Alert archive / California / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in California, 2011
118 severe thunderstorm warnings in 2011. 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 2011. Tap one for its archive.
- Severe Thunderstorm Warnings
- 118
- Busiest month
- September45 severe thunderstorm warnings
- Busiest day
- September 13, 201118 severe thunderstorm warnings
Over time
By month
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 |
|---|---|---|---|---|
| Feb 18, 10:05 PM PST | Severe Thunderstorm Warning | LOX | San Luis Obispo, Santa Barbara | 55 min |
| Feb 25, 3:00 PM PST | Severe Thunderstorm Warning | STO | Sacramento | 27 min |
| Mar 13, 2:27 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 25 min |
| Mar 20, 2:59 PM PDT | Severe Thunderstorm Warning | LOX | Los Angeles, Ventura | 61 min |
| Mar 20, 7:13 PM PDT | Severe Thunderstorm Warning | SGX | Orange | 47 min |
| Mar 21, 2:59 PM PDT | Severe Thunderstorm Warning | STO | Colusa, Glenn | 61 min |
| Mar 23, 5:08 PM PDT | Severe Thunderstorm Warning | STO | Butte, Colusa, Sutter, Yuba | 52 min |
| Mar 23, 6:02 PM PDT | Severe Thunderstorm Warning | STO | Sutter, Yuba | 28 min |
| Apr 7, 4:37 PM PDT | Severe Thunderstorm Warning | STO | Solano | 38 min |
| May 17, 5:08 PM PDT | Severe Thunderstorm Warning | STO | Tehama | 37 min |
| Jun 5, 8:45 PM PDT | Severe Thunderstorm Warning | STO | Calaveras, Tuolumne | 29 min |
| Jun 15, 9:33 PM PDT | Severe Thunderstorm Warning | VEF | Inyo | 42 min |
| Jun 15, 10:04 PM PDT | Severe Thunderstorm Warning | VEF | Inyo | 56 min |
| Jul 3, 9:59 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 46 min |
| Jul 3, 10:18 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 42 min |
| Jul 4, 3:55 PM PDT | Severe Thunderstorm Warning | LOX | Los Angeles, Ventura | 65 min |
| Jul 4, 4:41 PM PDT | Severe Thunderstorm Warning | LOX | Los Angeles | 64 min |
| Jul 5, 1:43 PM PDT | Severe Thunderstorm Warning | PSR | Riverside, San Bernardino | 51 min |
| Jul 5, 2:01 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 33 min |
| Jul 5, 2:06 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 24 min |
| Jul 5, 2:09 PM PDT | Severe Thunderstorm Warning | STO | Alpine, Amador, Calaveras, Tuolumne | 34 min |
| Jul 5, 2:13 PM PDT | Severe Thunderstorm Warning | STO | Alpine, Amador, Calaveras, Tuolumne | 31 min |
| Jul 5, 2:34 PM PDT | Severe Thunderstorm Warning | STO | Alpine, Amador, El Dorado | 26 min |
| Jul 5, 3:11 PM PDT | Severe Thunderstorm Warning | STO | Alpine, Amador, El Dorado | 49 min |
| Jul 5, 4:33 PM PDT | Severe Thunderstorm Warning | REV | Plumas, Sierra | 42 min |
| Jul 5, 5:12 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 48 min |
| Jul 5, 10:41 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 40 min |
| Jul 6, 12:04 AM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 41 min |
| Jul 6, 1:15 PM PDT | Severe Thunderstorm Warning | SGX | San Bernardino | 45 min |
| Jul 6, 2:48 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 42 min |
| Jul 6, 5:04 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 41 min |
| Jul 7, 4:55 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 50 min |
| Jul 8, 8:07 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 38 min |
| Jul 9, 1:56 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 34 min |
| Jul 9, 4:27 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 22 min |
| Jul 10, 3:09 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 20 min |
| Jul 10, 5:37 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 53 min |
| Jul 29, 3:04 PM PDT | Severe Thunderstorm Warning | VEF | Inyo | 41 min |
| Jul 30, 12:58 PM PDT | Severe Thunderstorm Warning | SGX | San Bernardino | 32 min |
| Jul 30, 1:41 PM PDT | Severe Thunderstorm Warning | SGX | San Bernardino | 49 min |
| Jul 30, 2:13 PM PDT | Severe Thunderstorm Warning | SGX | San Bernardino | 32 min |
| Jul 30, 2:17 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 43 min |
| Jul 30, 2:48 PM PDT | Severe Thunderstorm Warning | HNX | Kern | 42 min |
| Jul 30, 3:31 PM PDT | Severe Thunderstorm Warning | HNX | Kern | 44 min |
| Jul 30, 5:12 PM PDT | Severe Thunderstorm Warning | VEF | Inyo | 22 min |
| Jul 31, 12:34 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 56 min |
| Jul 31, 3:42 PM PDT | Severe Thunderstorm Warning | PSR | Riverside | 36 min |
| Jul 31, 3:52 PM PDT | Severe Thunderstorm Warning | SGX | San Bernardino | 38 min |
| Jul 31, 4:20 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 40 min |
| Aug 1, 4:45 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 45 min |
| Aug 1, 5:06 PM PDT | Severe Thunderstorm Warning | HNX | Kern | 39 min |
| Aug 1, 5:11 PM PDT | Severe Thunderstorm Warning | LOX | Los Angeles | 19 min |
| Aug 1, 5:29 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 46 min |
| Aug 1, 5:30 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 45 min |
| Aug 1, 8:30 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 45 min |
| Aug 6, 5:53 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 22 min |
| Aug 13, 1:50 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 25 min |
| Aug 13, 2:15 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 30 min |
| Aug 27, 1:37 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 30 min |
| Aug 27, 3:29 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 32 min |
| Aug 27, 4:11 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 49 min |
| Aug 27, 4:18 PM PDT | Severe Thunderstorm Warning | HNX | Kern | 42 min |
| Aug 27, 5:00 PM PDT | Severe Thunderstorm Warning | HNX | Kern | 30 min |
| Aug 27, 5:20 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 40 min |
| Aug 27, 6:57 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 48 min |
| Aug 27, 10:02 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 58 min |
| Aug 28, 1:46 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 29 min |
| Aug 28, 2:14 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 31 min |
| Aug 28, 2:47 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 43 min |
| Aug 28, 3:11 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 34 min |
| Sep 5, 4:19 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 41 min |
| Sep 10, 7:37 AM PDT | Severe Thunderstorm Warning | SGX | Orange | 23 min |
| Sep 10, 8:13 AM PDT | Severe Thunderstorm Warning | LOX | Los Angeles | 47 min |
| Sep 10, 11:52 AM PDT | Severe Thunderstorm Warning | LOX | Santa Barbara | 23 min |
| Sep 10, 12:20 PM PDT | Severe Thunderstorm Warning | LOX | Santa Barbara | 25 min |
| Sep 10, 2:16 PM PDT | Severe Thunderstorm Warning | LOX | Los Angeles | 29 min |
| Sep 10, 2:51 PM PDT | Severe Thunderstorm Warning | LOX | Los Angeles | 39 min |
| Sep 10, 3:35 PM PDT | Severe Thunderstorm Warning | LOX | Los Angeles | 25 min |
| Sep 10, 4:16 PM PDT | Severe Thunderstorm Warning | LOX | Los Angeles | 29 min |
| Sep 10, 4:41 PM PDT | Severe Thunderstorm Warning | LOX | Los Angeles | 64 min |
| Sep 10, 5:23 PM PDT | Severe Thunderstorm Warning | LOX | Los Angeles | 28 min |
| Sep 10, 5:57 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 40 min |
| Sep 10, 6:39 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 51 min |
| Sep 10, 7:19 PM PDT | Severe Thunderstorm Warning | HNX | Kern | 26 min |
| Sep 10, 8:19 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 20 min |
| Sep 10, 9:35 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 40 min |
| Sep 11, 4:11 PM PDT | Severe Thunderstorm Warning | STO | Plumas, Sierra | 34 min |
| Sep 12, 3:58 PM PDT | Severe Thunderstorm Warning | STO | Plumas | 32 min |
| Sep 12, 4:53 PM PDT | Severe Thunderstorm Warning | REV | Lassen | 37 min |
| Sep 12, 5:02 PM PDT | Severe Thunderstorm Warning | MFR | Modoc, Siskiyou | 28 min |
| Sep 12, 5:28 PM PDT | Severe Thunderstorm Warning | REV | Lassen | 32 min |
| Sep 13, 3:59 AM PDT | Severe Thunderstorm Warning | SGX | San Diego | 29 min |
| Sep 13, 6:22 AM PDT | Severe Thunderstorm Warning | SGX | San Bernardino | 38 min |
| Sep 13, 6:47 AM PDT | Severe Thunderstorm Warning | SGX | San Bernardino | 28 min |
| Sep 13, 6:59 AM PDT | Severe Thunderstorm Warning | SGX | San Bernardino | 46 min |
| Sep 13, 7:05 AM PDT | Severe Thunderstorm Warning | PSR | Riverside, San Bernardino | 55 min |
| Sep 13, 7:55 AM PDT | Severe Thunderstorm Warning | PSR | Riverside, San Bernardino | 55 min |
| Sep 13, 9:38 AM PDT | Severe Thunderstorm Warning | PSR | Riverside | 33 min |
| Sep 13, 10:00 AM PDT | Severe Thunderstorm Warning | PSR | Imperial, Riverside | 60 min |
| Sep 13, 10:53 AM PDT | Severe Thunderstorm Warning | PSR | Riverside, San Bernardino | 40 min |
| Sep 13, 1:20 PM PDT | Severe Thunderstorm Warning | SGX | San Bernardino | 40 min |
| Sep 13, 1:21 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 54 min |
| Sep 13, 2:12 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 63 min |
| Sep 13, 2:55 PM PDT | Severe Thunderstorm Warning | SGX | Riverside, San Bernardino | 29 min |
| Sep 13, 3:11 PM PDT | Severe Thunderstorm Warning | LOX | Los Angeles, Ventura | 64 min |
| Sep 13, 3:51 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 24 min |
| Sep 13, 4:14 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 16 min |
| Sep 13, 7:50 PM PDT | Severe Thunderstorm Warning | STO | Plumas, Sierra | 40 min |
| Sep 13, 7:59 PM PDT | Severe Thunderstorm Warning | REV | Plumas | 31 min |
| Sep 13, 8:07 PM PDT | Severe Thunderstorm Warning | STO | Plumas | 38 min |
| Sep 13, 8:29 PM PDT | Severe Thunderstorm Warning | STO | Plumas, Sierra, Yuba | 61 min |
| Sep 14, 5:36 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 39 min |
| Sep 23, 4:38 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 37 min |
| Sep 23, 5:14 PM PDT | Severe Thunderstorm Warning | HNX | Kern | 31 min |
| Sep 24, 4:18 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 42 min |
| Oct 3, 2:53 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 37 min |
| Oct 5, 5:28 PM PDT | Severe Thunderstorm Warning | STO | Butte, Tehama | 47 min |
| Oct 5, 6:17 PM PDT | Severe Thunderstorm Warning | STO | Butte | 42 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- San Bernardino County43
- Los Angeles County12
- Riverside County11
- Imperial County9
- San Diego County8
- Plumas County7
- Kern County7
- Inyo County4
- Alpine County4
- Amador County4
- Sierra County4
- Santa Barbara County3
- Siskiyou County3
- Ventura County3
- Butte County3
- Yuba County3
- Calaveras County3
- Tuolumne County3
- Orange County2
- Colusa County2
- Sutter County2
- Tehama County2
- El Dorado County2
- Lassen County2
- San Luis Obispo County1
- Sacramento County1
- Glenn County1
- Solano County1
- Modoc County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20102012
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.