Alert archive / California / Severe Thunderstorm Warnings / 2017
Severe Thunderstorm Warnings in California, September 2017
59 severe thunderstorm warnings in September 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 September 2017. Tap one for its archive.
- Severe Thunderstorm Warnings
- 59
- Busiest day
- September 8, 201712 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 |
|---|---|---|---|---|
| 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.
- Kern County13
- Riverside County10
- Imperial County8
- Santa Barbara County6
- Tulare County6
- El Dorado County6
- San Luis Obispo County5
- Fresno County5
- Kings County5
- Madera County4
- Mariposa County4
- San Bernardino County3
- Trinity County3
- Placer County3
- Alpine County2
- Amador County2
- San Diego County2
- Merced County2
- Tuolumne County2
- Orange County1
- Lassen County1
- Plumas County1
- Humboldt County1
- Shasta County1
- Calaveras County1
- Los Angeles County1
- Ventura County1
- Nevada County1
- Sierra County1
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. Warning verification from the Mesonet's Cow. Rebuilt daily.