Alert archive / California / Severe Thunderstorm Warnings / 2026
Severe Thunderstorm Warnings in California, August 2026
27 severe thunderstorm warnings in August 2026. 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 August 2026. Tap one for its archive.
- Severe Thunderstorm Warnings
- 27
- Busiest day
- August 11, 20268 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 |
|---|---|---|---|---|
| Aug 9, 4:13 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 32 min |
| Aug 10, 1:12 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 63 min |
| Aug 10, 2:43 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 47 min |
| Aug 10, 4:36 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 24 min |
| Aug 10, 4:58 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 32 min |
| Aug 10, 5:02 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 43 min |
| Aug 11, 2:11 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 22 min |
| Aug 11, 2:14 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 46 min |
| Aug 11, 3:03 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 59 min |
| Aug 11, 3:25 PM PDT | Severe Thunderstorm Warning | PSR | Riverside, San Bernardino | 50 min |
| Aug 11, 3:36 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 39 min |
| Aug 11, 3:50 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 40 min |
| Aug 11, 4:12 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 48 min |
| Aug 11, 5:42 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 48 min |
| Aug 11, 6:54 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 51 min |
| Aug 12, 2:53 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 52 min |
| Aug 12, 3:47 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 43 min |
| Aug 12, 3:58 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 47 min |
| Aug 12, 4:26 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 49 min |
| Aug 12, 4:58 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 47 min |
| Aug 13, 12:07 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 38 min |
| Aug 13, 12:43 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 47 min |
| Aug 13, 12:44 PM PDT | Severe Thunderstorm Warning | REV | Mono | 46 min |
| Aug 15, 12:45 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 45 min |
| Aug 15, 4:49 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 41 min |
| Aug 15, 5:20 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 13 min |
| Aug 15, 5:42 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 24 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
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. Warning verification from the Mesonet's Cow. Rebuilt daily.