Alert archive / California / Excessive Heat Warnings / 2021
Excessive Heat Warnings in California, August 2021
16 excessive heat warnings in August 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 warnings reaches back to 2005.
Excessive Heat Warnings by county
Each county as a circle sized by its count in August 2021. Tap one for its archive.
- Excessive Heat Warnings
- 16
- Busiest day
- August 2, 20215 excessive heat 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 |
|---|---|---|---|---|
| Aug 2, 11:38 AM PDT | Excessive Heat Warning | SGX | Riverside, San Bernardino, San Diego | 3 days |
| Aug 2, 11:55 AM PDT | Excessive Heat Warning | LOX | 56 hr | |
| Aug 2, 12:10 PM PDT | Excessive Heat Warning | HNX | 56 hr | |
| Aug 2, 12:48 PM PDT | Excessive Heat Warning | VEF | Inyo, San Bernardino | 3 days |
| Aug 2, 1:45 PM PDT | Excessive Heat Warning | PSR | Imperial, Riverside, San Bernardino | 3 days |
| Aug 9, 11:28 AM PDT | Excessive Heat Warning | MFR | Siskiyou | 5 days |
| Aug 13, 10:59 AM PDT | Excessive Heat Warning | LOX | Santa Barbara | 3 days |
| Aug 13, 12:50 PM PDT | Excessive Heat Warning | HNX | 3 days | |
| Aug 13, 1:47 PM PDT | Excessive Heat Warning | SGX | San Bernardino | 3 days |
| Aug 13, 2:18 PM PDT | Excessive Heat Warning | VEF | Inyo, San Bernardino | 3 days |
| Aug 24, 1:20 PM PDT | Excessive Heat Warning | PSR | Imperial, Riverside, San Bernardino | 5 days |
| Aug 24, 1:30 PM PDT | Excessive Heat Warning | SGX | Riverside, San Bernardino, San Diego | 5 days |
| Aug 25, 12:50 AM PDT | Excessive Heat Warning | VEF | San Bernardino | 6 days |
| Aug 26, 2:07 AM PDT | Excessive Heat Warning | VEF | Inyo, San Bernardino | 5 days |
| Aug 27, 12:33 PM PDT | Excessive Heat Warning | HNX | 3 days | |
| Aug 27, 1:57 PM PDT | Excessive Heat Warning | LOX | 3 days |
By county
Every county with at least one alert. A county page lists each alert that covered it.
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.