Alert archive / California / Excessive Heat Watches
Excessive Heat Watches in California, 2021
54 excessive heat watches in 2021. 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 excessive heat watches reaches back to 2005.
Excessive Heat Watches by county
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Excessive Heat Watches
- 54
- Busiest month
- June19 excessive heat watches
- Busiest day
- July 6, 20217 excessive heat watches
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 |
|---|---|---|---|---|
| May 27, 2:17 PM PDT | Excessive Heat Watch | STO | 24 hr | |
| May 29, 3:07 AM PDT | Excessive Heat Watch | HNX | 5 hr | |
| May 29, 3:07 AM PDT | Excessive Heat Watch | MFR | Siskiyou | 10 hr |
| May 30, 3:02 AM PDT | Excessive Heat Watch | HNX | 25 hr | |
| May 30, 11:54 AM PDT | Excessive Heat Watch | VEF | Inyo, San Bernardino | 26 hr |
| Jun 1, 4:42 AM PDT | Excessive Heat Watch | HNX | 5 hr | |
| Jun 1, 4:42 AM PDT | Excessive Heat Watch | HNX | 5 hr | |
| Jun 9, 2:23 AM PDT | Excessive Heat Watch | PSR | Imperial, Riverside, San Bernardino | 35 hr |
| Jun 9, 12:51 PM PDT | Excessive Heat Watch | SGX | Orange, Riverside, San Bernardino, San Diego | 5 days |
| Jun 9, 1:04 PM PDT | Excessive Heat Watch | VEF | Inyo, San Bernardino | 24 hr |
| Jun 11, 1:54 PM PDT | Excessive Heat Watch | HNX | 4 days | |
| Jun 11, 2:03 PM PDT | Excessive Heat Watch | LOX | Los Angeles, Santa Barbara | 5 days |
| Jun 13, 8:30 AM PDT | Excessive Heat Watch | STO | 30 hr | |
| Jun 14, 3:19 PM PDT | Excessive Heat Watch | EKA | Lake, Mendocino, Trinity | 31 hr |
| Jun 17, 12:46 PM PDT | Excessive Heat Watch | MFR | Siskiyou | 25 hr |
| Jun 22, 3:12 PM PDT | Excessive Heat Watch | MFR | Modoc, Siskiyou | 23 hr |
| Jun 23, 12:59 PM PDT | Excessive Heat Watch | EKA | Humboldt, Lake, Mendocino, Trinity | 25 hr |
| Jun 23, 1:02 PM PDT | Excessive Heat Watch | REV | Lassen, Modoc, Plumas, Sierra | 62 hr |
| Jun 23, 1:47 PM PDT | Excessive Heat Watch | STO | 24 hr | |
| Jun 24, 1:31 PM PDT | Excessive Heat Watch | SGX | Riverside, San Bernardino, San Diego | 24 hr |
| Jun 24, 1:39 PM PDT | Excessive Heat Watch | HNX | 24 hr | |
| Jun 24, 1:59 PM PDT | Excessive Heat Watch | LOX | Los Angeles, Santa Barbara | 24 hr |
| Jun 25, 3:07 AM PDT | Excessive Heat Watch | VEF | Inyo, San Bernardino | 10 hr |
| Jun 25, 2:34 PM PDT | Excessive Heat Watch | PSR | Imperial, Riverside, San Bernardino | 12 hr |
| Jul 5, 12:12 PM PDT | Excessive Heat Watch | HNX | 23 hr | |
| Jul 5, 12:59 PM PDT | Excessive Heat Watch | PSR | Imperial, Riverside, San Bernardino | 49 hr |
| Jul 5, 1:04 PM PDT | Excessive Heat Watch | VEF | Inyo, San Bernardino | 25 hr |
| Jul 5, 3:18 PM PDT | Excessive Heat Watch | REV | Lassen, Modoc, Plumas, Sierra | 48 hr |
| Jul 6, 3:25 AM PDT | Excessive Heat Watch | SGX | San Bernardino | 10 hr |
| Jul 6, 11:40 AM PDT | Excessive Heat Watch | HNX | 24 hr | |
| Jul 6, 12:11 PM PDT | Excessive Heat Watch | STO | 26 hr | |
| Jul 6, 12:29 PM PDT | Excessive Heat Watch | LOX | Santa Barbara | 24 hr |
| Jul 6, 1:02 PM PDT | Excessive Heat Watch | EKA | Lake, Mendocino, Trinity | 23 hr |
| Jul 6, 1:26 PM PDT | Excessive Heat Watch | SGX | Riverside, San Bernardino, San Diego | 24 hr |
| Jul 6, 2:26 PM PDT | Excessive Heat Watch | MFR | Modoc, Siskiyou | 23 hr |
| Jul 7, 12:20 PM PDT | Excessive Heat Watch | MTR | Monterey, San Benito | 15 hr |
| Jul 27, 2:54 PM PDT | Excessive Heat Watch | MFR | Siskiyou | 12 hr |
| Aug 1, 12:50 PM PDT | Excessive Heat Watch | SGX | Riverside, San Bernardino, San Diego | 23 hr |
| Aug 1, 1:31 PM PDT | Excessive Heat Watch | PSR | Imperial, Riverside, San Bernardino | 24 hr |
| Aug 2, 1:52 AM PDT | Excessive Heat Watch | VEF | San Bernardino | 11 hr |
| Aug 2, 2:28 AM PDT | Excessive Heat Watch | LOX | 9 hr | |
| Aug 7, 1:23 PM PDT | Excessive Heat Watch | MFR | Siskiyou | 46 hr |
| Aug 8, 7:43 PM PDT | Excessive Heat Watch | EKA | Humboldt, Lake, Mendocino, Trinity | 34 hr |
| Aug 12, 9:57 AM PDT | Excessive Heat Watch | LOX | Santa Barbara | 25 hr |
| Aug 12, 10:32 AM PDT | Excessive Heat Watch | SGX | San Bernardino | 27 hr |
| Aug 12, 12:34 PM PDT | Excessive Heat Watch | HNX | 24 hr | |
| Aug 13, 2:37 AM PDT | Excessive Heat Watch | VEF | Inyo, San Bernardino | 12 hr |
| Aug 13, 12:50 PM PDT | Excessive Heat Watch | HNX | 20 hr | |
| Aug 23, 12:32 PM PDT | Excessive Heat Watch | SGX | Riverside, San Diego | 25 hr |
| Aug 23, 1:37 PM PDT | Excessive Heat Watch | PSR | Imperial, Riverside | 24 hr |
| Aug 24, 1:27 PM PDT | Excessive Heat Watch | VEF | San Bernardino | 11 hr |
| Sep 3, 1:17 PM PDT | Excessive Heat Watch | VEF | Inyo, San Bernardino | 37 hr |
| Sep 3, 1:18 PM PDT | Excessive Heat Watch | SGX | San Bernardino | 37 hr |
| Sep 4, 3:40 AM PDT | Excessive Heat Watch | HNX | 23 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- San Bernardino County19
- Riverside County10
- Siskiyou County6
- Inyo County6
- Imperial County5
- San Diego County5
- Santa Barbara County4
- Lake County4
- Mendocino County4
- Trinity County4
- Modoc County4
- Los Angeles County2
- Humboldt County2
- Lassen County2
- Plumas County2
- Sierra County2
- Orange County1
- Monterey County1
- San Benito County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20202022
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.