Alert archive / California / Areal Flood Advisories

Areal Flood Advisories in California, 2021

242 areal flood advisories 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 areal flood advisories reaches back to 2005.

Areal Flood Advisories by county

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

Areal Flood Advisories: 242
Busiest month: December67 areal flood advisories
Busiest day: December 14, 202119 areal flood advisories

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 25, 3:05 AM PST	Areal Flood Advisory	SGX	Orange	3 hr
Jan 26, 10:22 PM PST	Areal Flood Advisory	MTR	Marin, Napa, Sonoma	4 hr
Jan 26, 11:18 PM PST	Areal Flood Advisory	MTR	Alameda, City and County of San Francisco, San Mateo, Santa Clara	4 hr
Jan 27, 12:48 AM PST	Areal Flood Advisory	STO	Amador, Calaveras, Colusa, El Dorado, Nevada, Placer and 6 more	5 hr
Jan 27, 12:48 AM PST	Areal Flood Advisory	STO	Calaveras, San Joaquin, Stanislaus, Tuolumne	5 hr
Jan 27, 2:18 AM PST	Areal Flood Advisory	MTR	Monterey, Santa Cruz	117 min
Jan 27, 6:17 AM PST	Areal Flood Advisory	LOX	San Luis Obispo	4 hr
Jan 27, 9:29 AM PST	Areal Flood Advisory	HNX	Fresno, Kings, Madera	3 hr
Jan 27, 10:13 AM PST	Areal Flood Advisory	LOX	San Luis Obispo	3 hr
Jan 27, 11:50 AM PST	Areal Flood Advisory	HNX	Fresno, Kings, Madera, Mariposa, Merced, Tulare and 1 more	3 hr
Jan 27, 2:11 PM PST	Areal Flood Advisory	MTR	Alameda, Monterey, San Benito, San Mateo, Santa Clara, Santa Cruz	5 hr
Jan 27, 2:47 PM PST	Areal Flood Advisory	HNX	Fresno, Kings, Madera, Mariposa, Merced, Tuolumne	6 hr
Jan 27, 4:02 PM PST	Areal Flood Advisory	MTR	Monterey, San Benito	3 hr
Jan 27, 7:32 PM PST	Areal Flood Advisory	MTR	Monterey, San Benito, Santa Clara, Santa Cruz	3 hr
Jan 27, 8:49 PM PST	Areal Flood Advisory	HNX	Fresno, Merced	6 hr
Jan 27, 10:39 PM PST	Areal Flood Advisory	MTR	Monterey, San Benito, Santa Clara, Santa Cruz	4 hr
Jan 27, 11:48 PM PST	Areal Flood Advisory	LOX	San Luis Obispo	10 hr
Jan 28, 4:33 AM PST	Areal Flood Advisory	MTR	Monterey, San Benito, Santa Clara, Santa Cruz	11 hr
Jan 28, 5:49 AM PST	Areal Flood Advisory	LOX	Santa Barbara	8 hr
Jan 28, 6:59 AM PST	Areal Flood Advisory	HNX	Fresno	6 hr
Jan 28, 8:29 AM PST	Areal Flood Advisory	HNX	Fresno, Madera, Mariposa, Merced, Tuolumne	3 hr
Jan 28, 11:41 AM PST	Areal Flood Advisory	HNX	Fresno, Kern, Kings, Madera, Mariposa, Merced and 2 more	3 hr
Jan 28, 1:03 PM PST	Areal Flood Advisory	LOX	Santa Barbara	6 hr
Jan 28, 2:34 PM PST	Areal Flood Advisory	HNX	Fresno, Kern, Kings, Madera, Mariposa, Merced and 2 more	2 hr
Jan 28, 2:53 PM PST	Areal Flood Advisory	HNX	Fresno, Kings	112 min
Jan 28, 4:42 PM PST	Areal Flood Advisory	LOX	Ventura	6 hr
Jan 28, 4:53 PM PST	Areal Flood Advisory	HNX	Fresno, Kern, Kings, Madera, Mariposa, Merced and 2 more	9 hr
Jan 28, 6:41 PM PST	Areal Flood Advisory	LOX	Los Angeles	4 hr
Jan 28, 8:11 PM PST	Areal Flood Advisory	LOX	Los Angeles	5 hr
Jan 28, 8:52 PM PST	Areal Flood Advisory	HNX	Fresno, Kern, Tulare	3 hr
Jan 28, 9:32 PM PST	Areal Flood Advisory	SGX	Orange, Riverside, San Bernardino	3 hr
Jan 28, 10:16 PM PST	Areal Flood Advisory	SGX	Orange, Riverside, San Bernardino	3 hr
Jan 29, 12:34 AM PST	Areal Flood Advisory	SGX	San Diego	3 hr
Jan 29, 1:43 AM PST	Areal Flood Advisory	HNX	Fresno, Kern, Kings, Madera, Mariposa, Merced and 2 more	3 hr
Jan 29, 3:35 PM PST	Areal Flood Advisory	SGX	San Diego	2 hr
Feb 1, 9:32 AM PST	Areal Flood Advisory	MFR	Siskiyou	18 hr
Feb 12, 10:03 AM PST	Areal Flood Advisory	SGX	Riverside, San Bernardino	59 min
Mar 3, 12:05 PM PST	Areal Flood Advisory	SGX	San Diego	3 hr
Mar 10, 2:34 AM PST	Areal Flood Advisory	LOX	Los Angeles	88 min
Mar 10, 10:17 PM PST	Areal Flood Advisory	SGX	Orange	88 min
Mar 12, 1:53 PM PST	Areal Flood Advisory	SGX	Orange	3 hr
Mar 12, 5:06 PM PST	Areal Flood Advisory	SGX	Riverside	2 hr
Mar 19, 3:38 AM PDT	Areal Flood Advisory	MTR	Monterey	112 min
May 14, 7:48 PM PDT	Areal Flood Advisory	STO	Shasta, Tehama	3 hr
Jun 2, 4:29 PM PDT	Areal Flood Advisory	HNX	Madera, Mariposa, Tuolumne	2 hr
Jun 23, 4:51 PM PDT	Areal Flood Advisory	PSR	Riverside	42 min
Jun 23, 6:28 PM PDT	Areal Flood Advisory	PSR	Riverside	3 hr
Jun 24, 12:48 PM PDT	Areal Flood Advisory	REV	Mono	117 min
Jun 24, 1:13 PM PDT	Areal Flood Advisory	VEF	San Bernardino	3 hr
Jun 24, 2:11 PM PDT	Areal Flood Advisory	VEF	San Bernardino	4 hr
Jun 24, 2:24 PM PDT	Areal Flood Advisory	REV	Alpine, Mono	105 min
Jun 29, 3:36 PM PDT	Areal Flood Advisory	REV	Alpine, Mono	114 min
Jun 29, 4:23 PM PDT	Areal Flood Advisory	VEF	Inyo	3 hr
Jun 29, 4:30 PM PDT	Areal Flood Advisory	REV	Mono	2 hr
Jun 30, 2:36 PM PDT	Areal Flood Advisory	REV	Mono	114 min
Jun 30, 3:42 PM PDT	Areal Flood Advisory	HNX	Madera, Mariposa, Tuolumne	2 hr
Jul 1, 5:26 PM PDT	Areal Flood Advisory	REV	Alpine	2 hr
Jul 3, 5:01 PM PDT	Areal Flood Advisory	REV	Lassen	63 min
Jul 3, 5:31 PM PDT	Areal Flood Advisory	REV	Lassen	3 hr
Jul 10, 6:13 PM PDT	Areal Flood Advisory	REV	Mono	88 min
Jul 13, 12:46 PM PDT	Areal Flood Advisory	REV	Mono	119 min
Jul 17, 4:12 PM PDT	Areal Flood Advisory	SGX	San Diego	100 min
Jul 18, 2:05 PM PDT	Areal Flood Advisory	SGX	San Diego	58 min
Jul 18, 6:12 PM PDT	Areal Flood Advisory	SGX	San Bernardino	32 min
Jul 18, 6:24 PM PDT	Areal Flood Advisory	VEF	San Bernardino	47 min
Jul 18, 6:38 PM PDT	Areal Flood Advisory	SGX	San Bernardino	52 min
Jul 22, 4:40 PM PDT	Areal Flood Advisory	PSR	Imperial	3 hr
Jul 25, 2:18 PM PDT	Areal Flood Advisory	HNX	Madera	117 min
Jul 25, 3:08 PM PDT	Areal Flood Advisory	SGX	San Diego	15 min
Jul 25, 3:44 PM PDT	Areal Flood Advisory	VEF	San Bernardino	3 hr
Jul 25, 4:32 PM PDT	Areal Flood Advisory	SGX	San Diego	77 min
Jul 25, 4:37 PM PDT	Areal Flood Advisory	VEF	San Bernardino	3 hr
Jul 26, 1:52 AM PDT	Areal Flood Advisory	PSR	Imperial	3 hr
Jul 26, 2:11 AM PDT	Areal Flood Advisory	SGX	San Bernardino	2 hr
Jul 26, 4:53 AM PDT	Areal Flood Advisory	SGX	Riverside, San Diego	3 hr
Jul 26, 6:32 AM PDT	Areal Flood Advisory	SGX	Riverside	2 hr
Jul 26, 6:49 AM PDT	Areal Flood Advisory	PSR	Riverside	3 hr
Jul 26, 7:59 AM PDT	Areal Flood Advisory	VEF	San Bernardino	3 hr
Jul 26, 8:01 AM PDT	Areal Flood Advisory	PSR	Riverside, San Bernardino	3 hr
Jul 26, 9:26 AM PDT	Areal Flood Advisory	VEF	San Bernardino	3 hr
Jul 26, 2:28 PM PDT	Areal Flood Advisory	REV	Alpine, Mono	92 min
Jul 27, 3:52 PM PDT	Areal Flood Advisory	SGX	San Bernardino	74 min
Jul 27, 5:56 PM PDT	Areal Flood Advisory	VEF	San Bernardino	2 hr
Jul 28, 11:49 AM PDT	Areal Flood Advisory	PSR	Riverside	3 hr
Jul 28, 12:59 PM PDT	Areal Flood Advisory	VEF	San Bernardino	22 min
Jul 28, 1:00 PM PDT	Areal Flood Advisory	PSR	Riverside, San Bernardino	20 min
Jul 28, 2:00 PM PDT	Areal Flood Advisory	PSR	Riverside	42 min
Jul 28, 3:18 PM PDT	Areal Flood Advisory	SGX	San Diego	3 hr
Jul 28, 3:47 PM PDT	Areal Flood Advisory	SGX	Riverside	3 hr
Jul 28, 4:07 PM PDT	Areal Flood Advisory	PSR	Riverside	3 hr
Jul 29, 4:41 PM PDT	Areal Flood Advisory	HNX	Mariposa, Tuolumne	64 min
Jul 29, 6:48 PM PDT	Areal Flood Advisory	REV	Plumas	3 hr
Jul 30, 1:41 PM PDT	Areal Flood Advisory	SGX	San Bernardino	4 hr
Jul 30, 2:48 PM PDT	Areal Flood Advisory	SGX	Riverside	3 hr
Jul 30, 2:53 PM PDT	Areal Flood Advisory	VEF	Inyo	3 hr
Jul 30, 2:54 PM PDT	Areal Flood Advisory	SGX	San Bernardino	3 hr
Jul 30, 3:35 PM PDT	Areal Flood Advisory	REV	Mono	115 min
Jul 30, 5:13 PM PDT	Areal Flood Advisory	VEF	San Bernardino	2 hr
Jul 30, 5:39 PM PDT	Areal Flood Advisory	PSR	Imperial	3 hr
Jul 30, 5:42 PM PDT	Areal Flood Advisory	REV	Alpine, Mono	3 hr
Jul 30, 6:27 PM PDT	Areal Flood Advisory	REV	Alpine, Mono	6 hr
Jul 31, 12:43 PM PDT	Areal Flood Advisory	SGX	Riverside, San Bernardino	3 hr
Jul 31, 1:14 PM PDT	Areal Flood Advisory	SGX	Riverside, San Diego	5 hr
Jul 31, 1:30 PM PDT	Areal Flood Advisory	SGX	San Diego	3 hr
Jul 31, 2:49 PM PDT	Areal Flood Advisory	SGX	San Bernardino	3 hr
Jul 31, 3:41 PM PDT	Areal Flood Advisory	REV	Mono	3 hr
Jul 31, 5:50 PM PDT	Areal Flood Advisory	SGX	Riverside, San Diego	2 hr
Jul 31, 6:34 PM PDT	Areal Flood Advisory	EKA	Trinity	79 min
Aug 1, 2:01 PM PDT	Areal Flood Advisory	REV	Lassen, Modoc	119 min
Aug 9, 1:44 PM PDT	Areal Flood Advisory	PSR	Riverside, San Bernardino	3 hr
Aug 9, 1:49 PM PDT	Areal Flood Advisory	VEF	San Bernardino	3 hr
Aug 9, 2:21 PM PDT	Areal Flood Advisory	SGX	Riverside	3 hr
Aug 9, 3:26 PM PDT	Areal Flood Advisory	PSR	Riverside	3 hr
Aug 9, 5:06 PM PDT	Areal Flood Advisory	PSR	Riverside	3 hr
Aug 9, 5:26 PM PDT	Areal Flood Advisory	SGX	San Diego	2 hr
Aug 9, 6:09 PM PDT	Areal Flood Advisory	PSR	Riverside, San Bernardino	115 min
Aug 10, 1:53 PM PDT	Areal Flood Advisory	SGX	Riverside, San Bernardino	101 min
Aug 10, 3:11 PM PDT	Areal Flood Advisory	PSR	Riverside, San Bernardino	3 hr
Aug 10, 10:26 PM PDT	Areal Flood Advisory	SGX	Riverside, San Diego	3 hr
Aug 13, 3:01 PM PDT	Areal Flood Advisory	REV	Nevada, Placer	3 hr
Aug 13, 7:20 PM PDT	Areal Flood Advisory	SGX	San Bernardino	115 min
Aug 29, 12:49 PM PDT	Areal Flood Advisory	SGX	Riverside	3 hr
Aug 29, 3:51 PM PDT	Areal Flood Advisory	SGX	San Diego	114 min
Aug 29, 4:24 PM PDT	Areal Flood Advisory	SGX	San Bernardino	3 hr
Aug 30, 11:30 AM PDT	Areal Flood Advisory	SGX	San Bernardino	3 hr
Aug 30, 12:22 PM PDT	Areal Flood Advisory	SGX	San Diego	113 min
Aug 30, 1:17 PM PDT	Areal Flood Advisory	SGX	Riverside, San Diego	118 min
Aug 30, 2:22 PM PDT	Areal Flood Advisory	SGX	Riverside	113 min
Aug 30, 6:49 PM PDT	Areal Flood Advisory	PSR	Imperial	3 hr
Aug 30, 7:52 PM PDT	Areal Flood Advisory	PSR	Riverside	23 min
Aug 31, 5:46 AM PDT	Areal Flood Advisory	PSR	Imperial	3 hr
Aug 31, 1:13 PM PDT	Areal Flood Advisory	PSR	Imperial, Riverside	6 hr
Sep 9, 2:12 PM PDT	Areal Flood Advisory	SGX	San Diego	3 hr
Sep 9, 3:46 PM PDT	Areal Flood Advisory	SGX	Riverside	3 hr
Sep 9, 5:07 PM PDT	Areal Flood Advisory	LOX	Los Angeles	3 hr
Sep 9, 5:27 PM PDT	Areal Flood Advisory	REV	Lassen	63 min
Sep 10, 12:01 AM PDT	Areal Flood Advisory	LOX	Los Angeles	18 min
Sep 10, 1:15 PM PDT	Areal Flood Advisory	SGX	Riverside, San Diego	3 hr
Sep 10, 3:13 PM PDT	Areal Flood Advisory	SGX	Riverside	108 min
Sep 17, 3:17 PM PDT	Areal Flood Advisory	PSR	Riverside	25 min
Sep 17, 5:41 PM PDT	Areal Flood Advisory	PSR	Imperial, Riverside	2 hr
Sep 24, 7:28 AM PDT	Areal Flood Advisory	PSR	Imperial	46 min
Sep 24, 1:49 PM PDT	Areal Flood Advisory	VEF	San Bernardino	3 hr
Sep 24, 2:18 PM PDT	Areal Flood Advisory	VEF	San Bernardino	3 hr
Oct 5, 5:21 AM PDT	Areal Flood Advisory	PSR	Imperial	96 min
Oct 22, 4:16 AM PDT	Areal Flood Advisory	STO	Colusa, Glenn, Shasta, Tehama	5 hr
Oct 22, 5:15 AM PDT	Areal Flood Advisory	STO	Butte, Lassen, Plumas, Shasta, Sierra, Tehama	7 hr
Oct 22, 8:14 AM PDT	Areal Flood Advisory	REV	Lassen, Plumas	3 hr
Oct 24, 4:58 AM PDT	Areal Flood Advisory	EKA	Lake, Mendocino	3 hr
Oct 24, 5:28 AM PDT	Areal Flood Advisory	MTR	Marin, Napa, Sonoma	18 hr
Oct 24, 5:48 AM PDT	Areal Flood Advisory	EKA	Lake, Mendocino	5 hr
Oct 24, 7:25 AM PDT	Areal Flood Advisory	EKA	Humboldt, Trinity	4 hr
Oct 24, 8:00 AM PDT	Areal Flood Advisory	REV	Lassen, Plumas, Sierra	3 hr
Oct 24, 8:24 AM PDT	Areal Flood Advisory	EKA	Lake, Mendocino	7 hr
Oct 24, 9:52 AM PDT	Areal Flood Advisory	STO	Amador, Butte, Calaveras, Colusa, El Dorado, Glenn and 12 more	40 hr
Oct 24, 1:58 PM PDT	Areal Flood Advisory	MTR	Marin	9 hr
Oct 24, 3:55 PM PDT	Areal Flood Advisory	MTR	Marin	7 hr
Oct 24, 4:15 PM PDT	Areal Flood Advisory	MTR	Alameda, Contra Costa	10 hr
Oct 24, 4:19 PM PDT	Areal Flood Advisory	MTR	City and County of San Francisco, San Mateo, Santa Clara, Santa Cruz	10 hr
Oct 24, 6:26 PM PDT	Areal Flood Advisory	EKA	Lake, Mendocino	109 min
Oct 24, 8:19 PM PDT	Areal Flood Advisory	MTR	Monterey, San Benito, San Mateo, Santa Clara, Santa Cruz	9 hr
Oct 24, 11:46 PM PDT	Areal Flood Advisory	HNX	Fresno, Madera, Mariposa, Merced, Tuolumne	6 hr
Oct 25, 12:06 AM PDT	Areal Flood Advisory	STO	Calaveras, San Joaquin, Stanislaus, Tuolumne	26 hr
Oct 25, 2:14 AM PDT	Areal Flood Advisory	HNX	Fresno, Kern, Kings, Madera, Tulare	16 hr
Oct 25, 4:44 AM PDT	Areal Flood Advisory	STO	Tehama	4 hr
Oct 25, 5:25 AM PDT	Areal Flood Advisory	LOX	San Luis Obispo	3 hr
Oct 25, 5:52 AM PDT	Areal Flood Advisory	HNX	Fresno, Madera, Mariposa, Merced, Tuolumne	6 hr
Oct 25, 7:34 AM PDT	Areal Flood Advisory	LOX	Santa Barbara	5 hr
Oct 25, 8:54 AM PDT	Areal Flood Advisory	LOX	San Luis Obispo, Santa Barbara	3 hr
Oct 25, 10:09 AM PDT	Areal Flood Advisory	LOX	Ventura	4 hr
Oct 25, 12:24 PM PDT	Areal Flood Advisory	LOX	Los Angeles	4 hr
Oct 25, 3:39 PM PDT	Areal Flood Advisory	HNX	Kern, Tulare	2 hr
Oct 25, 4:13 PM PDT	Areal Flood Advisory	SGX	Riverside, San Bernardino	4 hr
Oct 25, 6:05 PM PDT	Areal Flood Advisory	HNX	Kern	55 min
Oct 25, 6:31 PM PDT	Areal Flood Advisory	HNX	Kern	59 min
Dec 13, 4:29 AM PST	Areal Flood Advisory	MTR	San Mateo, Santa Clara, Santa Cruz	18 hr
Dec 13, 5:31 AM PST	Areal Flood Advisory	MTR	Alameda, Contra Costa, San Mateo, Santa Clara	7 hr
Dec 13, 9:14 AM PST	Areal Flood Advisory	MTR	City and County of San Francisco, San Mateo, Santa Clara, Santa Cruz	3 hr
Dec 13, 1:26 PM PST	Areal Flood Advisory	MTR	San Mateo	11 hr
Dec 13, 6:45 PM PST	Areal Flood Advisory	STO	Amador, Butte, Calaveras, Colusa, El Dorado, Glenn and 13 more	11 hr
Dec 13, 6:56 PM PST	Areal Flood Advisory	LOX	San Luis Obispo	15 hr
Dec 13, 7:32 PM PST	Areal Flood Advisory	MTR	Monterey	3 hr
Dec 13, 7:51 PM PST	Areal Flood Advisory	MTR	City and County of San Francisco, San Mateo	114 min
Dec 13, 8:04 PM PST	Areal Flood Advisory	LOX	Santa Barbara	15 hr
Dec 13, 11:44 PM PST	Areal Flood Advisory	MTR	Monterey	3 hr
Dec 14, 1:19 AM PST	Areal Flood Advisory	LOX	Ventura	6 hr
Dec 14, 4:09 AM PST	Areal Flood Advisory	LOX	Los Angeles	6 hr
Dec 14, 7:34 AM PST	Areal Flood Advisory	SGX	Orange, Riverside	4 hr
Dec 14, 8:09 AM PST	Areal Flood Advisory	SGX	Orange	4 hr
Dec 14, 8:49 AM PST	Areal Flood Advisory	MTR	Monterey	2 hr
Dec 14, 9:23 AM PST	Areal Flood Advisory	SGX	San Bernardino	4 hr
Dec 14, 10:05 AM PST	Areal Flood Advisory	LOX	Ventura	4 hr
Dec 14, 10:12 AM PST	Areal Flood Advisory	LOX	Los Angeles	5 hr
Dec 14, 11:46 AM PST	Areal Flood Advisory	SGX	San Diego	3 hr
Dec 14, 1:00 PM PST	Areal Flood Advisory	SGX	Riverside, San Bernardino	3 hr
Dec 14, 1:15 PM PST	Areal Flood Advisory	SGX	San Diego	3 hr
Dec 14, 2:15 PM PST	Areal Flood Advisory	VEF	San Bernardino	3 hr
Dec 14, 2:25 PM PST	Areal Flood Advisory	VEF	San Bernardino	3 hr
Dec 15, 9:21 PM PST	Areal Flood Advisory	MTR	Marin, Napa, City and County of San Francisco, Sonoma	3 hr
Dec 15, 10:43 PM PST	Areal Flood Advisory	MTR	Alameda, Contra Costa, Marin, City and County of San Francisco, San Mateo	2 hr
Dec 23, 7:00 AM PST	Areal Flood Advisory	MTR	Marin, Sonoma	6 hr
Dec 23, 7:36 AM PST	Areal Flood Advisory	MTR	San Mateo	3 hr
Dec 23, 8:12 AM PST	Areal Flood Advisory	MTR	Alameda, Contra Costa, Marin, Napa, City and County of San Francisco, San Mateo and 1 more	2 hr
Dec 23, 9:56 AM PST	Areal Flood Advisory	MTR	Monterey, San Benito, Santa Clara, Santa Cruz	2 hr
Dec 23, 10:48 AM PST	Areal Flood Advisory	LOX	San Luis Obispo, Santa Barbara	5 hr
Dec 23, 3:33 PM PST	Areal Flood Advisory	SGX	Riverside, San Bernardino	3 hr
Dec 23, 5:29 PM PST	Areal Flood Advisory	SGX	Riverside, San Bernardino	3 hr
Dec 23, 5:43 PM PST	Areal Flood Advisory	LOX	Santa Barbara, Ventura	3 hr
Dec 23, 6:30 PM PST	Areal Flood Advisory	LOX	Los Angeles	2 hr
Dec 23, 8:01 PM PST	Areal Flood Advisory	SGX	Orange	7 hr
Dec 23, 8:20 PM PST	Areal Flood Advisory	SGX	Riverside, San Bernardino	7 hr
Dec 23, 8:54 PM PST	Areal Flood Advisory	LOX	Los Angeles	4 hr
Dec 23, 9:31 PM PST	Areal Flood Advisory	SGX	San Diego	3 hr
Dec 24, 1:55 AM PST	Areal Flood Advisory	MTR	City and County of San Francisco, San Mateo, Santa Clara, Santa Cruz	95 min
Dec 24, 2:26 AM PST	Areal Flood Advisory	SGX	San Diego	3 hr
Dec 24, 5:09 AM PST	Areal Flood Advisory	HNX	Kern	111 min
Dec 24, 7:07 AM PST	Areal Flood Advisory	SGX	Orange, Riverside, San Bernardino, San Diego	2 hr
Dec 24, 7:31 AM PST	Areal Flood Advisory	SGX	San Diego	90 min
Dec 25, 8:37 AM PST	Areal Flood Advisory	MTR	City and County of San Francisco, San Mateo	3 hr
Dec 25, 8:41 AM PST	Areal Flood Advisory	MTR	Alameda, Contra Costa	4 hr
Dec 25, 10:10 AM PST	Areal Flood Advisory	MTR	San Mateo, Santa Clara	2 hr
Dec 25, 10:41 AM PST	Areal Flood Advisory	MTR	Alameda, Contra Costa, San Mateo, Santa Clara	2 hr
Dec 25, 10:44 AM PST	Areal Flood Advisory	MTR	Alameda, San Mateo, Santa Clara, Santa Cruz	2 hr
Dec 25, 11:30 AM PST	Areal Flood Advisory	MTR	Alameda, Santa Clara, Santa Cruz	3 hr
Dec 25, 12:15 PM PST	Areal Flood Advisory	MTR	Alameda, Contra Costa, Santa Clara	2 hr
Dec 25, 2:34 PM PST	Areal Flood Advisory	MTR	Monterey, San Benito, Santa Clara, Santa Cruz	5 hr
Dec 25, 7:00 PM PST	Areal Flood Advisory	LOX	San Luis Obispo, Santa Barbara	3 hr
Dec 25, 9:41 PM PST	Areal Flood Advisory	LOX	Ventura	2 hr
Dec 25, 10:49 PM PST	Areal Flood Advisory	LOX	Los Angeles	3 hr
Dec 26, 12:58 AM PST	Areal Flood Advisory	SGX	Orange, Riverside, San Bernardino	3 hr
Dec 27, 6:02 AM PST	Areal Flood Advisory	MTR	Alameda, Contra Costa, City and County of San Francisco, San Mateo, Santa Clara, Santa Cruz	3 hr
Dec 27, 6:35 AM PST	Areal Flood Advisory	MTR	Alameda, Monterey, San Benito, Santa Clara, Santa Cruz	4 hr
Dec 27, 8:54 AM PST	Areal Flood Advisory	MTR	Monterey, San Benito	3 hr
Dec 29, 1:39 AM PST	Areal Flood Advisory	MTR	City and County of San Francisco, San Mateo	2 hr
Dec 29, 9:57 AM PST	Areal Flood Advisory	MTR	City and County of San Francisco, San Mateo	3 hr
Dec 29, 2:48 PM PST	Areal Flood Advisory	MTR	Santa Clara, Santa Cruz	5 hr
Dec 29, 5:34 PM PST	Areal Flood Advisory	MTR	Alameda, Santa Clara	56 min
Dec 29, 6:31 PM PST	Areal Flood Advisory	MTR	Alameda, Santa Clara	89 min
Dec 29, 11:02 PM PST	Areal Flood Advisory	LOX	Los Angeles, Ventura	6 hr
Dec 30, 4:54 AM PST	Areal Flood Advisory	LOX	Los Angeles, Ventura	6 hr
Dec 30, 10:47 AM PST	Areal Flood Advisory	LOX	Los Angeles, Ventura	4 hr
Dec 30, 11:45 AM PST	Areal Flood Advisory	HNX	Kern	4 hr

By county

Every county with at least one alert. A county page lists each alert that covered it.

17 more counties

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. Warning verification from the Mesonet's Cow. Rebuilt daily.