Alert archive / California / Excessive Heat Warnings

Excessive Heat Warnings in California, 2017

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

Excessive Heat Warnings by county

Each county as a circle sized by its count in 2017. Tap one for its archive.

Excessive Heat Warnings
35
Busiest month
August14 excessive heat warnings
Busiest day
August 26, 20175 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
May 23, 3:05 AM PDTExcessive Heat WarningPSRImperial17 hr
Jun 14, 2:50 AM PDTExcessive Heat WarningPSRImperial, Riverside, San Bernardino13 days
Jun 14, 1:47 PM PDTExcessive Heat WarningVEFInyo, San Bernardino12 days
Jun 15, 2:31 AM PDTExcessive Heat WarningSGXRiverside, San Bernardino, San Diego12 days
Jun 15, 1:50 PM PDTExcessive Heat WarningLOX10 days
Jun 15, 2:14 PM PDTExcessive Heat WarningHNX10 days
Jun 16, 4:52 AM PDTExcessive Heat WarningSTO9 days
Jun 20, 1:11 PM PDTExcessive Heat WarningMTRAlameda, Contra Costa, Monterey, San Mateo, Santa Clara, Santa Cruz56 hr
Jun 22, 3:00 PM PDTExcessive Heat WarningMFRSiskiyou3 days
Jul 4, 2:13 PM PDTExcessive Heat WarningPSRImperial, Riverside, San Bernardino3 days
Jul 5, 3:47 PM PDTExcessive Heat WarningLOXLos Angeles, Santa Barbara3 days
Jul 6, 2:15 AM PDTExcessive Heat WarningHNX4 days
Jul 6, 2:36 AM PDTExcessive Heat WarningSGXRiverside, San Bernardino, San Diego66 hr
Jul 6, 2:45 AM PDTExcessive Heat WarningVEFInyo, San Bernardino68 hr
Jul 30, 3:47 AM PDTExcessive Heat WarningMFRModoc, Siskiyou6 days
Jul 30, 11:11 AM PDTExcessive Heat WarningSTO4 days
Jul 30, 2:10 PM PDTExcessive Heat WarningEKADel Norte, Humboldt, Mendocino, Trinity4 days
Jul 30, 9:16 PM PDTExcessive Heat WarningLOX25 hr
Jul 31, 7:12 AM PDTExcessive Heat WarningSGXSan Bernardino14 hr
Aug 2, 2:57 AM PDTExcessive Heat WarningREVLassen, Modoc, Plumas, Sierra38 hr
Aug 25, 8:03 AM PDTExcessive Heat WarningMTRAlameda, Contra Costa, Monterey, San Benito, San Mateo, Santa Clara and 1 more4 days
Aug 25, 3:55 PM PDTExcessive Heat WarningHNX5 days
Aug 26, 2:50 AM PDTExcessive Heat WarningPSRImperial, Riverside, San Bernardino5 days
Aug 26, 2:56 AM PDTExcessive Heat WarningVEFInyo, San Bernardino5 days
Aug 26, 3:59 AM PDTExcessive Heat WarningSGXOrange, Riverside, San Bernardino, San Diego8 days
Aug 26, 4:01 AM PDTExcessive Heat WarningSTO64 hr
Aug 26, 5:31 AM PDTExcessive Heat WarningLOXLos Angeles, Santa Barbara8 days
Aug 28, 10:26 PM PDTExcessive Heat WarningLOX5 days
Aug 30, 3:30 AM PDTExcessive Heat WarningSTO5 days
Aug 30, 1:27 PM PDTExcessive Heat WarningMTRAlameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more4 days
Aug 30, 2:35 PM PDTExcessive Heat WarningEKADel Norte, Humboldt, Mendocino, Trinity4 days
Aug 31, 3:01 AM PDTExcessive Heat WarningHNX68 hr
Aug 31, 1:23 PM PDTExcessive Heat WarningMFRSiskiyou58 hr
Oct 21, 1:07 PM PDTExcessive Heat WarningSGXOrange, Riverside, San Bernardino, San Diego4 days
Oct 21, 2:44 PM PDTExcessive Heat WarningLOXLos Angeles4 days

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.

  1. August 26, 20175excessive heat warnings
  2. June 15, 20173excessive heat warnings
  3. July 6, 20173excessive heat warnings
  4. July 30, 20173excessive heat warnings
  5. August 30, 20173excessive heat warnings
  6. June 14, 20172excessive heat warnings
  7. July 31, 20172excessive heat warnings
  8. August 25, 20172excessive heat warnings
  9. August 31, 20172excessive heat warnings
  10. October 21, 20172excessive heat warnings
  11. May 23, 20171excessive heat warnings
  12. June 16, 20171excessive heat warnings

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.