, 6:35 AM PST	Flash Flood Warning Considerable damage threat	LOX	Santa Barbara	5 hr
Dec 24, 6:35 AM PST	Flash Flood Warning Considerable damage threat	LOX	Ventura	5 hr
Dec 24, 6:42 AM PST	Flash Flood Warning	HNX	Fresno, Madera	4 hr
Dec 24, 6:45 AM PST	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	12 hr
Dec 24, 6:59 AM PST	Flash Flood Warning	LOX	Los Angeles, Ventura	5 hr
Dec 24, 7:03 AM PST	Flash Flood Warning Considerable damage threat	HNX	Kern	5 hr
Dec 24, 7:03 AM PST	Flash Flood Warning	LOX	Los Angeles, Ventura	5 hr
Dec 24, 7:04 AM PST	Flash Flood Warning Considerable damage threat	LOX	Los Angeles, Ventura	5 hr
Dec 24, 7:05 AM PST	Flash Flood Warning	HNX	Kern	5 hr
Dec 24, 7:24 AM PST	Flash Flood Warning Considerable damage threat	HNX	Kern	10 hr
Dec 24, 7:53 AM PST	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	3 hr
Dec 24, 8:05 AM PST	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	11 hr
Dec 24, 8:36 AM PST	Flash Flood Warning Considerable damage threat	HNX	Kern	114 min
Dec 24, 8:40 AM PST	Flash Flood Warning Considerable damage threat	HNX	Kern	4 hr
Dec 24, 9:53 AM PST	Flash Flood Warning	LOX	Los Angeles	2 hr
Dec 24, 10:06 AM PST	Flash Flood Warning Considerable damage threat	HNX	Kern	7 hr
Dec 24, 10:34 AM PST	Flash Flood Warning Considerable damage threat	VEF	Inyo	7 hr
Dec 24, 10:53 AM PST	Flash Flood Warning	LOX	Los Angeles	67 min
Dec 24, 11:03 AM PST	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	5 hr
Dec 24, 11:55 AM PST	Flash Flood Warning Considerable damage threat	LOX	Los Angeles, Santa Barbara, Ventura	6 hr
Dec 24, 12:01 PM PST	Flash Flood Warning	LOX	Los Angeles	5 hr
Dec 24, 12:06 PM PST	Flash Flood Warning	LOX	Los Angeles	5 hr
Dec 24, 1:34 PM PST	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	6 hr
Dec 24, 4:35 PM PST	Flash Flood Warning	STO	Sacramento, Yolo	51 min
Dec 24, 5:00 PM PST	Flash Flood Warning	STO	Placer, Sacramento, Sutter	55 min
Dec 24, 6:41 PM PST	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Dec 25, 12:59 AM PST	Flash Flood Warning	LOX	Santa Barbara, Ventura	4 hr
Dec 25, 2:01 AM PST	Flash Flood Warning Considerable damage threat	MTR	San Mateo	3 hr
Dec 25, 2:04 AM PST	Flash Flood Warning	LOX	Ventura	5 hr
Dec 25, 2:56 AM PST	Flash Flood Warning Considerable damage threat	MTR	City and County of San Francisco, San Mateo	2 hr
Dec 25, 3:01 AM PST	Flash Flood Warning	MTR	Alameda, Contra Costa	3 hr
Dec 25, 3:11 AM PST	Flash Flood Warning Considerable damage threat	MTR	San Mateo, Santa Clara	3 hr
Dec 25, 8:53 AM PST	Flash Flood Warning	LOX	Los Angeles	82 min
Dec 25, 9:29 AM PST	Flash Flood Warning Considerable damage threat	HNX	Fresno	9 hr
Dec 25, 11:04 AM PST	Flash Flood Warning Considerable damage threat	LOX	Santa Barbara, Ventura	19 hr
Dec 25, 11:48 AM PST	Flash Flood Warning	LOX	Santa Barbara	13 hr
Dec 25, 1:26 PM PST	Flash Flood Warning	HNX	Fresno, Tulare	3 hr
Dec 25, 1:28 PM PST	Flash Flood Warning	LOX	Santa Barbara	12 hr
Dec 25, 3:24 PM PST	Flash Flood Warning	LOX	Ventura	15 hr
Dec 25, 7:28 PM PST	Flash Flood Warning	LOX	Ventura	11 hr
Dec 26, 3:38 AM PST	Flash Flood Warning	LOX	Los Angeles	3 hr
Dec 26, 4:21 AM PST	Flash Flood Warning	HNX	Madera, Mariposa	101 min

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record The radar archive 2024 2026

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.