Alert archive / California / Frost Advisories / 2021
Frost Advisories in California, December 2021
15 frost advisories 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 frost advisories reaches back to 2005.
Frost Advisories by county
Each county as a circle sized by its count in December 2021. Tap one for its archive.
- Frost Advisories
- 15
- Busiest day
- December 15, 20213 frost advisories
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 2, 2:47 PM PST | Frost Advisory | EKA | Mendocino | 18 hr |
| Dec 4, 2:08 PM PST | Frost Advisory | EKA | Humboldt, Mendocino | 19 hr |
| Dec 9, 2:45 AM PST | Frost Advisory | STO | 31 hr | |
| Dec 9, 12:54 PM PST | Frost Advisory | EKA | Del Norte, Humboldt | 20 hr |
| Dec 10, 3:08 AM PST | Frost Advisory | LOX | Los Angeles | 29 hr |
| Dec 14, 8:24 PM PST | Frost Advisory | SGX | Riverside, San Bernardino, San Diego | 13 hr |
| Dec 14, 8:26 PM PST | Frost Advisory | LOX | Los Angeles | 81 min |
| Dec 14, 9:47 PM PST | Frost Advisory | LOX | Los Angeles | 11 hr |
| Dec 16, 4:21 AM PST | Frost Advisory | EKA | Del Norte, Humboldt, Mendocino | 29 hr |
| Dec 17, 11:36 AM PST | Frost Advisory | SGX | Riverside, San Bernardino, San Diego | 20 hr |
| Dec 17, 8:35 PM PST | Frost Advisory | EKA | Humboldt, Mendocino | 12 hr |
| Dec 18, 12:08 AM PST | Frost Advisory | LOX | 9 hr | |
| Dec 18, 1:47 AM PST | Frost Advisory | SGX | Riverside, San Bernardino, San Diego | 30 hr |
| Dec 19, 2:28 AM PST | Frost Advisory | SGX | Riverside, San Bernardino, San Diego | 30 hr |
| Dec 27, 2:13 PM PST | Frost Advisory | LOX | Los Angeles | 18 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.