Alert archive / California / Excessive Heat Warnings
Excessive Heat Warnings in California, 2018
35 excessive heat warnings in 2018. 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 2018. Tap one for its archive.
- Excessive Heat Warnings
- 35
- Busiest month
- July15 excessive heat warnings
- Busiest day
- July 20, 20184 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 |
|---|---|---|---|---|
| May 4, 12:29 PM PDT | Excessive Heat Warning | PSR | Imperial, Riverside | 56 hr |
| May 5, 1:34 AM PDT | Excessive Heat Warning | VEF | San Bernardino | 42 hr |
| May 8, 2:30 AM PDT | Excessive Heat Warning | PSR | Imperial, Riverside | 41 hr |
| May 8, 2:30 AM PDT | Excessive Heat Warning | VEF | San Bernardino | 42 hr |
| Jun 1, 12:51 PM PDT | Excessive Heat Warning | PSR | Imperial, Riverside, San Bernardino | 3 days |
| Jun 1, 1:00 PM PDT | Excessive Heat Warning | SGX | Riverside, San Diego | 3 days |
| Jun 4, 2:18 AM PDT | Excessive Heat Warning | VEF | San Bernardino | 18 hr |
| Jun 11, 12:57 PM PDT | Excessive Heat Warning | SGX | Riverside, San Diego | 55 hr |
| Jun 11, 1:39 PM PDT | Excessive Heat Warning | VEF | Inyo, San Bernardino | 54 hr |
| Jun 11, 1:46 PM PDT | Excessive Heat Warning | PSR | Imperial, Riverside, San Bernardino | 54 hr |
| Jun 19, 11:51 AM PDT | Excessive Heat Warning | VEF | Inyo, San Bernardino | 4 days |
| Jun 19, 1:02 PM PDT | Excessive Heat Warning | SGX | Riverside, San Bernardino, San Diego | 3 days |
| Jun 19, 1:31 PM PDT | Excessive Heat Warning | PSR | Imperial, Riverside, San Bernardino | 3 days |
| Jul 4, 3:22 AM PDT | Excessive Heat Warning | VEF | Inyo, San Bernardino | 66 hr |
| Jul 4, 3:27 AM PDT | Excessive Heat Warning | PSR | Imperial, Riverside, San Bernardino | 66 hr |
| Jul 5, 2:40 AM PDT | Excessive Heat Warning | SGX | Orange, Riverside, San Bernardino, San Diego | 66 hr |
| Jul 5, 11:01 AM PDT | Excessive Heat Warning | LOX | Los Angeles, Santa Barbara | 58 hr |
| Jul 7, 2:40 AM PDT | Excessive Heat Warning | HNX | 42 hr | |
| Jul 7, 2:46 AM PDT | Excessive Heat Warning | VEF | Inyo, San Bernardino | 42 hr |
| Jul 11, 2:14 PM PDT | Excessive Heat Warning | MFR | Siskiyou | 6 days |
| Jul 16, 9:41 AM PDT | Excessive Heat Warning | STO | 58 hr | |
| Jul 17, 3:41 AM PDT | Excessive Heat Warning | VEF | 41 hr | |
| Jul 20, 2:13 AM PDT | Excessive Heat Warning | SGX | Orange, Riverside, San Bernardino, San Diego | 9 days |
| Jul 20, 3:05 AM PDT | Excessive Heat Warning | VEF | Inyo, San Bernardino | 9 days |
| Jul 20, 3:13 AM PDT | Excessive Heat Warning | PSR | Imperial, Riverside, San Bernardino | 8 days |
| Jul 20, 2:20 PM PDT | Excessive Heat Warning | LOX | Los Angeles | 8 days |
| Jul 23, 5:08 AM PDT | Excessive Heat Warning | HNX | 7 days | |
| Jul 25, 8:35 AM PDT | Excessive Heat Warning | STO | 59 hr | |
| Aug 5, 1:22 AM PDT | Excessive Heat Warning | PSR | Imperial, Riverside, San Bernardino | 67 hr |
| Aug 5, 2:23 AM PDT | Excessive Heat Warning | VEF | Inyo, San Bernardino | 5 days |
| Aug 5, 1:05 PM PDT | Excessive Heat Warning | SGX | Orange, Riverside, San Bernardino, San Diego | 55 hr |
| Aug 5, 2:05 PM PDT | Excessive Heat Warning | LOX | Los Angeles | 4 days |
| Aug 6, 12:26 PM PDT | Excessive Heat Warning | HNX | 3 days | |
| Aug 9, 3:25 AM PDT | Excessive Heat Warning | SGX | San Diego | 17 hr |
| Sep 7, 2:19 AM PDT | Excessive Heat Warning | PSR | Imperial, Riverside, San Bernardino | 42 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20172019
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.