Alert archive / California / Excessive Heat Warnings
Excessive Heat Warnings in California, 2024
49 excessive heat warnings in 2024. 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 warnings reaches back to 2005.
Excessive Heat Warnings by county
Each county as a circle sized by its count in 2024. Tap one for its archive.
- Excessive Heat Warnings
- 49
- Busiest month
- June19 excessive heat warnings
- Busiest day
- June 29, 20244 excessive heat 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 |
|---|---|---|---|---|
| Jun 2, 1:21 PM PDT | Excessive Heat Warning | STO | 4 days | |
| Jun 2, 1:47 PM PDT | Excessive Heat Warning | HNX | Fresno, Kern, Kings, Madera, Mariposa, Merced and 1 more | 5 days |
| Jun 3, 1:43 AM PDT | Excessive Heat Warning | VEF | Inyo, San Bernardino | 6 days |
| Jun 3, 12:15 PM PDT | Excessive Heat Warning | PSR | Imperial, Riverside, San Bernardino | 4 days |
| Jun 4, 2:03 AM PDT | Excessive Heat Warning | SGX | Riverside, San Bernardino, San Diego | 4 days |
| Jun 4, 3:07 AM PDT | Excessive Heat Warning | LOX | Los Angeles | 65 hr |
| Jun 9, 1:10 PM PDT | Excessive Heat Warning | STO | 3 days | |
| Jun 10, 12:12 AM PDT | Excessive Heat Warning | VEF | Inyo | 69 hr |
| Jun 13, 1:03 AM PDT | Excessive Heat Warning | PSR | Imperial, Riverside | 67 hr |
| Jun 13, 2:19 AM PDT | Excessive Heat Warning | SGX | Riverside, San Diego | 66 hr |
| Jun 21, 12:04 PM PDT | Excessive Heat Warning | LOX | Los Angeles, Santa Barbara, Ventura | 4 days |
| Jun 21, 12:53 PM PDT | Excessive Heat Warning | SGX | Riverside, San Bernardino, San Diego | 6 days |
| Jun 29, 2:09 AM PDT | Excessive Heat Warning | HNX | Fresno, Kern, Kings, Madera, Mariposa, Merced and 1 more | 15 days |
| Jun 29, 12:00 PM PDT | Excessive Heat Warning | STO | 14 days | |
| Jun 29, 1:02 PM PDT | Excessive Heat Warning | SGX | Riverside, San Bernardino, San Diego | 15 days |
| Jun 29, 1:17 PM PDT | Excessive Heat Warning | PSR | Imperial, Riverside, San Bernardino | 15 days |
| Jun 30, 1:19 AM PDT | Excessive Heat Warning | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 4 more | 13 days |
| Jun 30, 3:19 AM PDT | Excessive Heat Warning | EKA | Humboldt, Lake, Mendocino, Trinity | 14 days |
| Jun 30, 11:32 AM PDT | Excessive Heat Warning | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 13 days |
| Jul 1, 1:07 AM PDT | Excessive Heat Warning | VEF | Inyo, San Bernardino | 12 days |
| Jul 2, 10:57 AM PDT | Excessive Heat Warning | MFR | Siskiyou | 8 days |
| Jul 8, 2:13 AM PDT | Excessive Heat Warning | SGX | Riverside, San Bernardino | 22 min |
| Jul 10, 4:43 PM PDT | Excessive Heat Warning | MFR | Siskiyou | 3 days |
| Jul 18, 12:52 AM PDT | Excessive Heat Warning | VEF | Inyo, San Bernardino | 8 days |
| Jul 18, 1:14 AM PDT | Excessive Heat Warning | PSR | Imperial, Riverside, San Bernardino | 9 days |
| Jul 18, 2:21 AM PDT | Excessive Heat Warning | SGX | Riverside, San Bernardino, San Diego | 9 days |
| Jul 18, 2:44 AM PDT | Excessive Heat Warning | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 8 days |
| Jul 18, 9:17 PM PDT | Excessive Heat Warning | HNX | Fresno, Kern, Kings, Madera, Mariposa, Merced and 1 more | 7 days |
| Jul 20, 2:00 PM PDT | Excessive Heat Warning | MTR | Alameda, Contra Costa, Monterey, San Benito, Santa Clara | 3 days |
| Aug 1, 12:27 PM PDT | Excessive Heat Warning | SGX | Riverside, San Bernardino, San Diego | 5 days |
| Aug 1, 1:26 PM PDT | Excessive Heat Warning | PSR | Imperial, Riverside, San Bernardino | 5 days |
| Aug 3, 12:38 AM PDT | Excessive Heat Warning | VEF | Inyo, San Bernardino | 4 days |
| Aug 4, 1:03 AM PDT | Excessive Heat Warning | HNX | Fresno, Kern, Kings, Madera, Mariposa, Merced and 1 more | 4 days |
| Aug 5, 2:44 AM PDT | Excessive Heat Warning | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 41 hr |
| Aug 8, 7:58 PM PDT | Excessive Heat Warning | LOX | Los Angeles | 48 hr |
| Aug 18, 12:51 PM PDT | Excessive Heat Warning | PSR | Imperial, Riverside | 55 hr |
| Sep 2, 12:04 PM PDT | Excessive Heat Warning | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 8 days |
| Sep 2, 1:09 PM PDT | Excessive Heat Warning | SGX | Orange, Riverside, San Bernardino, San Diego | 8 days |
| Sep 3, 12:07 AM PDT | Excessive Heat Warning | PSR | Imperial, Riverside, San Bernardino | 8 days |
| Sep 3, 1:50 AM PDT | Excessive Heat Warning | VEF | Inyo, San Bernardino | 4 days |
| Sep 3, 11:42 AM PDT | Excessive Heat Warning | HNX | Kern | 4 days |
| Sep 24, 12:30 AM PDT | Excessive Heat Warning | PSR | Imperial, Riverside | 15 days |
| Sep 24, 12:42 PM PDT | Excessive Heat Warning | VEF | Inyo, San Bernardino | 13 days |
| Sep 25, 1:49 AM PDT | Excessive Heat Warning | SGX | Riverside, San Diego | 4 days |
| Sep 29, 12:14 PM PDT | Excessive Heat Warning | SGX | Orange, Riverside, San Bernardino, San Diego | 9 days |
| Sep 30, 1:01 AM PDT | Excessive Heat Warning | EKA | Lake, Mendocino | 12 min |
| Sep 30, 12:38 PM PDT | Excessive Heat Warning | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more | 6 days |
| Sep 30, 1:03 PM PDT | Excessive Heat Warning | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 3 days |
| Oct 4, 2:45 AM PDT | Excessive Heat Warning | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 4 days |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- San Bernardino County19
- Riverside County18
- San Diego County9
- Los Angeles County9
- Imperial County8
- Inyo County7
- Santa Barbara County7
- Ventura County7
- San Luis Obispo County6
- Kern County5
- Fresno County4
- Kings County4
- Madera County4
- Mariposa County4
- Merced County4
- Tulare County4
- Alameda County3
- Contra Costa County3
- Monterey County3
- San Benito County3
- Santa Clara County3
- Marin County2
- Napa County2
- San Mateo County2
- Santa Cruz County2
- Sonoma County2
- Lake County2
- Mendocino County2
- Siskiyou County2
- Orange County2
- Humboldt County1
- Trinity County1
- City and County of San Francisco1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20232025
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.