Red Flag Warnings in California
1,794 red flag 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 red flag warnings reaches back to 2005.
Red Flag Warnings by county
Each county as a circle sized by its count since 1986. Tap one for its archive.
- Red Flag Warnings
- 1,794
- Busiest year
- 2007140 red flag warnings
- Average year
- 85over 21 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.
- Modoc County431
- San Bernardino County310
- Siskiyou County251
- Riverside County244
- Lassen County168
- Los Angeles County143
- San Diego County116
- Sierra County113
- Imperial County112
- Orange County102
- Nevada County95
- Placer County95
- El Dorado County94
- Tulare County88
- Inyo County80
- Plumas County77
- Madera County55
- Mono County43
- San Mateo County40
- Santa Clara County40
- Santa Cruz County40
- Monterey County32
- Kern County32
- Santa Barbara County31
- Alameda County29
- Contra Costa County29
- Napa County28
- San Benito County28
- Sonoma County28
- Ventura County28
- Marin County24
- Fresno County16
- Mariposa County12
- San Luis Obispo County10
- Tuolumne County9
- Kings County8
- Merced County8
- City and County of San Francisco7
- Shasta County4
- Humboldt County3
The latest red flag warnings
The most recent on file, newest first.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 11, 10:18 AM PDT | Red Flag Warning | REV | Lassen, Madera, Modoc, Mono | 38 hr |
| Sep 11, 10:09 AM PDT | Red Flag Warning | EKA | Lake | 40 hr |
| Sep 11, 10:02 AM PDT | Red Flag Warning | STO | Butte, Colusa, Glenn, Nevada, Placer, Plumas and 4 more | 3 days |
| Sep 6, 10:40 AM PDT | Red Flag Warning | REV | Madera, Mono | 9 hr |
| Aug 31, 11:42 AM PDT | Red Flag Warning | REV | Lassen, Modoc | 35 hr |
| Aug 30, 12:56 PM PDT | Red Flag Warning | MFR | Modoc, Siskiyou | 31 hr |
| Aug 27, 1:33 PM PDT | Red Flag Warning | LOX | San Luis Obispo | 25 hr |
| Aug 27, 11:07 AM PDT | Red Flag Warning | MTR | Monterey, San Benito, San Mateo, Santa Clara, Santa Cruz | 28 hr |
| Aug 26, 10:12 AM PDT | Red Flag Warning | MFR | Modoc | 34 hr |
| Aug 25, 12:48 PM PDT | Red Flag Warning | MFR | Modoc | 31 hr |
| Aug 24, 1:46 PM PDT | Red Flag Warning | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 4 days |
| Aug 23, 11:59 AM PDT | Red Flag Warning | MFR | Siskiyou | 32 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.