Alert archive / California / Excessive Heat Warnings

Excessive Heat Warnings in California, 2020

51 excessive heat warnings 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 excessive heat warnings reaches back to 2005.

Excessive Heat Warnings by county

Each county as a circle sized by its count in 2020. Tap one for its archive.

Excessive Heat Warnings
51
Busiest month
August15 excessive heat warnings
Busiest day
May 24, 20206 excessive heat warnings

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.

IssuedProductOfficeCountiesLasted
Apr 24, 1:32 PM PDTExcessive Heat WarningPSRImperial, Riverside71 hr
Apr 24, 1:41 PM PDTExcessive Heat WarningSGXRiverside, San Bernardino, San Diego6 days
Apr 25, 2:11 PM PDTExcessive Heat WarningVEFInyo, San Bernardino5 days
Apr 27, 3:44 AM PDTExcessive Heat WarningPSRImperial, Riverside4 days
May 4, 1:20 PM PDTExcessive Heat WarningSGXRiverside, San Diego4 days
May 5, 2:36 AM PDTExcessive Heat WarningPSRImperial, Riverside65 hr
May 7, 2:10 AM PDTExcessive Heat WarningVEFInyo66 hr
May 24, 2:32 AM PDTExcessive Heat WarningVEFInyo, San Bernardino6 days
May 24, 2:54 AM PDTExcessive Heat WarningSGXRiverside, San Bernardino, San Diego6 days
May 24, 2:55 AM PDTExcessive Heat WarningPSRImperial, Riverside, San Bernardino8 days
May 24, 4:39 AM PDTExcessive Heat WarningLOX5 days
May 24, 10:54 AM PDTExcessive Heat WarningSTO4 days
May 24, 12:33 PM PDTExcessive Heat WarningHNX4 days
Jun 2, 1:06 AM PDTExcessive Heat WarningVEFInyo, San Bernardino67 hr
Jun 2, 2:04 AM PDTExcessive Heat WarningPSRImperial, Riverside, San Bernardino66 hr
Jun 2, 12:50 PM PDTExcessive Heat WarningSGXRiverside, San Diego54 hr
Jul 8, 1:42 PM PDTExcessive Heat WarningSGXRiverside, San Bernardino, San Diego5 days
Jul 8, 1:52 PM PDTExcessive Heat WarningVEFInyo, San Bernardino5 days
Jul 8, 2:19 PM PDTExcessive Heat WarningPSRImperial, Riverside, San Bernardino5 days
Jul 11, 2:53 AM PDTExcessive Heat WarningHNX49 hr
Jul 11, 9:55 AM PDTExcessive Heat WarningLOX34 hr
Jul 28, 2:57 AM PDTExcessive Heat WarningPSRImperial, Riverside, San Bernardino8 days
Jul 28, 3:42 AM PDTExcessive Heat WarningVEFInyo, San Bernardino5 days
Jul 28, 12:36 PM PDTExcessive Heat WarningSGXRiverside, San Bernardino, San Diego5 days
Aug 2, 1:52 AM PDTExcessive Heat WarningPSRImperial66 hr
Aug 11, 1:27 PM PDTExcessive Heat WarningPSRImperial, Riverside, San Bernardino9 days
Aug 12, 1:10 PM PDTExcessive Heat WarningVEFInyo, San Bernardino9 days
Aug 12, 1:39 PM PDTExcessive Heat WarningSGXOrange, Riverside, San Bernardino, San Diego9 days
Aug 12, 2:07 PM PDTExcessive Heat WarningLOXLos Angeles, Santa Barbara9 days
Aug 13, 2:57 AM PDTExcessive Heat WarningHNX9 days
Aug 13, 11:23 AM PDTExcessive Heat WarningEKALake, Mendocino56 hr
Aug 13, 11:32 AM PDTExcessive Heat WarningSTO6 days
Aug 13, 1:03 PM PDTExcessive Heat WarningMTRAlameda, Contra Costa, Marin, Monterey, Napa, San Benito and 4 more6 days
Aug 13, 1:13 PM PDTExcessive Heat WarningMFRSiskiyou4 days
Aug 18, 2:13 AM PDTExcessive Heat WarningEKALake, Mendocino18 hr
Aug 23, 2:25 AM PDTExcessive Heat WarningPSRImperial, Riverside, San Bernardino6 days
Aug 23, 2:42 AM PDTExcessive Heat WarningVEFSan Bernardino5 days
Aug 25, 3:43 AM PDTExcessive Heat WarningSGXRiverside, San Diego4 days
Aug 28, 1:48 AM PDTExcessive Heat WarningPSRImperial, Riverside18 hr
Sep 2, 11:53 AM PDTExcessive Heat WarningVEFInyo, San Bernardino5 days
Sep 2, 12:12 PM PDTExcessive Heat WarningSGXOrange, Riverside, San Bernardino, San Diego5 days
Sep 2, 12:24 PM PDTExcessive Heat WarningLOXLos Angeles, Santa Barbara5 days
Sep 2, 1:33 PM PDTExcessive Heat WarningPSRImperial, Riverside, San Bernardino5 days
Sep 3, 1:35 AM PDTExcessive Heat WarningHNX5 days
Sep 3, 10:02 AM PDTExcessive Heat WarningSTO4 days
Sep 3, 1:13 PM PDTExcessive Heat WarningMTRAlameda, Contra Costa, Marin, Monterey, Napa, San Benito and 4 more4 days
Sep 3, 2:01 PM PDTExcessive Heat WarningEKADel Norte, Humboldt, Lake, Mendocino, Trinity5 days
Sep 5, 7:50 PM PDTExcessive Heat WarningMFRSiskiyou48 hr
Sep 15, 1:57 PM PDTExcessive Heat WarningPSRImperial54 hr
Sep 30, 1:22 PM PDTExcessive Heat WarningLOXLos Angeles31 hr
Sep 30, 1:30 PM PDTExcessive Heat WarningSGXOrange, Riverside, San Bernardino, San Diego55 hr

By county

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

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force nowTornadoes on recordThe radar archive20192021

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.