Alert archive / California / Excessive Heat Warnings / 2017
Excessive Heat Warnings in California, August 2017
14 excessive heat warnings in August 2017. 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 2017. Tap one for its archive.
- Excessive Heat Warnings
- 14
- Busiest day
- August 26, 20175 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, 2:57 AM PDT | Excessive Heat Warning | REV | Lassen, Modoc, Plumas, Sierra | 38 hr |
| Aug 25, 8:03 AM PDT | Excessive Heat Warning | MTR | Alameda, Contra Costa, Monterey, San Benito, San Mateo, Santa Clara and 1 more | 4 days |
| Aug 25, 3:55 PM PDT | Excessive Heat Warning | HNX | 5 days | |
| Aug 26, 2:50 AM PDT | Excessive Heat Warning | PSR | Imperial, Riverside, San Bernardino | 5 days |
| Aug 26, 2:56 AM PDT | Excessive Heat Warning | VEF | Inyo, San Bernardino | 5 days |
| Aug 26, 3:59 AM PDT | Excessive Heat Warning | SGX | Orange, Riverside, San Bernardino, San Diego | 8 days |
| Aug 26, 4:01 AM PDT | Excessive Heat Warning | STO | 64 hr | |
| Aug 26, 5:31 AM PDT | Excessive Heat Warning | LOX | Los Angeles, Santa Barbara | 8 days |
| Aug 28, 10:26 PM PDT | Excessive Heat Warning | LOX | 5 days | |
| Aug 30, 3:30 AM PDT | Excessive Heat Warning | STO | 5 days | |
| Aug 30, 1:27 PM PDT | Excessive Heat Warning | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more | 4 days |
| Aug 30, 2:35 PM PDT | Excessive Heat Warning | EKA | Del Norte, Humboldt, Mendocino, Trinity | 4 days |
| Aug 31, 3:01 AM PDT | Excessive Heat Warning | HNX | 68 hr | |
| Aug 31, 1:23 PM PDT | Excessive Heat Warning | MFR | Siskiyou | 58 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- San Bernardino County3
- Alameda County2
- Contra Costa County2
- Monterey County2
- San Benito County2
- San Mateo County2
- Santa Clara County2
- Santa Cruz County2
- Riverside County2
- Lassen County1
- Modoc County1
- Plumas County1
- Sierra County1
- Imperial County1
- Inyo County1
- Orange County1
- San Diego County1
- Los Angeles County1
- Santa Barbara County1
- Marin County1
- Napa County1
- City and County of San Francisco1
- Sonoma County1
- Del Norte County1
- Humboldt County1
- Mendocino County1
- Trinity County1
- Siskiyou County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive20162018
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.