Alert archive / California / Heat Advisories
Heat Advisories in California, 2017
48 heat advisories in 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 heat advisories reaches back to 2005.
Heat Advisories by county
Each county as a circle sized by its count in 2017. Tap one for its archive.
- Heat Advisories
- 48
- Busiest month
- July17 heat advisories
- Busiest day
- June 15, 20174 heat advisories
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 15, 2:31 AM PDT | Heat Advisory | SGX | Orange, Riverside, San Bernardino, San Diego | 7 days |
| Jun 15, 12:51 PM PDT | Heat Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 4 more | 8 days |
| Jun 15, 1:50 PM PDT | Heat Advisory | LOX | Los Angeles, Santa Barbara | 11 days |
| Jun 15, 3:25 PM PDT | Heat Advisory | STO | 9 days | |
| Jun 16, 3:16 AM PDT | Heat Advisory | EKA | Del Norte, Humboldt, Mendocino, Trinity | 7 days |
| Jun 22, 3:00 PM PDT | Heat Advisory | MFR | Siskiyou | 3 days |
| Jun 22, 3:03 PM PDT | Heat Advisory | SGX | Orange, Riverside, San Bernardino, San Diego | 4 days |
| Jun 22, 8:28 PM PDT | Heat Advisory | EKA | Del Norte, Humboldt, Mendocino, Trinity | 47 hr |
| Jun 23, 3:36 AM PDT | Heat Advisory | LOX | Los Angeles | 4 days |
| Jun 23, 4:02 AM PDT | Heat Advisory | HNX | 65 hr | |
| Jul 4, 9:03 PM PDT | Heat Advisory | LOX | Los Angeles, Santa Barbara | 4 days |
| Jul 6, 2:15 AM PDT | Heat Advisory | HNX | 45 hr | |
| Jul 6, 2:36 AM PDT | Heat Advisory | SGX | Orange, Riverside, San Bernardino, San Diego | 66 hr |
| Jul 7, 5:52 PM PDT | Heat Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 4 more | 27 hr |
| Jul 8, 1:13 AM PDT | Heat Advisory | STO | 45 hr | |
| Jul 9, 1:10 AM PDT | Heat Advisory | LOX | Los Angeles, Santa Barbara | 22 hr |
| Jul 13, 12:58 PM PDT | Heat Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 4 more | 3 days |
| Jul 14, 3:24 AM PDT | Heat Advisory | LOX | Los Angeles, Santa Barbara | 67 hr |
| Jul 14, 1:45 PM PDT | Heat Advisory | STO | 54 hr | |
| Jul 21, 8:30 AM PDT | Heat Advisory | STO | 60 hr | |
| Jul 30, 3:47 AM PDT | Heat Advisory | MFR | Modoc, Siskiyou | 6 days |
| Jul 30, 10:25 AM PDT | Heat Advisory | REV | Lassen, Modoc, Plumas, Sierra | 65 hr |
| Jul 30, 11:11 AM PDT | Heat Advisory | STO | 4 days | |
| Jul 30, 2:10 PM PDT | Heat Advisory | EKA | Humboldt, Mendocino | 4 days |
| Jul 30, 9:16 PM PDT | Heat Advisory | LOX | Los Angeles | 49 hr |
| Jul 31, 1:54 AM PDT | Heat Advisory | MTR | Monterey, San Benito, San Mateo, Santa Clara, Santa Cruz | 4 days |
| Jul 31, 7:12 AM PDT | Heat Advisory | SGX | San Bernardino | 20 hr |
| Aug 25, 8:03 AM PDT | Heat Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 3 more | 4 days |
| Aug 25, 8:43 AM PDT | Heat Advisory | STO | 19 hr | |
| Aug 26, 3:59 AM PDT | Heat Advisory | SGX | Orange, Riverside, San Bernardino, San Diego | 8 days |
| Aug 26, 5:31 AM PDT | Heat Advisory | LOX | Los Angeles, Santa Barbara | 28 hr |
| Aug 27, 6:49 AM PDT | Heat Advisory | EKA | Del Norte, Humboldt, Mendocino, Trinity | 13 hr |
| Aug 27, 10:00 PM PDT | Heat Advisory | LOX | Los Angeles | 5 hr |
| Aug 28, 3:17 AM PDT | Heat Advisory | EKA | Del Norte, Humboldt, Mendocino, Trinity | 17 hr |
| Aug 28, 12:45 PM PDT | Heat Advisory | LOX | 69 hr | |
| Aug 29, 2:23 PM PDT | Heat Advisory | HNX | 55 hr | |
| Aug 30, 1:27 PM PDT | Heat Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 2 more | 32 hr |
| Aug 30, 1:27 PM PDT | Heat Advisory | MTR | Marin, Monterey, City and County of San Francisco, San Mateo, Santa Cruz, Sonoma | 47 hr |
| Aug 30, 1:59 PM PDT | Heat Advisory | LOX | Los Angeles, Santa Barbara | 4 days |
| Aug 31, 3:51 AM PDT | Heat Advisory | EKA | Del Norte, Humboldt | 32 hr |
| Aug 31, 1:23 PM PDT | Heat Advisory | MFR | Siskiyou | 4 days |
| Sep 2, 10:41 AM PDT | Heat Advisory | EKA | Del Norte, Humboldt, Mendocino | 8 hr |
| Sep 2, 12:34 PM PDT | Heat Advisory | HNX | 32 hr | |
| Sep 2, 9:16 PM PDT | Heat Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more | 24 hr |
| Sep 3, 3:57 AM PDT | Heat Advisory | EKA | Del Norte, Humboldt, Mendocino | 18 hr |
| Sep 3, 4:52 AM PDT | Heat Advisory | SGX | Orange | 9 hr |
| Sep 11, 12:27 PM PDT | Heat Advisory | MTR | Monterey | 2 hr |
| Oct 22, 4:04 PM PDT | Heat Advisory | LOX | Los Angeles | 3 days |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Los Angeles County10
- Monterey County9
- Humboldt County8
- Marin County7
- San Benito County7
- San Mateo County7
- Santa Clara County7
- Sonoma County7
- Del Norte County7
- Mendocino County7
- Alameda County6
- Contra Costa County6
- Napa County6
- Santa Cruz County6
- Santa Barbara County6
- Orange County5
- San Bernardino County5
- Riverside County4
- San Diego County4
- Trinity County4
- Siskiyou County3
- Modoc County2
- City and County of San Francisco2
- Lassen County1
- Plumas County1
- Sierra County1
The busiest days
Days with the most alerts issued, by UTC date.
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.