Alert archive / California / Frost Advisories in 2021
Frost Advisory 56, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Dec 2, 2021, 2:47 PM PST for Mendocino County, California. It took effect at Dec 3, 2021, 12:00 AM PST. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Dec 2, 2021, 2:47 PM PST (22:47 UTC)
- In effect from
- Dec 3, 2021, 12:00 AM PST
- Expired
- Dec 3, 2021, 9:00 AM PST
- In force
- 9 hr
- Issued by
- NWS Eureka, CA
County Mendocino County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 139 km from the middle of the area, began a volume at 22:53 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Oakland, CA (KOAK), launched 12:00Z, 10.8 hours before the alert went out and 218 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2387 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- -3 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
958 WWUS76 KEKA 022247 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 247 PM PST Thu Dec 2 2021 CAZ112-113-115-030700- /O.NEW.KEKA.FR.Y.0056.211203T0800Z-211203T1700Z/ Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 247 PM PST Thu Dec 2 2021 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PST FRIDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Southwestern Mendocino Interior, Southeastern Mendocino Interior and Southern Lake Counties. * WHEN...From midnight tonight to 9 AM PST Friday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
2 follow-up statements
412 WWUS76 KEKA 030646 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1046 PM PST Thu Dec 2 2021 CAZ112-113-115-031700- /O.CON.KEKA.FR.Y.0056.211203T0800Z-211203T1700Z/ Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 1046 PM PST Thu Dec 2 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST FRIDAY... * WHAT...Temperatures as low as 35 will result in patchy frost formation. * WHERE...Colder sheltered spots in the Southwestern Mendocino Interior, Southeastern Mendocino Interior and Southern Lake Counties. * WHEN...Until 9 AM PST Friday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
584 WWUS76 KEKA 031659 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 859 AM PST Fri Dec 3 2021 CAZ112-113-115-031800- /O.EXP.KEKA.FR.Y.0056.000000T0000Z-211203T1700Z/ Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 859 AM PST Fri Dec 3 2021 ...FROST ADVISORY WILL EXPIRE AT 9 AM PST THIS MORNING... $$
Nearby
Frost Advisories in California, 2021Every frost advisory in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.