Alert archive / California / Freeze Warnings in 2021
Freeze Warning 16, NWS Eureka, CA
NWS Eureka, CA issued this freeze warning at Mar 29, 2021, 2:24 PM PDT for Humboldt County, Lake County, Mendocino County, California. It took effect at Mar 30, 2021, 1:00 AM PDT. It was in force for 8 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
- Mar 29, 2021, 2:24 PM PDT (21:24 UTC)
- In effect from
- Mar 30, 2021, 1:00 AM PDT
- Expired
- Mar 30, 2021, 9:00 AM PDT
- In force
- 8 hr
- Issued by
- NWS Eureka, CA
Counties Humboldt County, CA, Lake County, CA, Mendocino County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 115 km from the middle of the area, began a volume at 21:27 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, 9.4 hours before the alert went out and 246 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
- 1760 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 87 m²/s²
- 0-3 km storm-relative helicity
- 92 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
927 WWUS76 KEKA 292124 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 224 PM PDT Mon Mar 29 2021 CAZ110-111-114-300530- /O.UPG.KEKA.FZ.A.0004.210330T0600Z-210330T1500Z/ /O.NEW.KEKA.FZ.W.0016.210330T0800Z-210330T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 224 PM PDT Mon Mar 29 2021 ...FREEZE WARNING IN EFFECT FROM 1 AM TO 9 AM PDT TUESDAY... * WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior and Northern Lake Counties. * WHEN...From 1 AM to 9 AM PDT Tuesday. * 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. && $$ CAZ103-112-300530- /O.NEW.KEKA.FZ.W.0016.210330T0800Z-210330T1600Z/ Northern Humboldt Coast-Southwestern Mendocino Interior- 224 PM PDT Mon Mar 29 2021 ...FREEZE WARNING IN EFFECT FROM 1 AM TO 9 AM PDT TUESDAY... * WHAT...Sub-freezing temperatures in the low 30s expected. * WHERE...Sheltered portions of the Northern Humboldt Coast and Southwestern Mendocino Interior. * WHEN...From 1 AM to 9 AM PDT Tuesday. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ115-300530- /O.UPG.KEKA.FZ.A.0004.210330T0600Z-210330T1500Z/ /O.NEW.KEKA.FR.Y.0020.210330T0800Z-210330T1600Z/ Southern Lake- 224 PM PDT Mon Mar 29 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM PDT TUESDAY... * WHAT...Temperatures in the low to mid 30s will result in frost formation. * WHERE...Southern Lake County. * WHEN...From 1 AM to 9 AM PDT Tuesday. * 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. && $$ CAZ101-109-113-300530- /O.NEW.KEKA.FR.Y.0020.210330T0800Z-210330T1600Z/ Coastal Del Norte-Mendocino Coast-Southeastern Mendocino Interior- 224 PM PDT Mon Mar 29 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM PDT TUESDAY... * WHAT...Temperatures in the low to mid 30s will result in frost formation. * WHERE...Sheltered inland portions of Coastal Del Norte, Mendocino Coast and much of the Southeastern Mendocino County Interior. * WHEN...From 1 AM to 9 AM PDT Tuesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
2 follow-up statements
257 WWUS76 KEKA 300528 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1028 PM PDT Mon Mar 29 2021 CAZ103-110>112-114-301600- /O.CON.KEKA.FZ.W.0016.210330T0800Z-210330T1600Z/ Northern Humboldt Coast-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southwestern Mendocino Interior- Northern Lake- 1028 PM PDT Mon Mar 29 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT TUESDAY... * WHAT...Sub-freezing temperatures in the low 30s expected. * WHERE...Sheltered portions of the Northern Humboldt Coast, Southwestern Mendocino Interior, and northern Lake County. * WHEN...From 1 AM to 9 AM PDT Tuesday. * 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. && $$ CAZ101-109-113-115-301600- /O.CON.KEKA.FR.Y.0020.210330T0800Z-210330T1600Z/ Coastal Del Norte-Mendocino Coast-Southeastern Mendocino Interior- Southern Lake- 1028 PM PDT Mon Mar 29 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT TUESDAY... * WHAT...Temperatures in the low to mid 30s will result in frost formation. * WHERE...Sheltered inland portions of Coastal Del Norte, Mendocino Coast, much of the Southeastern Mendocino County Interior, and southern Lake County. * WHEN...From 1 AM to 9 AM PDT Tuesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
425 WWUS76 KEKA 301559 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 859 AM PDT Tue Mar 30 2021 CAZ103-110>112-114-301700- /O.EXP.KEKA.FZ.W.0016.000000T0000Z-210330T1600Z/ Northern Humboldt Coast-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southwestern Mendocino Interior- Northern Lake- 859 AM PDT Tue Mar 30 2021 ...FREEZE WARNING WILL EXPIRE AT 9 AM PDT THIS MORNING... $$ CAZ101-109-113-115-301700- /O.EXP.KEKA.FR.Y.0020.000000T0000Z-210330T1600Z/ Coastal Del Norte-Mendocino Coast-Southeastern Mendocino Interior- Southern Lake- 859 AM PDT Tue Mar 30 2021 ...FROST ADVISORY WILL EXPIRE AT 9 AM PDT THIS MORNING... $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 29, 3:51 AM PDT | Freeze Watch | EKA | Lake, Mendocino | 11 hr |
| Mar 29, 2:24 PM PDT | Frost Advisory | EKA | Del Norte, Mendocino | 19 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.