Alert archive / California / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in California, 2017
160 severe thunderstorm warnings in 2017. 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 2017. Tap one for its archive.
- Severe Thunderstorm Warnings
- 160
- Busiest month
- September59 severe thunderstorm warnings
- Busiest day
- September 8, 201712 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 |
|---|---|---|---|---|
| Jan 20, 12:38 PM PST | Severe Thunderstorm Warning | SGX | Orange | 22 min |
| Jan 20, 12:52 PM PST | Severe Thunderstorm Warning | SGX | Orange | 23 min |
| Jan 20, 1:51 PM PST | Severe Thunderstorm Warning | SGX | San Diego | 54 min |
| Jan 20, 2:25 PM PST | Severe Thunderstorm Warning | SGX | San Diego | 50 min |
| Jan 23, 2:35 PM PST | Severe Thunderstorm Warning | STO | Sutter, Yuba | 55 min |
| Feb 5, 4:54 PM PST | Severe Thunderstorm Warning | EKA | Humboldt | 36 min |
| Feb 17, 4:51 PM PST | Severe Thunderstorm Warning | SGX | Orange | 54 min |
| Feb 17, 5:43 PM PST | Severe Thunderstorm Warning | SGX | San Diego | 62 min |
| Feb 17, 5:48 PM PST | Severe Thunderstorm Warning | SGX | Orange | 57 min |
| Mar 21, 1:50 PM PDT | Severe Thunderstorm Warning | STO | Stanislaus, Tuolumne | 40 min |
| Mar 21, 2:16 PM PDT | Severe Thunderstorm Warning | HNX | Mariposa, Merced, Tuolumne | 29 min |
| Mar 21, 2:29 PM PDT | Severe Thunderstorm Warning | STO | Tuolumne | 61 min |
| Mar 21, 2:44 PM PDT | Severe Thunderstorm Warning | HNX | Mariposa, Merced, Tuolumne | 31 min |
| Mar 21, 3:14 PM PDT | Severe Thunderstorm Warning | HNX | Mariposa, Tuolumne | 31 min |
| Mar 21, 5:59 PM PDT | Severe Thunderstorm Warning | HNX | Tulare | 31 min |
| Mar 21, 6:30 PM PDT | Severe Thunderstorm Warning | HNX | Tulare | 30 min |
| Apr 3, 3:40 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 50 min |
| Apr 13, 2:51 PM PDT | Severe Thunderstorm Warning | STO | Nevada, Yuba | 24 min |
| May 4, 7:13 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 21 min |
| May 4, 8:09 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 20 min |
| May 4, 8:47 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 28 min |
| Jun 18, 5:06 PM PDT | Severe Thunderstorm Warning | REV | Mono | 24 min |
| Jun 19, 3:37 PM PDT | Severe Thunderstorm Warning | STO | Plumas, Tehama | 38 min |
| Jun 19, 4:38 PM PDT | Severe Thunderstorm Warning | REV | Lassen | 37 min |
| Jun 19, 7:05 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 20 min |
| Jun 19, 7:53 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 52 min |
| Jun 19, 8:44 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 28 min |
| Jun 25, 2:42 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 33 min |
| Jun 25, 4:01 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 29 min |
| Jun 25, 4:09 PM PDT | Severe Thunderstorm Warning | MFR | Modoc | 51 min |
| Jun 25, 4:29 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 31 min |
| Jun 25, 4:30 PM PDT | Severe Thunderstorm Warning | REV | Lassen | 45 min |
| Jun 25, 4:33 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 14 min |
| Jun 25, 5:01 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 29 min |
| Jun 25, 5:03 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 27 min |
| Jun 25, 6:02 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 43 min |
| Jun 25, 6:22 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 38 min |
| Jun 26, 7:40 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 50 min |
| Jul 17, 7:19 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 56 min |
| Jul 17, 8:09 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 35 min |
| Jul 24, 4:23 PM PDT | Severe Thunderstorm Warning | REV | Lassen | 52 min |
| Jul 24, 5:23 PM PDT | Severe Thunderstorm Warning | MFR | Modoc | 22 min |
| Jul 24, 5:51 PM PDT | Severe Thunderstorm Warning | MFR | Modoc | 10 min |
| Jul 25, 2:18 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 27 min |
| Jul 25, 5:46 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 29 min |
| Aug 1, 1:26 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 64 min |
| Aug 1, 3:01 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 59 min |
| Aug 1, 3:23 PM PDT | Severe Thunderstorm Warning | SGX | Orange, Riverside | 52 min |
| Aug 1, 3:57 PM PDT | Severe Thunderstorm Warning | SGX | Orange, Riverside | 45 min |
| Aug 1, 4:00 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 45 min |
| Aug 1, 5:30 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 75 min |
| Aug 1, 6:09 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 51 min |
| Aug 2, 1:21 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 54 min |
| Aug 2, 1:43 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 47 min |
| Aug 2, 2:46 PM PDT | Severe Thunderstorm Warning | HNX | Madera, Mariposa | 29 min |
| Aug 2, 3:14 PM PDT | Severe Thunderstorm Warning | HNX | Fresno, Madera, Mariposa | 31 min |
| Aug 2, 3:37 PM PDT | Severe Thunderstorm Warning | REV | Placer | 23 min |
| Aug 2, 3:59 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 46 min |
| Aug 2, 4:41 PM PDT | Severe Thunderstorm Warning | REV | El Dorado, Placer | 34 min |
| Aug 2, 5:33 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 42 min |
| Aug 2, 7:18 PM PDT | Severe Thunderstorm Warning | STO | Plumas | 27 min |
| Aug 2, 7:19 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 26 min |
| Aug 2, 7:47 PM PDT | Severe Thunderstorm Warning | STO | Plumas | 28 min |
| Aug 3, 1:30 PM PDT | Severe Thunderstorm Warning | PSR | Riverside | 45 min |
| Aug 3, 1:40 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 39 min |
| Aug 3, 3:24 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 36 min |
| Aug 3, 4:35 PM PDT | Severe Thunderstorm Warning | SGX | Riverside, San Bernardino | 40 min |
| Aug 5, 3:30 PM PDT | Severe Thunderstorm Warning | HNX | Madera, Mariposa, Tuolumne | 45 min |
| Aug 6, 4:21 PM PDT | Severe Thunderstorm Warning | REV | Lassen, Sierra | 39 min |
| Aug 6, 5:32 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 28 min |
| Aug 9, 1:50 PM PDT | Severe Thunderstorm Warning | EKA | Mendocino, Trinity | 23 min |
| Aug 9, 2:28 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 32 min |
| Aug 9, 2:50 PM PDT | Severe Thunderstorm Warning | EKA | Mendocino | 25 min |
| Aug 9, 3:05 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 25 min |
| Aug 9, 3:10 PM PDT | Severe Thunderstorm Warning | EKA | Mendocino | 35 min |
| Aug 9, 3:47 PM PDT | Severe Thunderstorm Warning | STO | Colusa, Glenn, Lake | 28 min |
| Aug 9, 4:02 PM PDT | Severe Thunderstorm Warning | STO | Shasta | 43 min |
| Aug 9, 4:14 PM PDT | Severe Thunderstorm Warning | STO | Shasta | 32 min |
| Aug 9, 5:08 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 37 min |
| Aug 9, 5:50 PM PDT | Severe Thunderstorm Warning | REV | Lassen | 25 min |
| Aug 9, 7:19 PM PDT | Severe Thunderstorm Warning | REV | Lassen, Plumas | 26 min |
| Aug 10, 3:28 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 32 min |
| Aug 10, 3:30 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 30 min |
| Aug 10, 4:05 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 25 min |
| Aug 10, 4:08 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 37 min |
| Aug 10, 4:30 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 30 min |
| Aug 10, 4:40 PM PDT | Severe Thunderstorm Warning | STO | Glenn, Lake | 35 min |
| Aug 10, 5:17 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 28 min |
| Aug 10, 6:35 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 25 min |
| Aug 11, 2:42 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 48 min |
| Aug 12, 5:19 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 45 min |
| Aug 18, 5:09 PM PDT | Severe Thunderstorm Warning | HNX | Mariposa | 51 min |
| Aug 19, 3:39 PM PDT | Severe Thunderstorm Warning | STO | Tuolumne | 51 min |
| Aug 20, 5:35 PM PDT | Severe Thunderstorm Warning | REV | El Dorado, Placer | 25 min |
| Aug 22, 2:55 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 35 min |
| Aug 22, 3:36 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 24 min |
| Aug 22, 6:15 PM PDT | Severe Thunderstorm Warning | HNX | Tuolumne | 30 min |
| Aug 23, 1:39 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 66 min |
| Aug 31, 2:25 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 65 min |
| Aug 31, 3:04 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 56 min |
| Aug 31, 3:35 PM PDT | Severe Thunderstorm Warning | SGX | Riverside, San Bernardino | 55 min |
| Sep 2, 5:29 PM PDT | Severe Thunderstorm Warning | SGX | Orange, Riverside | 38 min |
| Sep 2, 6:58 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 47 min |
| Sep 3, 3:38 PM PDT | Severe Thunderstorm Warning | LOX | San Luis Obispo, Santa Barbara | 52 min |
| Sep 3, 6:17 PM PDT | Severe Thunderstorm Warning | HNX | Kern | 28 min |
| Sep 3, 7:03 PM PDT | Severe Thunderstorm Warning | HNX | Fresno, Kern, Kings, Tulare | 27 min |
| Sep 5, 2:54 PM PDT | Severe Thunderstorm Warning | STO | Alpine, Amador, El Dorado | 34 min |
| Sep 6, 4:07 PM PDT | Severe Thunderstorm Warning | PSR | Riverside | 53 min |
| Sep 6, 4:43 PM PDT | Severe Thunderstorm Warning | REV | Lassen, Plumas | 26 min |
| Sep 6, 4:51 PM PDT | Severe Thunderstorm Warning | EKA | Humboldt, Trinity | 9 min |
| Sep 6, 5:03 PM PDT | Severe Thunderstorm Warning | STO | Shasta | 23 min |
| Sep 6, 5:40 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 20 min |
| Sep 6, 5:58 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 12 min |
| Sep 6, 6:02 PM PDT | Severe Thunderstorm Warning | PSR | Imperial, Riverside | 38 min |
| Sep 7, 3:38 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 37 min |
| Sep 7, 4:42 PM PDT | Severe Thunderstorm Warning | PSR | Imperial, Riverside | 63 min |
| Sep 7, 5:22 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 53 min |
| Sep 7, 5:39 PM PDT | Severe Thunderstorm Warning | PSR | Riverside | 51 min |
| Sep 7, 8:06 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 54 min |
| Sep 8, 1:38 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 37 min |
| Sep 8, 2:23 PM PDT | Severe Thunderstorm Warning | PSR | Imperial, Riverside | 37 min |
| Sep 8, 2:24 PM PDT | Severe Thunderstorm Warning | REV | El Dorado, Placer | 36 min |
| Sep 8, 2:53 PM PDT | Severe Thunderstorm Warning | PSR | Riverside | 37 min |
| Sep 8, 2:55 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 35 min |
| Sep 8, 3:28 PM PDT | Severe Thunderstorm Warning | REV | El Dorado, Placer | 32 min |
| Sep 8, 4:07 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 23 min |
| Sep 8, 4:23 PM PDT | Severe Thunderstorm Warning | STO | Alpine, Amador, Calaveras, El Dorado | 52 min |
| Sep 8, 4:25 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 50 min |
| Sep 8, 5:12 PM PDT | Severe Thunderstorm Warning | PSR | Imperial, Riverside | 48 min |
| Sep 8, 5:13 PM PDT | Severe Thunderstorm Warning | STO | El Dorado | 47 min |
| Sep 8, 5:43 PM PDT | Severe Thunderstorm Warning | PSR | Riverside | 47 min |
| Sep 8, 5:49 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 56 min |
| Sep 9, 2:26 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 64 min |
| Sep 9, 7:44 PM PDT | Severe Thunderstorm Warning | HNX | Kern | 31 min |
| Sep 9, 7:44 PM PDT | Severe Thunderstorm Warning | LOX | Los Angeles | 31 min |
| Sep 9, 8:14 PM PDT | Severe Thunderstorm Warning | HNX | Kern | 31 min |
| Sep 10, 4:00 PM PDT | Severe Thunderstorm Warning | LOX | San Luis Obispo, Santa Barbara | 60 min |
| Sep 10, 5:53 PM PDT | Severe Thunderstorm Warning | LOX | San Luis Obispo, Santa Barbara, Ventura | 52 min |
| Sep 10, 5:57 PM PDT | Severe Thunderstorm Warning | HNX | Kern | 33 min |
| Sep 10, 6:45 PM PDT | Severe Thunderstorm Warning | LOX | San Luis Obispo, Santa Barbara | 30 min |
| Sep 10, 7:19 PM PDT | Severe Thunderstorm Warning | LOX | San Luis Obispo, Santa Barbara | 41 min |
| Sep 10, 11:27 PM PDT | Severe Thunderstorm Warning | LOX | Santa Barbara | 48 min |
| Sep 11, 9:31 AM PDT | Severe Thunderstorm Warning | HNX | Kern | 29 min |
| Sep 11, 3:13 PM PDT | Severe Thunderstorm Warning | HNX | Kern | 32 min |
| Sep 11, 3:32 PM PDT | Severe Thunderstorm Warning | HNX | Kern | 43 min |
| Sep 11, 3:44 PM PDT | Severe Thunderstorm Warning | HNX | Kern | 31 min |
| Sep 11, 3:58 PM PDT | Severe Thunderstorm Warning | HNX | Kern | 32 min |
| Sep 11, 4:40 PM PDT | Severe Thunderstorm Warning | HNX | Kern, Tulare | 35 min |
| Sep 11, 4:51 PM PDT | Severe Thunderstorm Warning | HNX | Kern, Kings, Tulare | 24 min |
| Sep 11, 5:12 PM PDT | Severe Thunderstorm Warning | HNX | Kern, Tulare | 33 min |
| Sep 11, 5:16 PM PDT | Severe Thunderstorm Warning | HNX | Kings, Tulare | 29 min |
| Sep 11, 5:37 PM PDT | Severe Thunderstorm Warning | HNX | Fresno, Kings | 38 min |
| Sep 11, 5:37 PM PDT | Severe Thunderstorm Warning | HNX | Tulare | 23 min |
| Sep 11, 6:14 PM PDT | Severe Thunderstorm Warning | HNX | Fresno, Kings, Madera | 46 min |
| Sep 11, 6:42 PM PDT | Severe Thunderstorm Warning | HNX | Fresno, Madera, Mariposa, Merced | 48 min |
| Sep 11, 7:40 PM PDT | Severe Thunderstorm Warning | HNX | Fresno, Madera, Mariposa, Merced | 50 min |
| Sep 12, 2:57 PM PDT | Severe Thunderstorm Warning | STO | Nevada, Sierra | 48 min |
| Sep 13, 3:57 PM PDT | Severe Thunderstorm Warning | REV | El Dorado, Placer | 48 min |
| Sep 13, 5:09 PM PDT | Severe Thunderstorm Warning | HNX | Madera, Mariposa, Tuolumne | 36 min |
| Sep 13, 5:48 PM PDT | Severe Thunderstorm Warning | HNX | Mariposa, Tuolumne | 42 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Siskiyou County22
- Riverside County19
- San Bernardino County13
- Kern County13
- Trinity County12
- San Diego County11
- Mariposa County11
- Tuolumne County10
- Imperial County10
- Tulare County8
- El Dorado County8
- Orange County7
- Lassen County7
- Madera County7
- Fresno County6
- Placer County6
- Santa Barbara County6
- Plumas County5
- San Luis Obispo County5
- Kings County5
- Merced County4
- Modoc County3
- Mendocino County3
- Shasta County3
- Yuba County2
- Humboldt County2
- Nevada County2
- Sierra County2
- Glenn County2
- Lake County2
- Alpine County2
- Amador County2
- Sutter County1
- Stanislaus County1
- Mono County1
- Tehama County1
- Colusa County1
- Calaveras County1
- Los Angeles County1
- Ventura County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20162018
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.