Alert archive / California / Heat Advisories / 2021

Heat Advisories in California, June 2021

15 heat advisories in June 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 heat advisories reaches back to 2005.

Heat Advisories by county

Each county as a circle sized by its count in June 2021. Tap one for its archive.

Heat Advisories: 15
Busiest day: June 25, 20213 heat advisories

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
Jun 2, 10:18 PM PDT	Heat Advisory	HNX		22 hr
Jun 14, 1:17 PM PDT	Heat Advisory	MTR	Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 4 more	4 days
Jun 14, 1:59 PM PDT	Heat Advisory	SGX	Orange	4 days
Jun 15, 3:13 AM PDT	Heat Advisory	EKA	Humboldt, Mendocino, Trinity	5 days
Jun 16, 2:47 AM PDT	Heat Advisory	LOX	Los Angeles	42 hr
Jun 17, 9:05 PM PDT	Heat Advisory	LOX	Los Angeles	48 hr
Jun 18, 9:06 PM PDT	Heat Advisory	MTR	Alameda, Contra Costa, Monterey, San Benito	23 hr
Jun 19, 9:21 PM PDT	Heat Advisory	EKA	Lake, Mendocino, Trinity	17 hr
Jun 24, 1:56 PM PDT	Heat Advisory	EKA	Humboldt, Lake, Mendocino, Trinity	5 days
Jun 25, 1:05 PM PDT	Heat Advisory	SGX	Riverside, San Bernardino	3 days
Jun 25, 1:34 PM PDT	Heat Advisory	LOX	Los Angeles	3 days
Jun 25, 1:44 PM PDT	Heat Advisory	REV	Lassen, Modoc, Plumas, Sierra	42 hr
Jun 29, 2:20 AM PDT	Heat Advisory	MFR	Modoc, Siskiyou	8 days
Jun 29, 2:01 PM PDT	Heat Advisory	EKA		31 hr
Jun 30, 3:10 AM PDT	Heat Advisory	REV	Lassen, Modoc, Plumas, Sierra	17 hr

By county

Every county with at least one alert. A county page lists each alert that covered it.

Nearby

Alerts in force now Tornadoes on record The radar archive 2020 2022

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.