Flash Flood Warnings in California
4,884 flash flood warnings since 1986. 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 since 1986. Tap one for its archive.
- Flash Flood Warnings
- 4,884
- Busiest year
- 2022307 flash flood warnings
- Average year
- 119over 41 years on file
Over time
By year
Before October 2007 these were issued for whole counties, and a storm crossing three counties was often three warnings; since then one polygon follows the storm. The count changed with the practice, not only with the weather.
By month of the year
By county
Every county with at least one alert. A county page lists each alert that covered it.
- San Bernardino County1,499
- Riverside County676
- San Diego County499
- Los Angeles County402
- Inyo County359
- Ventura County220
- Kern County218
- Imperial County190
- Santa Barbara County183
- Orange County109
- Santa Cruz County89
- Mono County81
- Fresno County78
- Monterey County77
- Mariposa County75
- Sonoma County74
- Tulare County72
- Tuolumne County69
- Santa Clara County61
- San Luis Obispo County60
- Madera County59
- Lassen County53
- San Mateo County52
- Plumas County52
- Alpine County50
- Siskiyou County50
- Napa County42
- Marin County40
- Placer County40
- El Dorado County40
- Nevada County39
- Sierra County37
- Alameda County33
- Butte County29
- Amador County29
- Trinity County27
- Tehama County25
- Calaveras County25
- Sacramento County23
- Contra Costa County22
18 more counties
The latest flash flood warnings
The most recent on file, newest first.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 16, 5:52 PM PDT | Flash Flood Warning | VEF | San Bernardino | 4 hr |
| Sep 1, 7:07 PM PDT | Flash Flood Warning | PSR | Imperial | 3 hr |
| Aug 15, 4:46 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 15, 4:16 PM PDT | Flash Flood Warning | PSR | Riverside | 3 hr |
| Aug 15, 3:44 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 13, 1:23 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 12, 8:04 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 12, 6:39 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 12, 6:25 PM PDT | Flash Flood Warning | PSR | Riverside | 5 hr |
| Aug 12, 4:35 PM PDT | Flash Flood Warning | PSR | Imperial | 3 hr |
| Aug 12, 4:01 PM PDT | Flash Flood Warning | PSR | Imperial | 3 hr |
| Aug 12, 4:00 PM PDT | Flash Flood Warning | VEF | San Bernardino | 4 hr |
Nearby
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.