Alert archive / California / Freeze Warnings in 2021
Freeze Warning 22, NWS Eureka, CA
NWS Eureka, CA issued this freeze warning at Nov 21, 2021, 10:25 PM PST for Mendocino County, California. It took effect at Nov 22, 2021, 1:00 AM PST. It was in force for 9 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Nov 21, 2021, 10:25 PM PST (06:25 UTC)
- In effect from
- Nov 22, 2021, 1:00 AM PST
- Expired
- Nov 22, 2021, 10:00 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 06:26 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 00:00Z, 6.4 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
- 2104 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 66 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
651 WWUS76 KEKA 220625 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1025 PM PST Sun Nov 21 2021 CAZ111-221430- /O.UPG.KEKA.FR.Y.0052.211122T0900Z-211122T1800Z/ /O.NEW.KEKA.FZ.W.0022.211122T0900Z-211122T1800Z/ Northeastern Mendocino Interior- 1025 PM PST Sun Nov 21 2021 ...FREEZE WARNING IN EFFECT UNTIL 10 AM PST MONDAY... * WHAT...Sub-freezing temperatures as low as the upper 20s expected. * WHERE...Northeastern Mendocino Interior County. * WHEN...Until 10 AM PST Monday. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. 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. && $$ CAZ106-110-112-113-115-221430- /O.CON.KEKA.FR.Y.0052.211122T0900Z-211122T1800Z/ Southern Humboldt Interior-Northwestern Mendocino Interior- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 1025 PM PST Sun Nov 21 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST MONDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Southwestern Mendocino Interior, Southeastern Mendocino Interior, Northwestern Mendocino Interior, Southern Humboldt Interior and Southern Lake Counties. * WHEN...Until 10 AM PST Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
3 follow-up statements
809 WWUS76 KEKA 220643 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1043 PM PST Sun Nov 21 2021 CAZ111-221445- /O.CON.KEKA.FZ.W.0022.211122T0900Z-211122T1800Z/ Northeastern Mendocino Interior- 1043 PM PST Sun Nov 21 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 10 AM PST MONDAY... * WHAT...Sub-freezing temperatures as low as the upper 20s expected. * WHERE...Northeastern Mendocino Interior County. * WHEN...Until 10 AM PST Monday. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. 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. && $$ CAZ101>103-105-221445- /O.EXA.KEKA.FR.Y.0052.211122T0900Z-211122T1800Z/ Coastal Del Norte-Del Norte Interior-Northern Humboldt Coast- Northern Humboldt Interior- 1043 PM PST Sun Nov 21 2021 ...FROST ADVISORY IN EFFECT UNTIL 10 AM PST MONDAY... * WHAT...Temperatures as low as the middle 30s will result in frost formation. * WHERE...Coastal Del Norte, Del Norte Interior, Northern Humboldt Coast and Northern Humboldt Interior Counties. * WHEN...Until 10 AM PST Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ106-110-112-113-115-221445- /O.CON.KEKA.FR.Y.0052.211122T0900Z-211122T1800Z/ Southern Humboldt Interior-Northwestern Mendocino Interior- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 1043 PM PST Sun Nov 21 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST MONDAY... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Southeastern Mendocino Interior, Southern Humboldt Interior, Southwestern Mendocino Interior, Southern Lake and Northwestern Mendocino Interior Counties. * WHEN...Until 10 AM PST Monday. * 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. && $$
804 WWUS76 KEKA 221027 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 227 AM PST Mon Nov 22 2021 CAZ111-221800- /O.CON.KEKA.FZ.W.0022.000000T0000Z-211122T1800Z/ Northeastern Mendocino Interior- 227 AM PST Mon Nov 22 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 10 AM PST THIS MORNING... * WHAT...Sub-freezing temperatures as low as the upper 20s. * WHERE...Northeastern Mendocino Interior County. * WHEN...Until 10 AM PST this morning. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ101>103-105-106-110-112-113-115-221800- /O.CON.KEKA.FR.Y.0052.000000T0000Z-211122T1800Z/ Coastal Del Norte-Del Norte Interior-Northern Humboldt Coast- Northern Humboldt Interior-Southern Humboldt Interior- Northwestern Mendocino Interior-Southwestern Mendocino Interior- Southeastern Mendocino Interior-Southern Lake- 227 AM PST Mon Nov 22 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST THIS MORNING... * WHAT...Temperatures as low as the middle 30s will result in frost formation. * WHERE...Del Norte Interior, Coastal Del Norte, Southeastern Mendocino Interior, Northern Humboldt Coast, Northern Humboldt Interior, Southern Humboldt Interior, Southwestern Mendocino Interior, Southern Lake and Northwestern Mendocino Interior Counties. * WHEN...Until 10 AM PST this morning. * 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. && $$
603 WWUS76 KEKA 221754 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 954 AM PST Mon Nov 22 2021 CAZ111-221900- /O.EXP.KEKA.FZ.W.0022.000000T0000Z-211122T1800Z/ Northeastern Mendocino Interior- 954 AM PST Mon Nov 22 2021 ...FREEZE WARNING WILL EXPIRE AT 10 AM PST THIS MORNING... $$ CAZ101>103-105-106-110-112-113-115-221900- /O.EXP.KEKA.FR.Y.0052.000000T0000Z-211122T1800Z/ Coastal Del Norte-Del Norte Interior-Northern Humboldt Coast- Northern Humboldt Interior-Southern Humboldt Interior- Northwestern Mendocino Interior-Southwestern Mendocino Interior- Southeastern Mendocino Interior-Southern Lake- 954 AM PST Mon Nov 22 2021 ...FROST ADVISORY WILL EXPIRE AT 10 AM PST THIS MORNING... $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 22, 8:23 AM PST | Gale Warning | EKA | 42 hr | |
| Nov 22, 2:04 PM PST | Freeze Watch | EKA | Del Norte, Humboldt | 12 hr |
Nearby
Freeze Warnings in California, 2021Every freeze warning 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.