Alert archive / California / Flash Flood Warnings
Flash Flood Warnings in California, 2020
68 flash flood warnings in 2020. 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 2020. Tap one for its archive.
- Flash Flood Warnings
- 68
- Busiest month
- August27 flash flood warnings
- Busiest day
- March 12, 202013 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 |
|---|---|---|---|---|
| Mar 10, 4:56 PM PDT | Flash Flood Warning | LOX | San Luis Obispo | 109 min |
| Mar 10, 5:57 PM PDT | Flash Flood Warning | HNX | Kern | 57 min |
| Mar 10, 6:38 PM PDT | Flash Flood Warning | HNX | Kern | 3 hr |
| Mar 10, 6:50 PM PDT | Flash Flood Warning | PSR | Imperial | 4 hr |
| Mar 10, 8:09 PM PDT | Flash Flood Warning | HNX | Kern | 3 hr |
| Mar 10, 9:39 PM PDT | Flash Flood Warning | HNX | Kern | 111 min |
| Mar 11, 2:57 PM PDT | Flash Flood Warning | HNX | Fresno | 2 hr |
| Mar 12, 11:54 AM PDT | Flash Flood Warning | SGX | San Diego | 3 hr |
| Mar 12, 12:59 PM PDT | Flash Flood Warning | SGX | Riverside | 3 hr |
| Mar 12, 1:32 PM PDT | Flash Flood Warning | PSR | Riverside | 4 hr |
| Mar 12, 2:22 PM PDT | Flash Flood Warning | SGX | Orange, Riverside, San Bernardino | 3 hr |
| Mar 12, 2:45 PM PDT | Flash Flood Warning | PSR | Imperial, Riverside | 4 hr |
| Mar 12, 2:54 PM PDT | Flash Flood Warning | VEF | San Bernardino | 2 hr |
| Mar 12, 3:26 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Mar 12, 3:42 PM PDT | Flash Flood Warning | PSR | Riverside | 4 hr |
| Mar 12, 4:07 PM PDT | Flash Flood Warning | VEF | San Bernardino | 4 hr |
| Mar 12, 4:23 PM PDT | Flash Flood Warning | PSR | Imperial, Riverside | 4 hr |
| Mar 12, 4:32 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Mar 12, 4:42 PM PDT | Flash Flood Warning | PSR | Riverside | 4 hr |
| Mar 12, 4:51 PM PDT | Flash Flood Warning | SGX | San Bernardino | 3 hr |
| Mar 12, 5:01 PM PDT | Flash Flood Warning | PSR | Imperial | 3 hr |
| Mar 12, 5:45 PM PDT | Flash Flood Warning | PSR | Imperial, Riverside | 4 hr |
| Mar 12, 6:48 PM PDT | Flash Flood Warning | PSR | Imperial | 4 hr |
| Mar 16, 1:57 PM PDT | Flash Flood Warning | LOX | Santa Barbara | 93 min |
| Apr 5, 6:53 PM PDT | Flash Flood Warning | HNX | Mariposa, Tuolumne | 4 hr |
| Apr 6, 10:23 AM PDT | Flash Flood Warning | SGX | Orange, Riverside, San Bernardino | 3 hr |
| Apr 8, 9:23 AM PDT | Flash Flood Warning | PSR | Imperial | 4 hr |
| Apr 10, 8:34 AM PDT | Flash Flood Warning | SGX | San Diego | 3 hr |
| Apr 10, 2:29 PM PDT | Flash Flood Warning | SGX | Riverside, San Diego | 5 hr |
| Apr 17, 2:47 PM PDT | Flash Flood Warning | HNX | Mariposa | 3 hr |
| Apr 17, 3:04 PM PDT | Flash Flood Warning | HNX | Mariposa | 3 hr |
| Jun 24, 3:47 PM PDT | Flash Flood Warning | REV | Lassen | 118 min |
| Jun 25, 5:26 PM PDT | Flash Flood Warning | REV | Mono | 3 hr |
| Jul 16, 4:32 PM PDT | Flash Flood Warning | REV | Nevada | 118 min |
| Jul 20, 7:56 PM PDT | Flash Flood Warning | REV | Plumas | 2 hr |
| Jul 21, 4:22 PM PDT | Flash Flood Warning | REV | Plumas | 3 hr |
| Jul 22, 2:56 PM PDT | Flash Flood Warning | REV | Sierra | 3 hr |
| Jul 22, 3:14 PM PDT | Flash Flood Warning | REV | Plumas | 3 hr |
| Jul 22, 3:24 PM PDT | Flash Flood Warning | REV | Lassen | 3 hr |
| Jul 22, 4:31 PM PDT | Flash Flood Warning | REV | Nevada, Placer | 116 min |
| Aug 10, 3:32 PM PDT | Flash Flood Warning | REV | Placer | 3 hr |
| Aug 10, 6:12 PM PDT | Flash Flood Warning | REV | Plumas | 3 hr |
| Aug 11, 12:12 PM PDT | Flash Flood Warning | REV | Mono | 2 hr |
| Aug 15, 1:01 PM PDT | Flash Flood Warning | LOX | Los Angeles | 119 min |
| Aug 15, 2:58 PM PDT | Flash Flood Warning | LOX | Los Angeles | 2 hr |
| Aug 15, 3:24 PM PDT | Flash Flood Warning | PSR | Riverside, San Bernardino | 4 hr |
| Aug 15, 4:11 PM PDT | Flash Flood Warning | HNX | Kern | 51 min |
| Aug 15, 4:16 PM PDT | Flash Flood Warning | HNX | Kern | 119 min |
| Aug 15, 4:23 PM PDT | Flash Flood Warning | HNX | Fresno, Kings | 79 min |
| Aug 15, 4:38 PM PDT | Flash Flood Warning | PSR | Riverside | 4 hr |
| Aug 16, 1:42 PM PDT | Flash Flood Warning | HNX | Kern | 3 hr |
| Aug 16, 4:24 PM PDT | Flash Flood Warning | LOX | Los Angeles | 81 min |
| Aug 16, 4:49 PM PDT | Flash Flood Warning | HNX | Tulare | 90 min |
| Aug 18, 12:50 PM PDT | Flash Flood Warning | SGX | Riverside | 3 hr |
| Aug 18, 1:00 PM PDT | Flash Flood Warning | SGX | San Bernardino | 3 hr |
| Aug 18, 2:10 PM PDT | Flash Flood Warning | SGX | Riverside, San Bernardino | 59 min |
| Aug 18, 3:38 PM PDT | Flash Flood Warning | HNX | Tulare | 92 min |
| Aug 18, 4:21 PM PDT | Flash Flood Warning | HNX | Kern | 114 min |
| Aug 18, 5:15 PM PDT | Flash Flood Warning | LOX | Ventura | 115 min |
| Aug 19, 1:55 PM PDT | Flash Flood Warning | LOX | Los Angeles | 79 min |
| Aug 19, 2:46 PM PDT | Flash Flood Warning | SGX | San Bernardino | 73 min |
| Aug 19, 3:48 PM PDT | Flash Flood Warning | LOX | Los Angeles | 66 min |
| Aug 21, 12:45 PM PDT | Flash Flood Warning | SGX | San Diego | 44 min |
| Aug 22, 2:34 PM PDT | Flash Flood Warning | SGX | San Diego | 76 min |
| Aug 22, 4:07 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 23, 4:01 PM PDT | Flash Flood Warning | HNX | Fresno | 81 min |
| Aug 23, 5:17 PM PDT | Flash Flood Warning | HNX | Fresno | 118 min |
| Nov 7, 9:37 AM PST | Flash Flood Warning | SGX | Riverside, San Bernardino | 38 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Riverside County15
- San Bernardino County13
- Kern County8
- Imperial County7
- San Diego County5
- Los Angeles County5
- Fresno County4
- Plumas County4
- Mariposa County3
- Orange County2
- Lassen County2
- Mono County2
- Nevada County2
- Placer County2
- Tulare County2
- San Luis Obispo County1
- Santa Barbara County1
- Tuolumne County1
- Sierra County1
- Kings County1
- Ventura County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20192021
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.