Alert archive / California / Freeze Warnings in 2021
Freeze Warning 17, NWS Eureka, CA
NWS Eureka, CA issued this freeze warning at Apr 26, 2021, 2:10 PM PDT for Lake County, Mendocino County, Trinity County, California. It took effect at Apr 27, 2021, 12:00 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
- Apr 26, 2021, 2:10 PM PDT (21:10 UTC)
- In effect from
- Apr 27, 2021, 12:00 AM PDT
- Expired
- Apr 27, 2021, 8:00 AM PDT
- In force
- 8 hr
- Issued by
- NWS Eureka, CA
Counties Lake County, CA, Mendocino County, CA, Trinity County, CA
The radar
The Beale AFB radar (KBBX), 128 km from the middle of the area, began a volume at 21:11 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 235 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 690 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 30 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
365 WWUS76 KEKA 262110 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 210 PM PDT Mon Apr 26 2021 CAZ102-103-109-112-113-262215- /O.CAN.KEKA.FR.Y.0032.210427T0700Z-210427T1500Z/ Del Norte Interior-Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- 210 PM PDT Mon Apr 26 2021 ...FROST ADVISORY IS CANCELLED... Temperatures are expected to remain in the upper 30s in these locations. $$ CAZ107-108-111-114-270600- /O.UPG.KEKA.FR.Y.0032.210427T0700Z-210427T1500Z/ /O.NEW.KEKA.FZ.W.0017.210427T0700Z-210427T1500Z/ Northern Trinity-Southern Trinity-Northeastern Mendocino Interior- Northern Lake- 210 PM PDT Mon Apr 26 2021 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM PDT TUESDAY... * WHAT...Sub-freezing temperatures as low as 30 expected. * WHERE...Northern Trinity, Southern Trinity, Northeastern Mendocino Interior and Northern Lake County. * WHEN...From midnight tonight to 8 AM PDT Tuesday. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ104>106-110-115-270600- /O.CON.KEKA.FR.Y.0032.210427T0700Z-210427T1500Z/ Southwestern Humboldt-Northern Humboldt Interior- Southern Humboldt Interior-Northwestern Mendocino Interior- Southern Lake- 210 PM PDT Mon Apr 26 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM PDT TUESDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Northwestern Mendocino Interior, Northern Humboldt Interior, Southwestern Humboldt, Southern Humboldt Interior and Southern Lake County. * WHEN...From midnight tonight to 8 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. && $$
3 follow-up statements
716 WWUS76 KEKA 270525 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1025 PM PDT Mon Apr 26 2021 CAZ107-108-111-114-271245- /O.CON.KEKA.FZ.W.0017.210427T0700Z-210427T1500Z/ Northern Trinity-Southern Trinity-Northeastern Mendocino Interior- Northern Lake- 1025 PM PDT Mon Apr 26 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM PDT TUESDAY... * WHAT...Sub-freezing temperatures as low as 30 expected. * WHERE...Northern Trinity, Southern Trinity, Northeastern Mendocino Interior and Northern Lake County. * WHEN...From midnight tonight to 8 AM PDT Tuesday. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ104>106-110-115-271245- /O.CON.KEKA.FR.Y.0032.210427T0700Z-210427T1500Z/ Southwestern Humboldt-Northern Humboldt Interior- Southern Humboldt Interior-Northwestern Mendocino Interior- Southern Lake- 1025 PM PDT Mon Apr 26 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PDT TUESDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Northwestern Mendocino Interior, Northern Humboldt Interior, Southwestern Humboldt, Southern Humboldt Interior and Southern Lake County. * WHEN...From midnight tonight to 8 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. && $$
243 WWUS76 KEKA 271020 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 320 AM PDT Tue Apr 27 2021 CAZ107-108-111-114-271500- /O.CON.KEKA.FZ.W.0017.000000T0000Z-210427T1500Z/ Northern Trinity-Southern Trinity-Northeastern Mendocino Interior- Northern Lake- 320 AM PDT Tue Apr 27 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM PDT THIS MORNING... * WHAT...Sub-freezing temperatures as low as 26. * WHERE...Southern Trinity, Northeastern Mendocino Interior, Northern Trinity and Northern Lake Counties. * WHEN...Until 8 AM PDT this morning. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ104>106-110-115-271500- /O.CON.KEKA.FR.Y.0032.000000T0000Z-210427T1500Z/ Southwestern Humboldt-Northern Humboldt Interior- Southern Humboldt Interior-Northwestern Mendocino Interior- Southern Lake- 320 AM PDT Tue Apr 27 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PDT THIS MORNING... * WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...Northwestern Mendocino Interior, Northern Humboldt Interior, Southwestern Humboldt, Southern Humboldt Interior and Southern Lake Counties. * WHEN...Until 8 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. && $$
414 WWUS76 KEKA 271445 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 745 AM PDT Tue Apr 27 2021 CAZ107-108-111-114-271545- /O.EXP.KEKA.FZ.W.0017.000000T0000Z-210427T1500Z/ Northern Trinity-Southern Trinity-Northeastern Mendocino Interior- Northern Lake- 745 AM PDT Tue Apr 27 2021 ...FREEZE WARNING WILL EXPIRE AT 8 AM PDT THIS MORNING... $$ CAZ104>106-110-115-271545- /O.EXP.KEKA.FR.Y.0032.000000T0000Z-210427T1500Z/ Southwestern Humboldt-Northern Humboldt Interior- Southern Humboldt Interior-Northwestern Mendocino Interior- Southern Lake- 745 AM PDT Tue Apr 27 2021 ...FROST ADVISORY WILL EXPIRE AT 8 AM PDT THIS MORNING... $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 10:34 PM PDT | Frost Advisory | EKA | Lake, Mendocino, Trinity | 10 hr |
| Apr 26, 1:55 AM PDT | Frost Advisory | EKA | Del Norte, Humboldt, Lake, Mendocino, Trinity | 30 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.