Alert archive / California / Heat Advisories

Heat Advisories in California, 2020

55 heat advisories in 2020. 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 2020. Tap one for its archive.

Heat Advisories: 55
Busiest month: June15 heat advisories
Busiest day: May 24, 20203 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
Apr 22, 1:01 PM PDT	Heat Advisory	SGX	Orange, Riverside, San Bernardino, San Diego	3 days
Apr 22, 1:18 PM PDT	Heat Advisory	LOX	Los Angeles	3 days
May 3, 1:22 PM PDT	Heat Advisory	SGX	Orange, Riverside, San Bernardino, San Diego	5 days
May 5, 2:05 PM PDT	Heat Advisory	LOX	Los Angeles	55 hr
May 24, 12:06 PM PDT	Heat Advisory	MTR	Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 4 more	4 days
May 24, 1:16 PM PDT	Heat Advisory	EKA	Lake, Mendocino, Trinity	4 days
May 24, 2:24 PM PDT	Heat Advisory	LOX		4 days
Jun 1, 12:47 PM PDT	Heat Advisory	MTR	Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 4 more	56 hr
Jun 1, 1:55 PM PDT	Heat Advisory	STO		3 days
Jun 2, 3:47 AM PDT	Heat Advisory	HNX		63 hr
Jun 2, 1:42 PM PDT	Heat Advisory	EKA	Mendocino	30 hr
Jun 3, 2:57 AM PDT	Heat Advisory	LOX		17 hr
Jun 7, 11:11 AM PDT	Heat Advisory	LOX		56 hr
Jun 7, 12:29 PM PDT	Heat Advisory	SGX	Orange, San Diego	55 hr
Jun 9, 2:17 PM PDT	Heat Advisory	LOX		29 hr
Jun 10, 2:59 AM PDT	Heat Advisory	SGX	Orange, Riverside, San Bernardino, San Diego	16 hr
Jun 21, 1:53 PM PDT	Heat Advisory	STO		5 days
Jun 21, 2:18 PM PDT	Heat Advisory	MFR	Siskiyou	58 hr
Jun 21, 3:08 PM PDT	Heat Advisory	EKA	Humboldt, Lake, Mendocino, Trinity	55 hr
Jun 22, 2:43 AM PDT	Heat Advisory	HNX		6 days
Jun 24, 3:05 AM PDT	Heat Advisory	EKA	Humboldt, Lake, Mendocino, Trinity	67 hr
Jun 24, 2:35 PM PDT	Heat Advisory	MFR	Modoc, Siskiyou	56 hr
Jul 9, 1:29 PM PDT	Heat Advisory	SGX	Orange, Riverside, San Bernardino, San Diego	3 days
Jul 9, 2:11 PM PDT	Heat Advisory	LOX	Los Angeles, Santa Barbara	3 days
Jul 10, 2:41 AM PDT	Heat Advisory	HNX		3 days
Jul 19, 3:51 AM PDT	Heat Advisory	MFR	Siskiyou	64 hr
Jul 24, 3:39 AM PDT	Heat Advisory	MFR	Modoc, Siskiyou	4 days
Jul 29, 2:19 AM PDT	Heat Advisory	SGX	Orange, Riverside, San Bernardino, San Diego	4 days
Jul 29, 5:29 AM PDT	Heat Advisory	LOX	Los Angeles, Santa Barbara	5 days
Aug 12, 2:07 PM PDT	Heat Advisory	LOX		9 days
Aug 13, 11:23 AM PDT	Heat Advisory	EKA	Del Norte, Humboldt, Lake, Mendocino, Trinity	3 days
Aug 13, 1:03 PM PDT	Heat Advisory	MTR	Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more	32 hr
Aug 13, 1:13 PM PDT	Heat Advisory	MFR	Modoc, Siskiyou	3 days
Aug 15, 12:00 AM PDT	Heat Advisory	MTR	Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more	69 hr
Aug 16, 3:40 AM PDT	Heat Advisory	REV	Modoc	4 days
Aug 17, 3:32 AM PDT	Heat Advisory	EKA	Lake, Mendocino	23 hr
Aug 17, 9:29 PM PDT	Heat Advisory	LOX	Santa Barbara	4 days
Aug 24, 1:17 PM PDT	Heat Advisory	SGX	Riverside, San Bernardino	4 days
Aug 27, 3:24 AM PDT	Heat Advisory	LOX	Los Angeles	18 hr
Aug 31, 3:08 AM PDT	Heat Advisory	MFR	Siskiyou	6 days
Sep 3, 11:29 AM PDT	Heat Advisory	REV	Alpine, El Dorado, Lassen, Modoc, Mono, Nevada and 3 more	3 days
Sep 3, 1:13 PM PDT	Heat Advisory	MTR	Alameda, Contra Costa, Marin, Monterey, City and County of San Francisco, San Mateo and 3 more	4 days
Sep 8, 3:33 AM PDT	Heat Advisory	EKA	Del Norte, Humboldt, Mendocino	11 hr
Sep 26, 11:35 AM PDT	Heat Advisory	MTR	Alameda, Contra Costa, Marin, Napa, City and County of San Francisco, San Mateo and 3 more	55 hr
Sep 27, 1:10 PM PDT	Heat Advisory	SGX	Orange, Riverside, San Bernardino, San Diego	4 days
Sep 27, 2:16 PM PDT	Heat Advisory	LOX	Los Angeles, Santa Barbara	5 days
Sep 28, 3:30 AM PDT	Heat Advisory	EKA	Del Norte, Humboldt, Mendocino	15 hr
Sep 29, 1:42 PM PDT	Heat Advisory	MTR	Monterey, San Benito	30 hr
Sep 29, 1:42 PM PDT	Heat Advisory	MTR	Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more	3 days
Sep 30, 1:22 PM PDT	Heat Advisory	LOX	Los Angeles	55 hr
Sep 30, 1:30 PM PDT	Heat Advisory	SGX	Orange, Riverside, San Bernardino, San Diego	55 hr
Oct 1, 3:29 AM PDT	Heat Advisory	STO		16 hr
Oct 11, 12:32 PM PDT	Heat Advisory	SGX	Orange, Riverside, San Bernardino, San Diego	5 days
Oct 11, 1:28 PM PDT	Heat Advisory	LOX	Los Angeles	5 days
Oct 14, 12:34 PM PDT	Heat Advisory	MTR	Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more	56 hr

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record The radar archive 2019 2021

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.