River Flood Warnings in California
461 river 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 river flood warnings reaches back to 2005.
River Flood Warnings by county
Each county as a circle sized by its count since 1986. Tap one for its archive.
- River Flood Warnings
- 461
- Busiest year
- 2017118 river flood warnings
- Average year
- 26over 18 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.
- Mendocino County76
- Tehama County71
- Humboldt County42
- Butte County31
- Glenn County31
- San Diego County28
- Mariposa County26
- Napa County21
- Monterey County18
- Sacramento County18
- Merced County14
- Yolo County14
- Sonoma County13
- El Dorado County13
- Amador County13
- Mono County10
- Santa Clara County10
- San Joaquin County10
- Del Norte County9
- Plumas County8
- Ventura County8
- Solano County7
- Nevada County7
- Placer County7
- Alpine County7
- Stanislaus County6
- Modoc County6
- San Bernardino County4
- Siskiyou County4
- Lassen County4
- Lake County3
- Santa Cruz County3
- Santa Barbara County2
- San Benito County2
- San Luis Obispo County1
The latest river flood warnings
The most recent on file, newest first.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 25, 9:00 AM PST | River Flood Warning | STO | Butte, Glenn | 29 hr |
| Feb 24, 7:47 PM PST | River Flood Warning | STO | Tehama | 37 hr |
| Feb 24, 7:47 PM PST | River Flood Warning | STO | Tehama | 38 hr |
| Feb 24, 7:46 PM PST | River Flood Warning | EKA | Mendocino | 21 hr |
| Feb 24, 8:49 AM PST | River Flood Warning | EKA | Humboldt | 35 hr |
| Feb 24, 7:59 AM PST | River Flood Warning | EKA | Mendocino | 36 hr |
| Jan 6, 2:08 PM PST | River Flood Warning | STO | Butte, Glenn | 13 hr |
| Jan 6, 6:49 AM PST | River Flood Warning | STO | Tehama | 7 hr |
| Jan 5, 12:22 PM PST | River Flood Warning | EKA | Mendocino | 23 hr |
| Jan 5, 12:16 PM PST | River Flood Warning | EKA | Mendocino | 14 hr |
| Jan 1, 10:05 AM PST | River Flood Warning | SGX | San Diego | 23 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.