Alert archive / California / Freeze Watches in 2021
Freeze Watch 4, NWS Eureka, CA
NWS Eureka, CA issued this freeze watch at Mar 29, 2021, 3:51 AM PDT for Lake County, Mendocino County, California. It took effect at Mar 29, 2021, 11:00 PM PDT. It was in force for .
The area
The counties it named.
The facts
- Issued
- Mar 29, 2021, 3:51 AM PDT (10:51 UTC)
- In effect from
- Mar 29, 2021, 11:00 PM PDT
- Expired
- Mar 29, 2021, 2:24 PM PDT
- In force
- 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 10:57 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, 10.9 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
- 3471 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 45 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
321 WWUS76 KEKA 291051 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 351 AM PDT Mon Mar 29 2021 CAZ110-111-114-115-291900- /O.NEW.KEKA.FZ.A.0004.210330T0600Z-210330T1500Z/ /O.CON.KEKA.FR.Y.0019.000000T0000Z-210329T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake-Southern Lake- 351 AM PDT Mon Mar 29 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... ...FREEZE WATCH IN EFFECT FROM THIS EVENING THROUGH TUESDAY MORNING... * WHAT...For the Frost Advisory, temperatures as low as 32 will result in frost formation. For the Freeze Watch, sub-freezing temperatures as low as 29 possible. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...For the Frost Advisory, until 9 AM PDT this morning. For the Freeze Watch, from this evening through Tuesday morning. * IMPACTS...Frost and freeze conditions could 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. && $$ CAZ112-113-291600- /O.CON.KEKA.FR.Y.0019.000000T0000Z-210329T1600Z/ Southwestern Mendocino Interior-Southeastern Mendocino Interior- 351 AM PDT Mon Mar 29 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Temperatures as low as 36 will result in frost formation. * WHERE...Southwestern Mendocino Interior and Southeastern Mendocino Interior Counties. * WHEN...Until 9 AM PDT this morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
2 follow-up statements
159 WWUS76 KEKA 291545 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 845 AM PDT Mon Mar 29 2021 CAZ110-111-114-115-292345- /O.EXP.KEKA.FR.Y.0019.000000T0000Z-210329T1600Z/ /O.CON.KEKA.FZ.A.0004.210330T0600Z-210330T1500Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake-Southern Lake- 845 AM PDT Mon Mar 29 2021 ...FREEZE WATCH REMAINS IN EFFECT FROM THIS EVENING THROUGH TUESDAY MORNING... ...FROST ADVISORY WILL EXPIRE AT 9 AM PDT THIS MORNING... * WHAT...Sub-freezing temperatures as low as 29 possible. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...From this evening through Tuesday morning. * IMPACTS...Frost and freeze conditions could 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. && $$ CAZ112-113-291645- /O.EXP.KEKA.FR.Y.0019.000000T0000Z-210329T1600Z/ Southwestern Mendocino Interior-Southeastern Mendocino Interior- 845 AM PDT Mon Mar 29 2021 ...FROST ADVISORY WILL EXPIRE AT 9 AM PDT THIS MORNING... $$
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. && $$ CAZ101-109-113-300530- /O.NEW.KEKA.FR.Y.0020.210330T0800Z-210330T1600Z/ Coastal Del Norte-Mendocino Coast-Southeastern Mendocino Interior- 224 PM PDT Mon Mar 29 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM PDT TUESDAY... * WHAT...Temperatures in the low to mid 30s will result in frost formation. * WHERE...Sheltered inland portions of Coastal Del Norte, Mendocino Coast and much of the Southeastern Mendocino County Interior. * WHEN...From 1 AM to 9 AM PDT Tuesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 29, 2:24 PM PDT | Frost Advisory | EKA | Del Norte, Mendocino | 19 hr |
| Mar 29, 2:24 PM PDT | Freeze Warning | EKA | Humboldt, Lake, Mendocino | 19 hr |
Nearby
Freeze Watches in California, 2021Every freeze watch 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.