Alert archive / California / Red Flag Warnings / 2021
Red Flag Warnings in California, September 2021
18 red flag warnings in September 2021. 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 in September 2021. Tap one for its archive.
- Red Flag Warnings
- 18
- Busiest day
- September 9, 20215 red flag 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 4, 2:30 PM PDT | Red Flag Warning | MFR | Modoc | 30 hr |
| Sep 6, 2:00 PM PDT | Red Flag Warning | MFR | Modoc, Siskiyou | 30 hr |
| Sep 8, 8:42 PM PDT | Red Flag Warning | MFR | Modoc, Siskiyou | 44 hr |
| Sep 9, 3:53 AM PDT | Red Flag Warning | EKA | 25 hr | |
| Sep 9, 9:30 AM PDT | Red Flag Warning | MTR | Alameda, Contra Costa, Marin, Napa, Sonoma | 23 hr |
| Sep 9, 9:48 AM PDT | Red Flag Warning | STO | 37 hr | |
| Sep 9, 10:33 AM PDT | Red Flag Warning | REV | El Dorado, Lassen, Nevada, Placer, Plumas, Sierra | 36 hr |
| Sep 12, 1:56 PM PDT | Red Flag Warning | MFR | Siskiyou | 41 hr |
| Sep 13, 3:39 AM PDT | Red Flag Warning | EKA | 26 hr | |
| Sep 17, 11:35 AM PDT | Red Flag Warning | REV | Lassen, Modoc | 32 hr |
| Sep 17, 4:47 PM PDT | Red Flag Warning | HNX | Fresno, Kern, Tulare | 51 hr |
| Sep 19, 9:46 AM PDT | Red Flag Warning | MTR | Alameda, Contra Costa | 34 hr |
| Sep 19, 10:21 AM PDT | Red Flag Warning | EKA | 40 hr | |
| Sep 19, 10:58 AM PDT | Red Flag Warning | STO | 45 hr | |
| Sep 25, 2:12 PM PDT | Red Flag Warning | MFR | Modoc | 29 hr |
| Sep 26, 9:28 AM PDT | Red Flag Warning | REV | El Dorado, Lassen, Madera, Modoc, Mono, Nevada and 3 more | 42 hr |
| Sep 28, 2:50 AM PDT | Red Flag Warning | STO | 17 hr | |
| Sep 29, 10:27 AM PDT | Red Flag Warning | MTR | 22 hr |
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 archive20202022
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.