Alert archive / California / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in California, 1999
65 severe thunderstorm warnings in 1999. 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 1999. Tap one for its archive.
- Severe Thunderstorm Warnings
- 65
- Busiest month
- August24 severe thunderstorm warnings
- Busiest day
- July 12, 19996 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 19, 4:24 PM PST | Severe Thunderstorm Warning | STO | Shasta | 36 min |
| Apr 1, 2:45 PM PST | Severe Thunderstorm Warning | LOX | Santa Barbara | 60 min |
| Apr 3, 4:45 PM PST | Severe Thunderstorm Warning | MTR | Santa Clara | 45 min |
| Apr 8, 7:58 PM PDT | Severe Thunderstorm Warning | HNX | Kings, Tulare | 32 min |
| Apr 23, 4:35 PM PDT | Severe Thunderstorm Warning | LOX | Los Angeles, Ventura | 60 min |
| Apr 23, 5:30 PM PDT | Severe Thunderstorm Warning | LOX | Los Angeles, Ventura | 60 min |
| May 24, 2:52 PM PDT | Severe Thunderstorm Warning | STO | Amador, Calaveras | 28 min |
| May 24, 4:05 PM PDT | Severe Thunderstorm Warning | STO | Placer | 30 min |
| May 24, 5:50 PM PDT | Severe Thunderstorm Warning | REV | Nevada | 40 min |
| May 24, 7:26 PM PDT | Severe Thunderstorm Warning | REV | Plumas, Sierra | 44 min |
| May 27, 5:20 PM PDT | Severe Thunderstorm Warning | LOX | Los Angeles | 40 min |
| Jun 2, 2:32 PM PDT | Severe Thunderstorm Warning | STO | Colusa, Glenn | 43 min |
| Jul 11, 5:26 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 34 min |
| Jul 11, 6:29 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 61 min |
| Jul 12, 1:56 PM PDT | Severe Thunderstorm Warning | HNX | Kern | 34 min |
| Jul 12, 2:30 PM PDT | Severe Thunderstorm Warning | LOX | San Luis Obispo, Santa Barbara | 60 min |
| Jul 12, 2:30 PM PDT | Severe Thunderstorm Warning | LOX | Ventura | 60 min |
| Jul 12, 4:41 PM PDT | Severe Thunderstorm Warning | STO | Tuolumne | 34 min |
| Jul 13, 2:00 PM PDT | Severe Thunderstorm Warning | LOX | Santa Barbara, Ventura | 60 min |
| Jul 13, 2:17 PM PDT | Severe Thunderstorm Warning | STO | Tehama | 53 min |
| Jul 13, 2:45 PM PDT | Severe Thunderstorm Warning | STO | Alpine | 60 min |
| Jul 13, 3:06 PM PDT | Severe Thunderstorm Warning | LOX | Los Angeles | 24 min |
| Jul 14, 12:33 PM PDT | Severe Thunderstorm Warning | SGX | San Bernardino | 57 min |
| Jul 14, 2:38 PM PDT | Severe Thunderstorm Warning | HNX | Madera | 57 min |
| Jul 14, 6:03 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 42 min |
| Jul 15, 12:21 AM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 84 min |
| Jul 28, 4:04 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 41 min |
| Jul 28, 4:44 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 61 min |
| Jul 28, 5:18 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 57 min |
| Jul 28, 6:15 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 60 min |
| Aug 4, 7:03 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 47 min |
| Aug 4, 8:00 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 60 min |
| Aug 4, 8:33 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 32 min |
| Aug 4, 9:10 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 30 min |
| Aug 4, 9:45 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 45 min |
| Aug 6, 12:58 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 42 min |
| Aug 6, 12:58 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 87 min |
| Aug 9, 5:30 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 60 min |
| Aug 10, 1:05 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 30 min |
| Aug 10, 1:25 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 30 min |
| Aug 10, 2:15 PM PDT | Severe Thunderstorm Warning | REV | Mono | 45 min |
| Aug 10, 2:22 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 63 min |
| Aug 10, 3:05 PM PDT | Severe Thunderstorm Warning | MFR | Siskiyou | 60 min |
| Aug 19, 2:59 PM PDT | Severe Thunderstorm Warning | PSR | Riverside | 61 min |
| Aug 19, 5:50 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 55 min |
| Aug 19, 6:15 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 45 min |
| Aug 19, 6:55 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 35 min |
| Aug 22, 4:28 PM PDT | Severe Thunderstorm Warning | STO | El Dorado | 32 min |
| Aug 22, 4:59 PM PDT | Severe Thunderstorm Warning | STO | Placer | 26 min |
| Aug 23, 2:25 PM PDT | Severe Thunderstorm Warning | STO | Shasta | 60 min |
| Aug 23, 3:00 PM PDT | Severe Thunderstorm Warning | MFR | Modoc, Siskiyou | 60 min |
| Aug 25, 6:36 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 54 min |
| Aug 27, 10:22 PM PDT | Severe Thunderstorm Warning | PSR | Riverside | 38 min |
| Aug 29, 6:18 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 57 min |
| Sep 12, 3:40 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 65 min |
| Sep 12, 4:07 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 53 min |
| Sep 12, 5:12 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 63 min |
| Sep 12, 6:17 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 58 min |
| Sep 12, 8:45 PM PDT | Severe Thunderstorm Warning | VEF | Inyo | 60 min |
| Sep 12, 8:45 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 60 min |
| Sep 12, 9:44 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 61 min |
| Sep 16, 5:55 AM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 50 min |
| Sep 22, 6:45 AM PDT | Severe Thunderstorm Warning | STO | San Joaquin | 45 min |
| Nov 30, 11:07 AM PST | Severe Thunderstorm Warning | EKA | Del Norte | 63 min |
| Nov 30, 11:12 AM PST | Severe Thunderstorm Warning | EKA | Humboldt | 63 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- San Bernardino County11
- Siskiyou County9
- Imperial County6
- San Diego County5
- Los Angeles County4
- Ventura County4
- Santa Barbara County3
- Riverside County3
- Shasta County2
- Placer County2
- Trinity County2
- Santa Clara County1
- Kings County1
- Tulare County1
- Amador County1
- Calaveras County1
- Nevada County1
- Plumas County1
- Sierra County1
- Colusa County1
- Glenn County1
- Kern County1
- San Luis Obispo County1
- Tuolumne County1
- Tehama County1
- Alpine County1
- Madera County1
- Mono County1
- El Dorado County1
- Modoc County1
- Inyo County1
- San Joaquin County1
- Del Norte County1
- Humboldt County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive19982000
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.