Alert archive / California / Winter Storm Warnings / 2021

Winter Storm Warnings in California, December 2021

33 winter storm warnings in December 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 winter storm warnings reaches back to 2005.

Winter Storm Warnings by county

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

Winter Storm Warnings
33
Busiest day
December 14, 20215 winter storm warnings

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.

IssuedProductOfficeCountiesLasted
Dec 10, 1:54 PM PSTWinter Storm WarningEKATrinity39 hr
Dec 10, 2:11 PM PSTWinter Storm WarningREVAlpine, El Dorado, Lassen, Mono, Nevada, Placer and 2 more4 days
Dec 10, 2:33 PM PSTWinter Storm WarningSTO4 days
Dec 10, 3:52 PM PSTWinter Storm WarningMFRModoc, Siskiyou4 days
Dec 11, 1:18 PM PSTWinter Storm WarningVEFInyo3 days
Dec 11, 1:19 PM PSTWinter Storm WarningHNXFresno, Kern, Madera, Mariposa, Tulare, Tuolumne3 days
Dec 12, 5:17 AM PSTWinter Storm WarningEKADel Norte, Humboldt, Trinity41 hr
Dec 13, 1:12 AM PSTWinter Storm WarningLOX43 hr
Dec 13, 3:53 AM PSTWinter Storm WarningSGXRiverside, San Bernardino44 hr
Dec 13, 11:29 PM PSTWinter Storm WarningSTO16 hr
Dec 14, 1:41 PM PSTWinter Storm WarningREVAlpine, El Dorado, Nevada, Placer44 hr
Dec 14, 2:12 PM PSTWinter Storm WarningMFRSiskiyou36 hr
Dec 14, 2:21 PM PSTWinter Storm WarningEKADel Norte, Humboldt, Lake, Mendocino, Trinity32 hr
Dec 14, 3:03 PM PSTWinter Storm WarningSTO43 hr
Dec 15, 8:04 AM PSTWinter Storm WarningHNXFresno, Madera, Mariposa, Tulare, Tuolumne29 hr
Dec 20, 2:35 PM PSTWinter Storm WarningSTO7 days
Dec 20, 2:59 PM PSTWinter Storm WarningHNXFresno, Kern, Madera, Mariposa, Tulare, Tuolumne7 days
Dec 20, 3:23 PM PSTWinter Storm WarningREVAlpine, El Dorado, Lassen, Modoc, Mono, Nevada and 3 more7 days
Dec 21, 1:00 AM PSTWinter Storm WarningVEFInyo5 days
Dec 21, 4:11 AM PSTWinter Storm WarningMFRSiskiyou51 hr
Dec 21, 1:40 PM PSTWinter Storm WarningEKA41 hr
Dec 23, 5:38 AM PSTWinter Storm WarningMFRModoc, Siskiyou4 days
Dec 23, 1:17 PM PSTWinter Storm WarningEKADel Norte, Humboldt, Lake, Mendocino, Trinity4 days
Dec 23, 10:03 PM PSTWinter Storm WarningSGXRiverside, San Bernardino14 hr
Dec 24, 9:00 PM PSTWinter Storm WarningSGXRiverside, San Bernardino32 hr
Dec 24, 9:20 PM PSTWinter Storm WarningLOX31 hr
Dec 26, 1:03 PM PSTWinter Storm WarningVEFInyo30 hr
Dec 26, 1:40 PM PSTWinter Storm WarningSGXRiverside, San Bernardino, San Diego37 hr
Dec 26, 2:19 PM PSTWinter Storm WarningLOX32 hr
Dec 28, 3:33 AM PSTWinter Storm WarningSTO42 hr
Dec 28, 1:26 PM PSTWinter Storm WarningSGXRiverside, San Bernardino, San Diego55 hr
Dec 28, 1:49 PM PSTWinter Storm WarningVEFInyo54 hr
Dec 28, 2:23 PM PSTWinter Storm WarningLOX54 hr

By county

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

Nearby

Alerts in force nowTornadoes on recordThe radar archive20202022

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. Rebuilt daily.