Alert archive / California / Frost Advisories in 2021
Frost Advisory 32, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Apr 26, 2021, 1:55 AM PDT for 5 counties in California. It took effect at Apr 27, 2021, 12:00 AM PDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Apr 26, 2021, 1:55 AM PDT (08:55 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 Del Norte County, CA, Humboldt County, CA, Lake County, CA, Mendocino County, CA, Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 75 km from the middle of the area, began a volume at 08:55 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, 8.9 hours before the alert went out and 233 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
- 1399 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- -13 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
404 WWUS76 KEKA 260855 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 155 AM PDT Mon Apr 26 2021 CAZ107-108-110-111-114-115-261700- /O.NEW.KEKA.FR.Y.0032.210427T0700Z-210427T1500Z/ /O.CON.KEKA.FR.Y.0031.210426T1000Z-210426T1600Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Northern Lake-Southern Lake- 155 AM PDT Mon Apr 26 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM PDT TUESDAY... * WHAT...Clear skies and a cold airmass will lead to morning low temperatures of 36 degrees or less. Frost formation is likely across low elevation communities and surrounding valleys. * WHERE...Northern Trinity, Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...For the first Frost Advisory, until 9 AM PDT this morning. For the second Frost Advisory, 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. && $$ CAZ102>106-109-112-113-261700- /O.NEW.KEKA.FR.Y.0032.210427T0700Z-210427T1500Z/ Del Norte Interior-Northern Humboldt Coast-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Mendocino Coast-Southwestern Mendocino Interior- Southeastern Mendocino Interior- 155 AM PDT Mon Apr 26 2021 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM PDT TUESDAY... * WHAT...Clear skies and a cold airmass will lead to morning low temperatures of 36 degrees or less. Frost formation is likely across low elevation communities and surrounding valleys. * WHERE...Del Norte Interior, Northern Humboldt Coast, Southwestern Humboldt, Northern Humboldt Interior, Southern Humboldt Interior, Mendocino Coast, Southwestern Mendocino Interior and Southeastern Mendocino Interior Counties. * WHEN...From midnight tonight to 8 AM PDT Tuesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
5 follow-up statements
108 WWUS76 KEKA 261602 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 902 AM PDT Mon Apr 26 2021 CAZ107-108-110-111-114-115-262200- /O.EXP.KEKA.FR.Y.0031.000000T0000Z-210426T1600Z/ /O.CON.KEKA.FR.Y.0032.210427T0700Z-210427T1500Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Northern Lake-Southern Lake- 902 AM PDT Mon Apr 26 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM PDT TUESDAY... ...FROST ADVISORY FOR THIS MORNING HAS EXPIRED... * WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...Northern Trinity, Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * 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. && $$ CAZ102>106-109-112-113-262200- /O.CON.KEKA.FR.Y.0032.210427T0700Z-210427T1500Z/ Del Norte Interior-Northern Humboldt Coast-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Mendocino Coast-Southwestern Mendocino Interior- Southeastern Mendocino Interior- 902 AM PDT Mon Apr 26 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM PDT TUESDAY... * WHAT...Clear skies and a cold airmass will lead to morning low temperatures of 36 degrees or less. Frost formation is likely across low elevation communities and surrounding valleys. * WHERE...Del Norte Interior, Northern Humboldt Coast, Southwestern Humboldt, Northern Humboldt Interior, Southern Humboldt Interior, Mendocino Coast, Southwestern Mendocino Interior and Southeastern Mendocino Interior. * WHEN...From midnight tonight to 8 AM PDT Tuesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
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. && $$
716 WWUS76 KEKA 270525 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1025 PM PDT Mon Apr 26 2021 CAZ107-108-111-114-271245- /O.CON.KEKA.FZ.W.0017.210427T0700Z-210427T1500Z/ Northern Trinity-Southern Trinity-Northeastern Mendocino Interior- Northern Lake- 1025 PM PDT Mon Apr 26 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM PDT TUESDAY... * WHAT...Sub-freezing temperatures as low as 30 expected. * WHERE...Northern Trinity, Southern Trinity, Northeastern Mendocino Interior and Northern Lake County. * WHEN...From midnight tonight to 8 AM PDT Tuesday. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ 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, 2:10 PM PDT | Freeze Warning | EKA | Lake, Mendocino, Trinity | 18 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.