Alert archive / California / Freeze Warnings / 2021
Freeze Warnings in California, December 2021
12 freeze 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 freeze warnings reaches back to 2005.
Freeze Warnings by county
Each county as a circle sized by its count in December 2021. Tap one for its archive.
- Freeze Warnings
- 12
- Busiest day
- December 10, 20216 freeze 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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 9, 3:23 AM PST | Freeze Warning | EKA | Humboldt, Mendocino | 30 hr |
| Dec 10, 1:05 AM PST | Freeze Warning | VEF | San Bernardino | 31 hr |
| Dec 10, 1:13 AM PST | Freeze Warning | PSR | Imperial, Riverside, San Bernardino | 31 hr |
| Dec 10, 2:00 AM PST | Freeze Warning | HNX | Fresno, Kern, Kings, Madera, Mariposa, Merced and 1 more | 31 hr |
| Dec 10, 3:08 AM PST | Freeze Warning | LOX | Santa Barbara | 29 hr |
| Dec 10, 1:42 PM PST | Freeze Warning | MTR | Marin, Monterey, Napa, San Benito, Sonoma | 18 hr |
| Dec 10, 2:59 PM PST | Freeze Warning | EKA | Humboldt, Lake, Mendocino | 18 hr |
| Dec 11, 1:23 PM PST | Freeze Warning | PSR | Imperial, Riverside | 19 hr |
| Dec 11, 5:35 PM PST | Freeze Warning | MTR | Monterey, San Benito | 14 hr |
| Dec 14, 9:47 PM PST | Freeze Warning | LOX | Los Angeles | 11 hr |
| Dec 18, 12:08 AM PST | Freeze Warning | LOX | 9 hr | |
| Dec 29, 3:24 AM PST | Freeze Warning | EKA | Del Norte, Humboldt, Mendocino | 30 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Humboldt County3
- Mendocino County3
- San Bernardino County2
- Imperial County2
- Riverside County2
- Monterey County2
- San Benito County2
- Fresno County1
- Kern County1
- Kings County1
- Madera County1
- Mariposa County1
- Merced County1
- Tulare County1
- Santa Barbara County1
- Marin County1
- Napa County1
- Sonoma County1
- Lake County1
- Los Angeles County1
- Del Norte County1
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.