Alert archive / California / Flash Flood Warnings
Flash Flood Warnings in California, 2017
258 flash flood warnings in 2017. 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 2017. Tap one for its archive.
- Flash Flood Warnings
- 258
- Busiest month
- January63 flash flood warnings
- Busiest day
- August 3, 201722 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 4, 1:08 AM PST | Flash Flood Warning | MTR | Santa Cruz | 3 hr |
| Jan 4, 3:41 AM PST | Flash Flood Warning | MTR | Sonoma | 4 hr |
| Jan 4, 3:53 AM PST | Flash Flood Warning | MTR | Santa Cruz | 3 hr |
| Jan 4, 4:40 AM PST | Flash Flood Warning | MTR | Monterey | 6 hr |
| Jan 4, 3:30 PM PST | Flash Flood Warning | MTR | Santa Clara | 2 hr |
| Jan 5, 7:10 AM PST | Flash Flood Warning | HNX | Kern, Tulare | 6 hr |
| Jan 7, 12:57 PM PST | Flash Flood Warning | HNX | Fresno, Tulare | 63 min |
| Jan 7, 2:17 PM PST | Flash Flood Warning | HNX | Fresno, Tulare | 58 min |
| Jan 7, 3:34 PM PST | Flash Flood Warning | HNX | Kern | 56 min |
| Jan 7, 4:24 PM PST | Flash Flood Warning | HNX | Tulare | 3 hr |
| Jan 7, 4:37 PM PST | Flash Flood Warning | HNX | Kern | 53 min |
| Jan 7, 7:27 PM PST | Flash Flood Warning | HNX | Tulare | 3 hr |
| Jan 8, 12:16 AM PST | Flash Flood Warning | MTR | Santa Clara | 6 hr |
| Jan 8, 4:23 AM PST | Flash Flood Warning | MTR | Sonoma | 6 hr |
| Jan 8, 5:25 AM PST | Flash Flood Warning | MTR | Sonoma | 6 hr |
| Jan 8, 10:49 AM PST | Flash Flood Warning | MTR | Sonoma | 6 hr |
| Jan 8, 11:11 AM PST | Flash Flood Warning | MTR | Sonoma | 6 hr |
| Jan 8, 1:44 PM PST | Flash Flood Warning | MTR | Monterey | 4 hr |
| Jan 8, 1:58 PM PST | Flash Flood Warning | MTR | Santa Cruz | 3 hr |
| Jan 8, 4:34 PM PST | Flash Flood Warning | MTR | Santa Clara | 3 hr |
| Jan 8, 4:57 PM PST | Flash Flood Warning | LOX | San Luis Obispo | 4 hr |
| Jan 8, 11:09 PM PST | Flash Flood Warning | MTR | Monterey | 3 hr |
| Jan 9, 12:06 AM PST | Flash Flood Warning | HNX | Kern, Tulare | 3 hr |
| Jan 9, 1:01 AM PST | Flash Flood Warning | HNX | Fresno | 3 hr |
| Jan 9, 1:34 AM PST | Flash Flood Warning | HNX | Kern | 3 hr |
| Jan 9, 3:52 AM PST | Flash Flood Warning | HNX | Kern | 3 hr |
| Jan 10, 12:18 PM PST | Flash Flood Warning | MTR | Sonoma | 6 hr |
| Jan 10, 12:40 PM PST | Flash Flood Warning | MTR | Santa Clara | 6 hr |
| Jan 10, 2:08 PM PST | Flash Flood Warning | MTR | Napa | 6 hr |
| Jan 10, 2:27 PM PST | Flash Flood Warning | MTR | Marin | 6 hr |
| Jan 10, 7:26 PM PST | Flash Flood Warning | MTR | Santa Cruz | 3 hr |
| Jan 10, 8:01 PM PST | Flash Flood Warning | MTR | Alameda | 10 hr |
| Jan 10, 9:14 PM PST | Flash Flood Warning | MTR | Monterey | 9 hr |
| Jan 10, 10:53 PM PST | Flash Flood Warning | MTR | Santa Cruz | 6 hr |
| Jan 11, 6:03 AM PST | Flash Flood Warning | MTR | Monterey | 3 hr |
| Jan 12, 1:02 PM PST | Flash Flood Warning | LOX | Los Angeles | 3 hr |
| Jan 12, 1:14 PM PST | Flash Flood Warning | HNX | Fresno, Madera | 3 hr |
| Jan 18, 8:15 PM PST | Flash Flood Warning | MTR | Sonoma | 4 hr |
| Jan 18, 9:12 PM PST | Flash Flood Warning | MTR | Alameda | 2 hr |
| Jan 19, 12:16 AM PST | Flash Flood Warning | MTR | Sonoma | 3 hr |
| Jan 20, 4:49 AM PST | Flash Flood Warning | MTR | Sonoma | 4 hr |
| Jan 20, 6:38 AM PST | Flash Flood Warning | MTR | Santa Cruz | 6 hr |
| Jan 20, 7:08 AM PST | Flash Flood Warning | MTR | Santa Clara | 6 hr |
| Jan 20, 8:53 AM PST | Flash Flood Warning | LOX | Santa Barbara | 4 hr |
| Jan 20, 10:34 AM PST | Flash Flood Warning | LOX | Ventura | 3 hr |
| Jan 20, 11:56 AM PST | Flash Flood Warning | HNX | Kern | 64 min |
| Jan 20, 12:11 PM PST | Flash Flood Warning | LOX | Los Angeles | 109 min |
| Jan 20, 12:20 PM PST | Flash Flood Warning | MTR | San Benito | 4 hr |
| Jan 20, 12:21 PM PST | Flash Flood Warning | HNX | Kern, Tulare | 2 hr |
| Jan 20, 12:41 PM PST | Flash Flood Warning | LOX | Los Angeles | 3 hr |
| Jan 20, 1:33 PM PST | Flash Flood Warning | SGX | San Bernardino | 5 hr |
| Jan 20, 2:38 PM PST | Flash Flood Warning | SGX | San Diego | 3 hr |
| Jan 20, 2:59 PM PST | Flash Flood Warning | SGX | San Diego | 6 hr |
| Jan 22, 5:11 AM PST | Flash Flood Warning | MTR | Napa, Sonoma | 4 hr |
| Jan 22, 6:28 AM PST | Flash Flood Warning | MTR | Santa Cruz | 4 hr |
| Jan 22, 8:08 AM PST | Flash Flood Warning | MTR | Monterey | 3 hr |
| Jan 22, 8:12 AM PST | Flash Flood Warning | MTR | Santa Clara | 3 hr |
| Jan 22, 8:35 AM PST | Flash Flood Warning | MTR | Santa Cruz | 3 hr |
| Jan 22, 12:35 PM PST | Flash Flood Warning | MTR | San Benito, Santa Clara | 6 hr |
| Jan 22, 2:36 PM PST | Flash Flood Warning | SGX | Orange, Riverside, San Bernardino | 3 hr |
| Jan 22, 2:39 PM PST | Flash Flood Warning | LOX | Los Angeles | 111 min |
| Jan 22, 4:14 PM PST | Flash Flood Warning | SGX | San Diego | 3 hr |
| Jan 22, 4:39 PM PST | Flash Flood Warning | MTR | Monterey | 3 hr |
| Feb 3, 11:38 AM PST | Flash Flood Warning | HNX | Mariposa | 3 hr |
| Feb 7, 7:09 AM PST | Flash Flood Warning | MTR | Marin | 4 hr |
| Feb 7, 7:15 AM PST | Flash Flood Warning | MTR | Napa | 6 hr |
| Feb 7, 7:34 AM PST | Flash Flood Warning | MTR | Santa Cruz | 8 hr |
| Feb 7, 9:33 AM PST | Flash Flood Warning | MTR | Alameda | 8 hr |
| Feb 7, 9:55 AM PST | Flash Flood Warning | MTR | Santa Clara | 8 hr |
| Feb 7, 10:22 AM PST | Flash Flood Warning | MTR | San Benito, Santa Clara | 12 hr |
| Feb 7, 10:47 AM PST | Flash Flood Warning | MTR | San Mateo, Santa Clara | 3 hr |
| Feb 7, 11:30 AM PST | Flash Flood Warning | MTR | Santa Cruz | 6 hr |
| Feb 7, 11:56 AM PST | Flash Flood Warning | HNX | Fresno, Madera, Mariposa, Merced, Tulare, Tuolumne | 109 min |
| Feb 7, 11:59 AM PST | Flash Flood Warning | MTR | Monterey | 4 hr |
| Feb 7, 1:49 PM PST | Flash Flood Warning | HNX | Fresno, Madera, Mariposa, Merced, Tulare, Tuolumne | 3 hr |
| Feb 7, 2:44 PM PST | Flash Flood Warning | HNX | Madera | 24 hr |
| Feb 7, 4:08 PM PST | Flash Flood Warning | HNX | Tulare | 112 min |
| Feb 7, 5:27 PM PST | Flash Flood Warning | MTR | Alameda | 2 hr |
| Feb 9, 11:41 AM PST | Flash Flood Warning | MTR | Marin, Sonoma | 7 hr |
| Feb 9, 12:15 PM PST | Flash Flood Warning | MTR | Marin | 6 hr |
| Feb 9, 12:27 PM PST | Flash Flood Warning | MTR | Sonoma | 6 hr |
| Feb 9, 12:40 PM PST | Flash Flood Warning | MTR | Sonoma | 5 hr |
| Feb 9, 1:21 PM PST | Flash Flood Warning | MTR | Napa | 5 hr |
| Feb 10, 10:18 PM PST | Flash Flood Warning | HNX | Mariposa, Merced | 28 hr |
| Feb 11, 2:08 PM PST | Flash Flood Warning | HNX | Kern | 67 min |
| Feb 11, 2:34 PM PST | Flash Flood Warning | LOX | Los Angeles | 3 hr |
| Feb 12, 2:12 AM PST | Flash Flood Warning | HNX | Mariposa, Merced | 8 hr |
| Feb 12, 4:35 PM PST | Flash Flood Warning | STO | Butte | 46 hr |
| Feb 17, 12:33 PM PST | Flash Flood Warning | LOX | Santa Barbara | 3 hr |
| Feb 17, 1:16 PM PST | Flash Flood Warning | LOX | Ventura | 3 hr |
| Feb 17, 1:51 PM PST | Flash Flood Warning | HNX | Kern | 6 hr |
| Feb 17, 2:23 PM PST | Flash Flood Warning | LOX | Los Angeles | 3 hr |
| Feb 17, 3:33 PM PST | Flash Flood Warning | HNX | Kern | 6 hr |
| Feb 17, 3:56 PM PST | Flash Flood Warning | LOX | Ventura | 3 hr |
| Feb 17, 4:16 PM PST | Flash Flood Warning | HNX | Kern | 3 hr |
| Feb 17, 5:02 PM PST | Flash Flood Warning | LOX | Ventura | 5 hr |
| Feb 17, 5:10 PM PST | Flash Flood Warning | LOX | Los Angeles | 3 hr |
| Feb 17, 5:12 PM PST | Flash Flood Warning | SGX | Orange, Riverside, San Bernardino | 4 hr |
| Feb 17, 6:21 PM PST | Flash Flood Warning | SGX | San Bernardino | 4 hr |
| Feb 17, 7:03 PM PST | Flash Flood Warning | HNX | Kern | 2 hr |
| Feb 20, 4:23 AM PST | Flash Flood Warning | MTR | Monterey | 3 hr |
| Feb 20, 7:07 AM PST | Flash Flood Warning | MTR | Monterey | 6 hr |
| Feb 20, 7:40 AM PST | Flash Flood Warning | MTR | Santa Cruz | 6 hr |
| Feb 20, 8:14 AM PST | Flash Flood Warning | MTR | Marin, Sonoma | 4 hr |
| Feb 20, 8:56 AM PST | Flash Flood Warning | MTR | San Benito | 6 hr |
| Feb 20, 9:04 AM PST | Flash Flood Warning | MTR | Santa Cruz | 6 hr |
| Feb 20, 10:13 AM PST | Flash Flood Warning | MTR | San Benito, Santa Clara | 6 hr |
| Feb 20, 10:26 AM PST | Flash Flood Warning | MTR | Alameda | 6 hr |
| Feb 20, 4:13 PM PST | Flash Flood Warning | MTR | San Benito, Santa Clara | 6 hr |
| Feb 20, 4:34 PM PST | Flash Flood Warning | MTR | Alameda | 116 min |
| Feb 20, 5:03 PM PST | Flash Flood Warning | MTR | Santa Clara | 87 min |
| Feb 20, 5:29 PM PST | Flash Flood Warning | MTR | San Mateo | 2 hr |
| Feb 20, 6:02 PM PST | Flash Flood Warning | MTR | Santa Cruz | 4 hr |
| Feb 20, 6:36 PM PST | Flash Flood Warning | MTR | Alameda | 4 hr |
| Feb 20, 6:54 PM PST | Flash Flood Warning | MTR | Alameda | 3 hr |
| Feb 20, 7:17 PM PST | Flash Flood Warning | MTR | San Mateo | 3 hr |
| Feb 20, 7:45 PM PST | Flash Flood Warning | STO | San Joaquin | 12 hr |
| Feb 20, 10:00 PM PST | Flash Flood Warning | MTR | Santa Cruz | 4 hr |
| Feb 20, 10:01 PM PST | Flash Flood Warning | MTR | Alameda | 3 hr |
| Feb 20, 10:15 PM PST | Flash Flood Warning | MTR | San Mateo | 3 hr |
| Mar 22, 7:42 PM PDT | Flash Flood Warning | LOX | Los Angeles | 93 min |
| Jun 19, 7:14 PM PDT | Flash Flood Warning | MFR | Modoc, Siskiyou | 3 hr |
| Jun 19, 7:50 PM PDT | Flash Flood Warning | MFR | Modoc, Siskiyou | 2 hr |
| Jun 25, 5:34 PM PDT | Flash Flood Warning | MFR | Siskiyou | 86 min |
| Jul 9, 3:01 PM PDT | Flash Flood Warning | LOX | Ventura | 3 hr |
| Jul 9, 3:02 PM PDT | Flash Flood Warning | HNX | Kern | 118 min |
| Jul 9, 5:43 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Jul 10, 3:02 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Jul 10, 4:49 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Jul 18, 6:01 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Jul 19, 7:53 AM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Jul 19, 8:53 AM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Jul 19, 9:57 AM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Jul 23, 3:17 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Jul 24, 12:31 PM PDT | Flash Flood Warning | VEF | Inyo, San Bernardino | 4 hr |
| Jul 24, 2:28 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Jul 24, 4:09 PM PDT | Flash Flood Warning | VEF | Inyo, San Bernardino | 3 hr |
| Jul 24, 4:31 PM PDT | Flash Flood Warning | VEF | San Bernardino | 119 min |
| Jul 24, 6:30 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Jul 24, 6:54 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Jul 24, 7:40 PM PDT | Flash Flood Warning | VEF | San Bernardino | 2 hr |
| Jul 24, 7:45 PM PDT | Flash Flood Warning | PSR | Riverside, San Bernardino | 3 hr |
| Jul 25, 11:06 AM PDT | Flash Flood Warning | VEF | San Bernardino | 6 hr |
| Jul 25, 11:39 AM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Jul 25, 1:28 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Jul 25, 1:51 PM PDT | Flash Flood Warning | SGX | San Diego | 4 hr |
| Jul 25, 4:07 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Jul 26, 11:47 AM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Jul 29, 1:48 PM PDT | Flash Flood Warning | REV | Alpine | 117 min |
| Jul 29, 2:53 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Jul 29, 3:02 PM PDT | Flash Flood Warning | PSR | San Bernardino | 3 hr |
| Jul 29, 3:51 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Jul 30, 2:03 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 1, 1:27 PM PDT | Flash Flood Warning | SGX | San Diego | 3 hr |
| Aug 1, 3:02 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Aug 1, 3:42 PM PDT | Flash Flood Warning | SGX | Orange, Riverside | 3 hr |
| Aug 1, 4:15 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Aug 1, 6:16 PM PDT | Flash Flood Warning | LOX | Los Angeles | 119 min |
| Aug 2, 1:07 PM PDT | Flash Flood Warning | SGX | Riverside, San Diego | 3 hr |
| Aug 2, 2:25 PM PDT | Flash Flood Warning | SGX | San Diego | 3 hr |
| Aug 2, 2:49 PM PDT | Flash Flood Warning | HNX | Madera, Mariposa | 86 min |
| Aug 2, 4:11 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Aug 2, 4:13 PM PDT | Flash Flood Warning | PSR | Imperial | 3 hr |
| Aug 2, 5:53 PM PDT | Flash Flood Warning | VEF | Inyo | 2 hr |
| Aug 2, 6:16 PM PDT | Flash Flood Warning | REV | Plumas | 119 min |
| Aug 2, 7:36 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Aug 2, 8:09 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 2, 8:19 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 2, 10:04 PM PDT | Flash Flood Warning | VEF | Inyo, San Bernardino | 3 hr |
| Aug 3, 2:52 AM PDT | Flash Flood Warning | SGX | Riverside | 3 hr |
| Aug 3, 5:19 AM PDT | Flash Flood Warning | PSR | Riverside | 3 hr |
| Aug 3, 6:02 AM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 3, 7:07 AM PDT | Flash Flood Warning | PSR | San Bernardino | 5 hr |
| Aug 3, 7:41 AM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 3, 8:13 AM PDT | Flash Flood Warning | PSR | Riverside | 3 hr |
| Aug 3, 8:59 AM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 3, 11:59 AM PDT | Flash Flood Warning | SGX | San Diego | 3 hr |
| Aug 3, 12:35 PM PDT | Flash Flood Warning | PSR | Riverside, San Bernardino | 3 hr |
| Aug 3, 1:02 PM PDT | Flash Flood Warning | HNX | Kern | 3 hr |
| Aug 3, 1:19 PM PDT | Flash Flood Warning | SGX | San Diego | 3 hr |
| Aug 3, 1:44 PM PDT | Flash Flood Warning | PSR | Riverside | 3 hr |
| Aug 3, 2:00 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 3, 2:10 PM PDT | Flash Flood Warning | SGX | San Bernardino | 3 hr |
| Aug 3, 2:58 PM PDT | Flash Flood Warning | LOX | Los Angeles, Ventura | 3 hr |
| Aug 3, 3:41 PM PDT | Flash Flood Warning | LOX | Los Angeles | 94 min |
| Aug 3, 5:01 PM PDT | Flash Flood Warning | PSR | Imperial | 3 hr |
| Aug 4, 3:28 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Aug 4, 4:46 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Aug 4, 5:41 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 5, 4:00 PM PDT | Flash Flood Warning | HNX | Madera, Mariposa, Tuolumne | 90 min |
| Aug 6, 1:50 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Aug 6, 2:51 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Aug 7, 4:46 PM PDT | Flash Flood Warning | REV | Nevada, Sierra | 119 min |
| Aug 8, 6:15 PM PDT | Flash Flood Warning | REV | Plumas | 3 hr |
| Aug 10, 4:47 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 11, 1:56 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 11, 2:47 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 11, 3:51 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 11, 5:32 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 12, 1:31 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 12, 4:49 PM PDT | Flash Flood Warning | SGX | San Diego | 3 hr |
| Aug 12, 5:20 PM PDT | Flash Flood Warning | SGX | San Diego | 3 hr |
| Aug 18, 5:11 PM PDT | Flash Flood Warning | HNX | Fresno | 3 hr |
| Aug 18, 5:21 PM PDT | Flash Flood Warning | REV | Nevada, Sierra | 3 hr |
| Aug 21, 5:30 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Aug 23, 12:53 PM PDT | Flash Flood Warning | VEF | San Bernardino | 6 hr |
| Aug 31, 3:58 PM PDT | Flash Flood Warning | SGX | Riverside, San Bernardino | 3 hr |
| Aug 31, 4:08 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Sep 3, 2:08 PM PDT | Flash Flood Warning | LOX | Santa Barbara, Ventura | 2 hr |
| Sep 3, 3:15 PM PDT | Flash Flood Warning | LOX | Los Angeles | 3 hr |
| Sep 3, 3:18 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Sep 3, 3:32 PM PDT | Flash Flood Warning | HNX | Madera, Mariposa, Tuolumne | 58 min |
| Sep 3, 3:34 PM PDT | Flash Flood Warning | HNX | Kern | 56 min |
| Sep 3, 3:41 PM PDT | Flash Flood Warning | SGX | San Bernardino | 3 hr |
| Sep 3, 3:58 PM PDT | Flash Flood Warning | LOX | San Luis Obispo, Santa Barbara | 4 hr |
| Sep 3, 4:24 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Sep 3, 4:33 PM PDT | Flash Flood Warning | HNX | Kern | 57 min |
| Sep 3, 4:40 PM PDT | Flash Flood Warning | HNX | Kern | 2 hr |
| Sep 3, 5:34 PM PDT | Flash Flood Warning | HNX | Kern | 56 min |
| Sep 6, 4:28 PM PDT | Flash Flood Warning | PSR | Riverside | 3 hr |
| Sep 7, 2:14 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Sep 7, 5:01 PM PDT | Flash Flood Warning | SGX | San Diego | 3 hr |
| Sep 7, 6:44 PM PDT | Flash Flood Warning | PSR | Imperial, Riverside | 3 hr |
| Sep 8, 12:18 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Sep 8, 12:29 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Sep 8, 1:24 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Sep 8, 2:16 PM PDT | Flash Flood Warning | PSR | Imperial | 3 hr |
| Sep 8, 2:36 PM PDT | Flash Flood Warning | PSR | Riverside | 3 hr |
| Sep 8, 3:16 PM PDT | Flash Flood Warning | PSR | Riverside | 3 hr |
| Sep 8, 3:22 PM PDT | Flash Flood Warning | VEF | San Bernardino | 6 hr |
| Sep 8, 3:38 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Sep 8, 4:00 PM PDT | Flash Flood Warning | PSR | Riverside | 3 hr |
| Sep 8, 4:02 PM PDT | Flash Flood Warning | VEF | San Bernardino | 4 hr |
| Sep 8, 4:51 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Sep 8, 5:33 PM PDT | Flash Flood Warning | SGX | Riverside | 3 hr |
| Sep 9, 9:37 AM PDT | Flash Flood Warning | PSR | Imperial | 3 hr |
| Sep 9, 9:50 AM PDT | Flash Flood Warning | VEF | San Bernardino | 4 hr |
| Sep 9, 11:14 AM PDT | Flash Flood Warning | PSR | Riverside | 3 hr |
| Sep 9, 12:16 PM PDT | Flash Flood Warning | VEF | San Bernardino | 4 hr |
| Sep 9, 12:19 PM PDT | Flash Flood Warning | PSR | Riverside | 3 hr |
| Sep 9, 12:38 PM PDT | Flash Flood Warning | VEF | San Bernardino | 5 hr |
| Sep 9, 12:53 PM PDT | Flash Flood Warning | PSR | Riverside, San Bernardino | 3 hr |
| Sep 9, 1:47 PM PDT | Flash Flood Warning | VEF | San Bernardino | 4 hr |
| Sep 9, 2:17 PM PDT | Flash Flood Warning | VEF | Inyo | 4 hr |
| Sep 9, 3:42 PM PDT | Flash Flood Warning | HNX | Kern | 93 min |
| Sep 9, 3:49 PM PDT | Flash Flood Warning | SGX | Riverside | 3 hr |
| Sep 9, 4:29 PM PDT | Flash Flood Warning | HNX | Kern | 91 min |
| Sep 9, 5:22 PM PDT | Flash Flood Warning | HNX | Kern | 53 min |
| Sep 10, 4:03 PM PDT | Flash Flood Warning | LOX | Santa Barbara | 3 hr |
| Sep 10, 4:15 PM PDT | Flash Flood Warning | LOX | San Luis Obispo, Santa Barbara | 3 hr |
| Sep 10, 6:06 PM PDT | Flash Flood Warning | HNX | Kern | 54 min |
| Sep 10, 6:06 PM PDT | Flash Flood Warning | LOX | San Luis Obispo, Santa Barbara, Ventura | 3 hr |
| Sep 10, 7:20 PM PDT | Flash Flood Warning | LOX | San Luis Obispo, Santa Barbara | 55 min |
| Sep 10, 10:40 PM PDT | Flash Flood Warning | HNX | Kern | 3 hr |
| Sep 11, 6:18 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Sep 12, 4:39 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Sep 13, 4:41 PM PDT | Flash Flood Warning | HNX | Tuolumne | 2 hr |
| Sep 13, 5:36 PM PDT | Flash Flood Warning | REV | Lassen | 3 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- San Bernardino County55
- Inyo County26
- Kern County24
- Riverside County21
- Santa Cruz County14
- Sonoma County14
- Santa Clara County13
- Los Angeles County12
- San Diego County12
- Monterey County10
- Tulare County10
- Alameda County9
- Santa Barbara County8
- Ventura County8
- Mariposa County8
- Fresno County7
- Madera County7
- San Benito County6
- San Luis Obispo County5
- Marin County5
- Tuolumne County5
- Imperial County5
- Napa County4
- San Mateo County4
- Merced County4
- Orange County3
- Siskiyou County3
- Modoc County2
- Plumas County2
- Nevada County2
- Sierra County2
- Butte County1
- San Joaquin County1
- Alpine County1
- Lassen County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20162018
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.