Alert archive / California / Frost Advisories in 2021
Frost Advisory 14, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Mar 22, 2021, 3:28 AM PDT for Del Norte County, Humboldt County, Mendocino County, California. It took effect at Mar 23, 2021, 1:00 AM PDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Mar 22, 2021, 3:28 AM PDT (10:28 UTC)
- In effect from
- Mar 23, 2021, 1:00 AM PDT
- Expired
- Mar 23, 2021, 9:00 AM PDT
- In force
- 8 hr
- Issued by
- NWS Eureka, CA
Counties Del Norte County, CA, Humboldt County, CA, Mendocino County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 47 km from the middle of the area, began a volume at 10:28 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
Medford/Jackson, OR (KMFR), launched 00:00Z, 10.5 hours before the alert went out and 210 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
- 1734 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 90 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
590 WWUS76 KEKA 221028 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 328 AM PDT Mon Mar 22 2021 CAZ110-111-114-221830- /O.NEW.KEKA.FZ.W.0013.210323T0800Z-210323T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 328 AM PDT Mon Mar 22 2021 ...FREEZE WARNING IN EFFECT FROM 1 AM TO 9 AM PDT TUESDAY... * WHAT...Sub-freezing temperatures in the low 30s and upper 20s expected. * WHERE...Portions of the 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. && $$ CAZ101-103-109-112-113-115-221830- /O.NEW.KEKA.FR.Y.0014.210323T0800Z-210323T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 328 AM PDT Mon Mar 22 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM PDT TUESDAY... * WHAT...Temperatures in the low to mid 30s will result in frost formation. * WHERE...Portions of Coastal Del Norte, Northern Humboldt Coast, Mendocino Coast, Southwestern Mendocino Interior, Southeastern Mendocino Interior and Southern Lake Counties. * WHEN...From 1 AM to 9 AM PDT Tuesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
3 follow-up statements
796 WWUS76 KEKA 221918 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1218 PM PDT Mon Mar 22 2021 CAZ110-111-114-230330- /O.CON.KEKA.FZ.W.0013.210323T0800Z-210323T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 1218 PM PDT Mon Mar 22 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM 1 AM TO 9 AM PDT TUESDAY... * WHAT...Sub-freezing temperatures in the low 30s and upper 20s expected. * WHERE...Portions of the 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. && $$ CAZ101-103-109-112-113-115-230330- /O.CON.KEKA.FR.Y.0014.210323T0800Z-210323T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 1218 PM PDT Mon Mar 22 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM PDT TUESDAY... * WHAT...Temperatures in the low to mid 30s will result in frost formation. * WHERE...Portions of Coastal Del Norte, Northern Humboldt Coast, Mendocino Coast, Southwestern Mendocino Interior, Southeastern Mendocino Interior and Southern Lake Counties. * WHEN...From 1 AM to 9 AM PDT Tuesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
535 WWUS76 KEKA 230329 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 829 PM PDT Mon Mar 22 2021 CAZ110-111-114-231600- /O.CON.KEKA.FZ.W.0013.210323T0800Z-210323T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 829 PM PDT Mon Mar 22 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM 1 AM TO 9 AM TUESDAY... * WHAT...Sub-freezing temperatures in the upper 20s to lower 30s expected. * WHERE...Portions of Northwestern Mendocino Interior, Northeastern Mendocino Interior, and Northern Lake counties. * WHEN...From 1 AM to 9 AM 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. $$ CAZ101-103-109-112-113-115-231600- /O.CON.KEKA.FR.Y.0014.210323T0800Z-210323T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 829 PM PDT Mon Mar 22 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM TUESDAY... * WHAT...Temperatures in the lower to mid 30s will result in frost formation. * WHERE...Portions of Coastal Del Norte, Northern Humboldt Coast, Mendocino Coast, Southwestern Mendocino Interior, Southeastern Mendocino Interior and Southern Lake counties. * WHEN...From 1 AM to 9 AM Tuesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. $$
995 WWUS76 KEKA 231543 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 843 AM PDT Tue Mar 23 2021 CAZ110-111-114-231645- /O.EXP.KEKA.FZ.W.0013.000000T0000Z-210323T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 843 AM PDT Tue Mar 23 2021 ...FREEZE WARNING WILL EXPIRE AT 9 AM PDT THIS MORNING... $$ CAZ101-103-109-112-113-115-231645- /O.EXP.KEKA.FR.Y.0014.000000T0000Z-210323T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 843 AM PDT Tue Mar 23 2021 ...FROST ADVISORY WILL EXPIRE AT 9 AM PDT THIS MORNING... $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 22, 3:10 AM PDT | Gale Watch | EKA | 11 hr | |
| Mar 22, 3:10 AM PDT | Small Craft Advisory | EKA | 4 days | |
| Mar 22, 3:28 AM PDT | Freeze Warning | EKA | Lake, Mendocino | 30 hr |
| Mar 22, 2:17 PM PDT | Gale Warning | EKA | 37 hr |
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.