Flash Flood Watches in California
710 flash flood watches 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 watches reaches back to 2005.
Flash Flood Watches by county
Each county as a circle sized by its count since 1986. Tap one for its archive.
- Flash Flood Watches
- 710
- Busiest year
- 200862 flash flood watches
- Average year
- 36over 20 years on file
Over time
By year
Before late 2005 the archive holds only tornado, severe thunderstorm, flash flood and marine warnings, and from 1997 SPC's watches, so the jump that year is the archive widening, not 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 County239
- Riverside County165
- San Diego County147
- Los Angeles County80
- Orange County69
- Santa Barbara County50
- Inyo County41
- Monterey County36
- Mono County34
- El Dorado County33
- Marin County32
- Sonoma County32
- Napa County31
- Siskiyou County31
- Placer County31
- Santa Cruz County29
- San Mateo County28
- Santa Clara County28
- Alpine County27
- Nevada County27
- Modoc County23
- Lassen County22
- Plumas County22
- Sierra County22
- San Benito County17
- Imperial County15
- Alameda County14
- Contra Costa County14
- City and County of San Francisco13
- Mendocino County9
- Lake County8
- Tuolumne County7
- Calaveras County7
- Del Norte County6
- Amador County4
- Humboldt County3
- Solano County2
- Trinity County2
- Fresno County2
- Tulare County2
The latest flash flood watches
The most recent on file, newest first.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 13, 2:15 AM PDT | Flash Flood Watch | SGX | Orange, Riverside, San Bernardino, San Diego | 39 hr |
| Feb 10, 1:28 PM PST | Flash Flood Watch | LOX | Los Angeles, Santa Barbara, Ventura | 3 days |
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.