Alert archive / California / Severe Thunderstorm Warnings / 2025
Severe Thunderstorm Warnings in California, December 2025
18 severe thunderstorm warnings in December 2025. 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 severe thunderstorm warnings reaches back to 1986.
Severe Thunderstorm Warnings by county
Each county as a circle sized by its count in December 2025. Tap one for its archive.
- Severe Thunderstorm Warnings
- 18
- Busiest day
- December 25, 20258 severe thunderstorm 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 |
|---|---|---|---|---|
| Dec 24, 2:43 AM PST | Severe Thunderstorm Warning | MTR | San Mateo, Santa Clara, Santa Cruz | 32 min |
| Dec 24, 3:04 AM PST | Severe Thunderstorm Warning | MTR | Alameda, Santa Clara | 22 min |
| Dec 24, 6:53 AM PST | Severe Thunderstorm Warning | LOX | Los Angeles, Ventura | 97 min |
| Dec 24, 10:15 AM PST | Severe Thunderstorm Warning | LOX | Los Angeles | 30 min |
| Dec 24, 6:06 PM PST | Severe Thunderstorm Warning | MTR | Monterey | 24 min |
| Dec 24, 6:20 PM PST | Severe Thunderstorm Warning | MTR | Monterey | 16 min |
| Dec 25, 2:19 AM PST | Severe Thunderstorm Warning | MTR | City and County of San Francisco, San Mateo | 26 min |
| Dec 25, 2:48 AM PST | Severe Thunderstorm Warning | MTR | San Mateo, Santa Cruz | 27 min |
| Dec 25, 3:12 AM PST | Severe Thunderstorm Warning | MTR | Alameda, San Mateo, Santa Clara, Santa Cruz | 33 min |
| Dec 25, 5:08 AM PST | Severe Thunderstorm Warning | STO | Butte, Plumas, Sierra, Tehama, Yuba | 37 min |
| Dec 25, 8:51 AM PST | Severe Thunderstorm Warning | LOX | Los Angeles | 24 min |
| Dec 25, 2:15 PM PST | Severe Thunderstorm Warning | STO | El Dorado, Placer, Sacramento | 45 min |
| Dec 25, 5:37 PM PST | Severe Thunderstorm Warning | MTR | Marin, City and County of San Francisco | 23 min |
| Dec 25, 6:12 PM PST | Severe Thunderstorm Warning | MTR | Monterey | 33 min |
| Dec 25, 6:35 PM PST | Severe Thunderstorm Warning | MTR | San Mateo, Santa Clara | 8 min |
| Dec 25, 6:54 PM PST | Severe Thunderstorm Warning | MTR | Monterey | 36 min |
| Dec 25, 7:13 PM PST | Severe Thunderstorm Warning | MTR | Monterey | 19 min |
| Dec 25, 7:35 PM PST | Severe Thunderstorm Warning | MTR | Monterey | 25 min |
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 archive20242026
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. Warning verification from the Mesonet's Cow. Rebuilt daily.