Alert archive / California / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in California, 2012
108 severe thunderstorm warnings in 2012. 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 2012. Tap one for its archive.
- Severe Thunderstorm Warnings
- 108
- Busiest month
- August41 severe thunderstorm warnings
- Busiest day
- September 10, 20129 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 |
|---|---|---|---|---|
| Mar 31, 3:14 PM PDT | Severe Thunderstorm Warning | EKA | Del Norte | 16 min |
| Apr 11, 1:02 PM PDT | Severe Thunderstorm Warning | HNX | Fresno, Kings, Tulare | 43 min |
| Apr 11, 1:44 PM PDT | Severe Thunderstorm Warning | HNX | Fresno, Kings, Tulare | 31 min |
| Apr 11, 2:13 PM PDT | Severe Thunderstorm Warning | HNX | Fresno, Kings, Tulare | 47 min |
| Apr 11, 3:26 PM PDT | Severe Thunderstorm Warning | HNX | Fresno, Tulare | 34 min |
| Apr 11, 6:55 PM PDT | Severe Thunderstorm Warning | HNX | Fresno, Kings | 35 min |
| Apr 12, 5:18 PM PDT | Severe Thunderstorm Warning | HNX | Merced | 42 min |
| Apr 12, 5:31 PM PDT | Severe Thunderstorm Warning | STO | Amador, Calaveras, Sacramento, San Joaquin | 43 min |
| Apr 12, 5:53 PM PDT | Severe Thunderstorm Warning | STO | Calaveras, San Joaquin, Stanislaus | 34 min |
| Apr 12, 5:58 PM PDT | Severe Thunderstorm Warning | HNX | Mariposa, Merced | 47 min |
| Apr 12, 6:43 PM PDT | Severe Thunderstorm Warning | HNX | Mariposa, Merced | 47 min |
| Apr 12, 8:14 PM PDT | Severe Thunderstorm Warning | MTR | San Mateo | 31 min |
| Apr 13, 4:16 AM PDT | Severe Thunderstorm Warning | LOX | San Luis Obispo | 59 min |
| Apr 13, 1:50 PM PDT | Severe Thunderstorm Warning | SGX | Orange | 25 min |
| Apr 23, 2:20 PM PDT | Severe Thunderstorm Warning | MFR | Modoc | 40 min |
| Apr 23, 3:11 PM PDT | Severe Thunderstorm Warning | MFR | Modoc | 25 min |
| Apr 25, 9:46 PM PDT | Severe Thunderstorm Warning | HNX | Kern, Tulare | 29 min |
| Apr 25, 10:31 PM PDT | Severe Thunderstorm Warning | HNX | Tulare | 29 min |
| May 14, 3:26 PM PDT | Severe Thunderstorm Warning | STO | Lassen, Shasta | 42 min |
| Jun 4, 4:32 PM PDT | Severe Thunderstorm Warning | STO | Shasta, Tehama | 43 min |
| Jun 4, 5:50 PM PDT | Severe Thunderstorm Warning | STO | Shasta, Tehama | 55 min |
| Jun 4, 6:46 PM PDT | Severe Thunderstorm Warning | STO | Tehama | 59 min |
| Jul 13, 3:09 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 66 min |
| Jul 13, 4:09 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 51 min |
| Jul 13, 5:30 PM PDT | Severe Thunderstorm Warning | PSR | Imperial, Riverside | 60 min |
| Jul 13, 6:42 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 43 min |
| Jul 14, 1:42 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 21 min |
| Jul 14, 4:22 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 38 min |
| Jul 14, 4:56 PM PDT | Severe Thunderstorm Warning | SGX | San Bernardino | 34 min |
| Jul 14, 5:30 PM PDT | Severe Thunderstorm Warning | SGX | San Bernardino | 45 min |
| Jul 14, 11:35 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 40 min |
| Jul 15, 3:07 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 38 min |
| Jul 15, 4:16 PM PDT | Severe Thunderstorm Warning | SGX | San Bernardino | 44 min |
| Jul 15, 4:52 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 38 min |
| Jul 15, 5:28 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 47 min |
| Jul 15, 6:12 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 48 min |
| Jul 23, 12:12 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 48 min |
| Jul 23, 1:54 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 66 min |
| Jul 30, 3:09 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 51 min |
| Jul 30, 4:50 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 40 min |
| Jul 30, 5:54 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 51 min |
| Jul 31, 12:12 PM PDT | Severe Thunderstorm Warning | PSR | Riverside, San Bernardino | 49 min |
| Aug 3, 6:25 PM PDT | Severe Thunderstorm Warning | VEF | Inyo | 50 min |
| Aug 5, 3:26 PM PDT | Severe Thunderstorm Warning | EKA | Humboldt, Trinity | 34 min |
| Aug 5, 3:58 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 16 min |
| Aug 5, 4:18 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 27 min |
| Aug 5, 4:31 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 29 min |
| Aug 5, 6:09 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 36 min |
| Aug 10, 4:11 PM PDT | Severe Thunderstorm Warning | PSR | Riverside | 64 min |
| Aug 11, 2:03 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 27 min |
| Aug 11, 2:23 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 22 min |
| Aug 11, 2:46 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 44 min |
| Aug 11, 3:05 PM PDT | Severe Thunderstorm Warning | SGX | Riverside, San Diego | 40 min |
| Aug 11, 3:33 PM PDT | Severe Thunderstorm Warning | SGX | Orange, Riverside | 42 min |
| Aug 12, 3:48 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 27 min |
| Aug 12, 4:15 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 45 min |
| Aug 12, 5:29 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 46 min |
| Aug 12, 5:33 PM PDT | Severe Thunderstorm Warning | HNX | Kern | 27 min |
| Aug 12, 6:14 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 46 min |
| Aug 13, 4:28 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 37 min |
| Aug 14, 4:18 PM PDT | Severe Thunderstorm Warning | REV | Nevada, Placer | 42 min |
| Aug 15, 4:47 PM PDT | Severe Thunderstorm Warning | REV | Nevada | 43 min |
| Aug 16, 12:45 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 30 min |
| Aug 16, 1:13 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 32 min |
| Aug 16, 1:41 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 49 min |
| Aug 16, 3:09 PM PDT | Severe Thunderstorm Warning | SGX | Riverside, San Bernardino | 34 min |
| Aug 17, 12:55 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 50 min |
| Aug 17, 1:39 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 51 min |
| Aug 21, 1:50 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 40 min |
| Aug 21, 2:47 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 28 min |
| Aug 21, 3:15 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 35 min |
| Aug 21, 7:57 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 48 min |
| Aug 22, 10:05 AM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 25 min |
| Aug 22, 11:27 AM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 48 min |
| Aug 29, 1:26 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 34 min |
| Aug 29, 3:23 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 37 min |
| Aug 29, 6:38 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 52 min |
| Aug 29, 6:43 PM PDT | Severe Thunderstorm Warning | PSR | Riverside, San Bernardino | 62 min |
| Aug 30, 12:11 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 34 min |
| Aug 30, 12:18 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 57 min |
| Aug 30, 1:52 PM PDT | Severe Thunderstorm Warning | SGX | Riverside, San Bernardino | 53 min |
| Aug 30, 2:45 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 60 min |
| Aug 30, 3:26 PM PDT | Severe Thunderstorm Warning | HNX | Kern | 34 min |
| Sep 3, 6:08 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 37 min |
| Sep 5, 4:56 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 26 min |
| Sep 9, 4:41 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 34 min |
| Sep 9, 4:46 PM PDT | Severe Thunderstorm Warning | LOX | Los Angeles | 39 min |
| Sep 9, 5:15 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 60 min |
| Sep 9, 5:23 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 45 min |
| Sep 9, 6:16 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 59 min |
| Sep 9, 6:54 PM PDT | Severe Thunderstorm Warning | PSR | San Bernardino | 38 min |
| Sep 10, 1:17 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 49 min |
| Sep 10, 2:33 PM PDT | Severe Thunderstorm Warning | SGX | Orange, Riverside | 50 min |
| Sep 10, 3:49 PM PDT | Severe Thunderstorm Warning | LOX | Los Angeles | 26 min |
| Sep 10, 4:11 PM PDT | Severe Thunderstorm Warning | LOX | Los Angeles | 64 min |
| Sep 10, 4:25 PM PDT | Severe Thunderstorm Warning | HNX | Kern | 35 min |
| Sep 10, 5:03 PM PDT | Severe Thunderstorm Warning | HNX | Kern | 27 min |
| Sep 11, 5:25 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 35 min |
| Sep 11, 5:54 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 19 min |
| Sep 11, 8:36 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 39 min |
| Sep 11, 9:59 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 76 min |
| Oct 10, 4:05 PM PDT | Severe Thunderstorm Warning | MTR | Santa Clara, Santa Cruz | 25 min |
| Oct 10, 4:28 PM PDT | Severe Thunderstorm Warning | MTR | Santa Clara, Santa Cruz | 32 min |
| Oct 11, 1:51 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 24 min |
| Oct 11, 4:18 PM PDT | Severe Thunderstorm Warning | VEF | Inyo, San Bernardino | 27 min |
| Oct 11, 5:25 PM PDT | Severe Thunderstorm Warning | VEF | Inyo | 35 min |
| Oct 11, 5:52 PM PDT | Severe Thunderstorm Warning | VEF | Inyo | 53 min |
| Oct 11, 6:47 PM PDT | Severe Thunderstorm Warning | VEF | Inyo | 12 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- San Bernardino County32
- Riverside County18
- San Diego County13
- Imperial County9
- Tulare County6
- Fresno County5
- Kern County5
- Inyo County5
- Kings County4
- Trinity County4
- Merced County3
- Orange County3
- Shasta County3
- Tehama County3
- Los Angeles County3
- Calaveras County2
- San Joaquin County2
- Mariposa County2
- Modoc County2
- Nevada County2
- Santa Clara County2
- Santa Cruz County2
- Del Norte County1
- Amador County1
- Sacramento County1
- Stanislaus County1
- San Mateo County1
- San Luis Obispo County1
- Lassen County1
- Humboldt County1
- Siskiyou County1
- Placer County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20112013
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.