Alert archive / California / Frost Advisories in 2021
Frost Advisory 42, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Sep 27, 2021, 3:15 AM PDT for Lake County, Mendocino County, Trinity County, California. It took effect at Sep 28, 2021, 2:00 AM PDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Sep 27, 2021, 3:15 AM PDT (10:15 UTC)
- In effect from
- Sep 28, 2021, 2:00 AM PDT
- Expired
- Sep 28, 2021, 9:00 AM PDT
- In force
- 7 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 10:20 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, 10.3 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1029 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 20 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
347 WWUS76 KEKA 271015 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 315 AM PDT Mon Sep 27 2021 CAZ110-111-114-271815- /O.NEW.KEKA.FR.Y.0042.210928T0900Z-210928T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 315 AM PDT Mon Sep 27 2021 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 9 AM PDT TUESDAY... * WHAT...Temperatures as low as 36 will result in frost formation. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior and Northern Lake Counties. * WHEN...From 2 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. && $$
5 follow-up statements
131 WWUS76 KEKA 271801 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1101 AM PDT Mon Sep 27 2021 CAZ110-111-114-280215- /O.CON.KEKA.FR.Y.0042.210928T0900Z-210928T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 1101 AM PDT Mon Sep 27 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 9 AM TUESDAY... * WHAT...Temperatures as low as 36 will result in frost formation. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior and Northern Lake Counties. * WHEN...From 2 AM to 9 AM Tuesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. $$
869 WWUS76 KEKA 272243 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 343 PM PDT Mon Sep 27 2021 CAZ107-108-280645- /O.EXA.KEKA.FR.Y.0042.210928T0900Z-210928T1600Z/ Northern Trinity-Southern Trinity- 343 PM PDT Mon Sep 27 2021 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 9 AM PDT TUESDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Northern Trinity and Southern Trinity Counties. * WHEN...From 2 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. && $$ CAZ110-111-114-280645- /O.CON.KEKA.FR.Y.0042.210928T0900Z-210928T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 343 PM PDT Mon Sep 27 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT TUESDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior and Northern Lake Counties. * WHEN...From 2 AM to 9 AM PDT Tuesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
899 WWUS76 KEKA 280529 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1029 PM PDT Mon Sep 27 2021 CAZ107-108-110-111-114-281330- /O.CON.KEKA.FR.Y.0042.210928T0900Z-210928T1600Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Northern Lake- 1029 PM PDT Mon Sep 27 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT TUESDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Trinity and Northern Lake Counties. * WHEN...From 2 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. && $$
251 WWUS76 KEKA 281058 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 358 AM PDT Tue Sep 28 2021 CAZ107-108-110-111-114-281600- /O.CON.KEKA.FR.Y.0042.000000T0000Z-210928T1600Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Northern Lake- 358 AM PDT Tue Sep 28 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Trinity and Northern Lake Counties. * WHEN...Until 9 AM PDT this morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
405 WWUS76 KEKA 281552 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 852 AM PDT Tue Sep 28 2021 CAZ107-108-110-111-114-281700- /O.EXP.KEKA.FR.Y.0042.000000T0000Z-210928T1600Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Northern Lake- 852 AM PDT Tue Sep 28 2021 ...FROST ADVISORY WILL EXPIRE AT 9 AM THIS MORNING... More frost is expected to form tonight and Wednesday morning, and another advisory will likely be issued. $$
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.