Alert archive / California / Winter Storm Watches / 2021

Winter Storm Watches in California, December 2021

36 winter storm watches 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 watches reaches back to 2005.

Winter Storm Watches by county

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

Winter Storm Watches
36
Busiest day
December 9, 20214 winter storm watches

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 6, 2:08 PM PSTWinter Storm WatchSTO23 hr
Dec 6, 3:12 PM PSTWinter Storm WatchREVAlpine, El Dorado, Lassen, Modoc, Mono, Nevada and 3 more23 hr
Dec 9, 1:38 PM PSTWinter Storm WatchSTO25 hr
Dec 9, 1:41 PM PSTWinter Storm WatchREVAlpine, El Dorado, Lassen, Mono, Nevada, Placer and 2 more37 hr
Dec 9, 2:13 PM PSTWinter Storm WatchEKAHumboldt, Trinity63 hr
Dec 9, 3:10 PM PSTWinter Storm WatchMFRSiskiyou38 hr
Dec 10, 3:35 AM PSTWinter Storm WatchHNXFresno, Kern, Madera, Mariposa, Tulare, Tuolumne34 hr
Dec 10, 1:32 PM PSTWinter Storm WatchVEFInyo36 hr
Dec 11, 2:54 AM PSTWinter Storm WatchREVModoc36 hr
Dec 12, 3:13 AM PSTWinter Storm WatchSGXRiverside, San Bernardino25 hr
Dec 12, 3:19 AM PSTWinter Storm WatchLOX22 hr
Dec 12, 12:40 PM PSTWinter Storm WatchHNXKern26 hr
Dec 13, 2:25 PM PSTWinter Storm WatchEKADel Norte, Humboldt, Lake, Mendocino, Trinity24 hr
Dec 14, 2:42 AM PSTWinter Storm WatchMFRSiskiyou12 hr
Dec 14, 3:48 AM PSTWinter Storm WatchSTO11 hr
Dec 14, 5:10 AM PSTWinter Storm WatchREVAlpine, El Dorado, Lassen, Mono, Nevada, Placer and 2 more9 hr
Dec 14, 12:34 PM PSTWinter Storm WatchHNXFresno, Madera, Mariposa, Tulare, Tuolumne20 hr
Dec 19, 12:58 PM PSTWinter Storm WatchREVAlpine, El Dorado, Lassen, Mono, Nevada, Placer and 2 more26 hr
Dec 19, 1:08 PM PSTWinter Storm WatchHNXFresno, Kern, Madera, Mariposa, Tulare, Tuolumne26 hr
Dec 19, 2:02 PM PSTWinter Storm WatchSTO25 hr
Dec 20, 12:57 AM PSTWinter Storm WatchVEFInyo24 hr
Dec 20, 2:24 AM PSTWinter Storm WatchEKA35 hr
Dec 20, 6:47 AM PSTWinter Storm WatchMFRSiskiyou21 hr
Dec 22, 4:32 AM PSTWinter Storm WatchMFRSiskiyou65 hr
Dec 23, 2:10 AM PSTWinter Storm WatchEKADel Norte, Humboldt, Lake, Mendocino, Trinity11 hr
Dec 24, 3:18 AM PSTWinter Storm WatchHNXFresno, Kern, Madera, Mariposa, Tulare25 hr
Dec 24, 7:48 AM PSTWinter Storm WatchLOX14 hr
Dec 24, 10:01 AM PSTWinter Storm WatchEKADel Norte, Humboldt, Mendocino43 hr
Dec 24, 12:00 PM PSTWinter Storm WatchSGXRiverside, San Bernardino9 hr
Dec 25, 3:49 AM PSTWinter Storm WatchHNXFresno, Kern, Madera, Mariposa, Tulare23 hr
Dec 25, 1:40 PM PSTWinter Storm WatchSGXRiverside, San Bernardino, San Diego24 hr
Dec 26, 3:59 AM PSTWinter Storm WatchLOX10 hr
Dec 27, 9:07 PM PSTWinter Storm WatchSTO6 hr
Dec 28, 2:37 AM PSTWinter Storm WatchLOX12 hr
Dec 28, 3:00 AM PSTWinter Storm WatchSGXRiverside, San Bernardino, San Diego10 hr
Dec 28, 3:14 AM PSTWinter Storm WatchVEFInyo11 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. Warning verification from the Mesonet's Cow. Rebuilt daily.