Alert archive / California / Freeze Warnings in 2021
Freeze Warning 15, NWS Eureka, CA
NWS Eureka, CA issued this freeze warning at Mar 25, 2021, 2:12 PM PDT for Lake County, Mendocino County, California. It took effect at Mar 26, 2021, 12:00 AM PDT. 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
- Mar 25, 2021, 2:12 PM PDT (21:12 UTC)
- In effect from
- Mar 26, 2021, 12:00 AM PDT
- Expired
- Mar 26, 2021, 9:00 AM PDT
- In force
- 9 hr
- Issued by
- NWS Eureka, CA
Counties Lake County, CA, Mendocino County, CA
The radar
The Beale AFB radar (KBBX), 128 km from the middle of the area, began a volume at 21:16 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, 9.2 hours before the alert went out and 188 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
- 752 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 129 m²/s²
- 0-3 km storm-relative helicity
- 114 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
106 WWUS76 KEKA 252112 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 212 PM PDT Thu Mar 25 2021 CAZ110-111-114-260515- /O.NEW.KEKA.FZ.W.0015.210326T0700Z-210326T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 212 PM PDT Thu Mar 25 2021 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT FRIDAY... * WHAT...Sub-freezing temperatures as low as 30 expected. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior and Northern Lake Counties. * WHEN...From midnight tonight to 9 AM PDT Friday. * 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. && $$ CAZ101-103-109-112-113-115-260515- /O.NEW.KEKA.FR.Y.0017.210326T0700Z-210326T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 212 PM PDT Thu Mar 25 2021 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT FRIDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Coastal Del Norte, Northern Humboldt Coast, Mendocino Coast, Southwestern Mendocino Interior, Southeastern Mendocino Interior and Southern Lake Counties. * WHEN...From midnight tonight to 9 AM PDT Friday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
2 follow-up statements
184 WWUS76 KEKA 260517 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1017 PM PDT Thu Mar 25 2021 CAZ110-111-114-261600- /O.CON.KEKA.FZ.W.0015.210326T0700Z-210326T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 1017 PM PDT Thu Mar 25 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM FRIDAY... * WHAT...Sub-freezing temperatures as low as 30 expected. * WHERE...Northeastern Mendocino Interior, Northern Lake, and Northwestern Mendocino Interior counties. * WHEN...Until 9 AM Friday. * 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. $$ CAZ101-103-109-112-113-115-261600- /O.CON.KEKA.FR.Y.0017.210326T0700Z-210326T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 1017 PM PDT Thu Mar 25 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM FRIDAY... * WHAT...Temperatures as low as 35 will result in frost formation. * WHERE...Mendocino Coast, Coastal Del Norte, Southeastern Mendocino Interior, Northern Humboldt Coast, Southern Lake, and Southwestern Mendocino Interior counties. * WHEN...Until 9 AM Friday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. $$
048 WWUS76 KEKA 261545 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 845 AM PDT Fri Mar 26 2021 CAZ110-111-114-261645- /O.EXP.KEKA.FZ.W.0015.000000T0000Z-210326T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 845 AM PDT Fri Mar 26 2021 ...FREEZE WARNING WILL EXPIRE AT 9 AM PDT THIS MORNING... $$ CAZ101-103-109-112-113-115-261645- /O.EXP.KEKA.FR.Y.0017.000000T0000Z-210326T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 845 AM PDT Fri Mar 26 2021 ...FROST ADVISORY WILL EXPIRE AT 9 AM PDT THIS MORNING... $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 25, 2:05 AM PDT | Gale Warning | EKA | 28 hr | |
| Mar 25, 2:12 PM PDT | Frost Advisory | EKA | Del Norte, Humboldt, 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.