Alert archive / California / Flash Flood Warnings / 2025
Flash Flood Warnings in California, September 2025
46 flash flood warnings in September 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 September 2025. Tap one for its archive.
- Flash Flood Warnings
- 46
- Busiest day
- September 18, 202512 flash flood warnings
Over time
By day
Days in UTC, the clock the archive keeps.
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 |
|---|---|---|---|---|
| Sep 2, 4:15 PM PDT | Flash Flood Warning | LOX | Ventura | 3 hr |
| Sep 3, 3:43 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Sep 4, 1:27 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Sep 4, 3:25 PM PDT | Flash Flood Warning | PSR | Imperial, Riverside | 4 hr |
| Sep 4, 4:43 PM PDT | Flash Flood Warning | VEF | San Bernardino | 4 hr |
| Sep 4, 7:19 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Sep 5, 6:23 AM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Sep 5, 3:36 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Sep 5, 11:51 PM PDT | Flash Flood Warning | 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 | STO | Tehama | 4 hr |
| Sep 17, 2:59 PM PDT | Flash Flood Warning | PSR | Riverside | 3 hr |
| Sep 18, 8:51 AM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Sep 18, 12:36 PM PDT | Flash Flood Warning | PSR | Imperial, Riverside | 7 hr |
| Sep 18, 1:20 PM PDT | Flash Flood Warning | PSR | Imperial, Riverside | 6 hr |
| Sep 18, 2:13 PM PDT | Flash Flood Warning | SGX | San Bernardino | 5 hr |
| Sep 18, 3:38 PM PDT | Flash Flood Warning | 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 | 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 | 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 | PSR | Imperial | 3 hr |
| Sep 18, 6:31 PM PDT | Flash Flood Warning | 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 | VEF | Inyo | 4 hr |
| Sep 22, 2:47 AM PDT | Flash Flood Warning | PSR | Imperial | 4 hr |
| Sep 26, 3:26 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Sep 27, 5:22 AM PDT | Flash Flood Warning | PSR | Imperial, Riverside | 3 hr |
| Sep 27, 8:59 AM PDT | Flash Flood Warning | PSR | Imperial | 3 hr |
| Sep 27, 9:57 AM PDT | Flash Flood Warning | PSR | Imperial | 3 hr |
| Sep 27, 11:08 AM PDT | Flash Flood Warning | PSR | Imperial | 3 hr |
| Sep 27, 12:38 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Sep 27, 1:02 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Sep 27, 1:09 PM PDT | Flash Flood Warning | PSR | Imperial | 3 hr |
| Sep 27, 2:07 PM PDT | Flash Flood Warning | SGX | San Diego | 3 hr |
| Sep 27, 4:22 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Sep 27, 4:58 PM PDT | Flash Flood Warning | PSR | Imperial, Riverside | 3 hr |
| Sep 27, 5:34 PM PDT | Flash Flood Warning | LOX | Los Angeles | 2 hr |
| Sep 27, 6:52 PM PDT | Flash Flood Warning | LOX | Los Angeles | 68 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20242026
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.