Alert archive / California / Frost Advisories in 2021
Frost Advisory 24, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Apr 8, 2021, 1:51 PM PDT for 4 counties in California. It took effect at Apr 9, 2021, 3:00 AM PDT. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- Apr 8, 2021, 1:51 PM PDT (20:51 UTC)
- In effect from
- Apr 9, 2021, 3:00 AM PDT
- Expired
- Apr 9, 2021, 9:00 AM PDT
- In force
- 6 hr
- Issued by
- NWS Eureka, CA
Counties Del Norte County, CA, Humboldt County, CA, Lake County, CA, Mendocino County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 72 km from the middle of the area, began a volume at 20:50 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 12:00Z, 8.9 hours before the alert went out and 244 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
- 944 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
246 WWUS76 KEKA 082051 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 151 PM PDT Thu Apr 8 2021 CAZ102-105-106-110-111-090530- /O.NEW.KEKA.FR.Y.0024.210409T1000Z-210409T1600Z/ Del Norte Interior-Northern Humboldt Interior- Southern Humboldt Interior-Northwestern Mendocino Interior- Northeastern Mendocino Interior- 151 PM PDT Thu Apr 8 2021 ...FROST ADVISORY IN EFFECT FROM 3 AM TO 9 AM PDT FRIDAY... * WHAT...Temperatures as low as 36 will result in frost formation. * WHERE...Del Norte Interior, Northern Humboldt Interior, Southern Humboldt Interior, Northwestern Mendocino Interior and Northeastern Mendocino Interior Counties. * WHEN...From 3 AM 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. && $$
3 follow-up statements
433 WWUS76 KEKA 090500 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1000 PM PDT Thu Apr 8 2021 CAZ102-105-106-110-111-091600- /O.CON.KEKA.FR.Y.0024.210409T1000Z-210409T1600Z/ Del Norte Interior-Northern Humboldt Interior- Southern Humboldt Interior-Northwestern Mendocino Interior- Northeastern Mendocino Interior- 1000 PM PDT Thu Apr 8 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 3 AM TO 9 AM PDT FRIDAY... * WHAT...Temperatures as low as 36 will result in frost formation. * WHERE...Del Norte Interior, Northern Humboldt Interior, Southern Humboldt Interior, Northwestern Mendocino Interior and Northeastern Mendocino Interior. * WHEN...From 3 AM to 9 AM PDT Friday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
195 WWUS76 KEKA 090957 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 257 AM PDT Fri Apr 9 2021 CAZ102-105-106-110-111-091600- /O.CON.KEKA.FR.Y.0024.210409T1000Z-210409T1600Z/ Del Norte Interior-Northern Humboldt Interior- Southern Humboldt Interior-Northwestern Mendocino Interior- Northeastern Mendocino Interior- 257 AM PDT Fri Apr 9 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Northwestern Mendocino Interior, Del Norte Interior, Northern Humboldt Interior, Northeastern Mendocino Interior and Southern Humboldt 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. && $$
543 WWUS76 KEKA 091014 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 314 AM PDT Fri Apr 9 2021 CAZ104-114-091600- /O.EXA.KEKA.FR.Y.0024.000000T0000Z-210409T1600Z/ Southwestern Humboldt-Northern Lake- 314 AM PDT Fri Apr 9 2021 ...FROST ADVISORY IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Temperatures as low as 35 will result in frost formation. * WHERE...Southwestern Humboldt and Northern Lake Counties. * WHEN...Until 9 AM PDT this morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ102-105-106-110-111-091600- /O.CON.KEKA.FR.Y.0024.000000T0000Z-210409T1600Z/ Del Norte Interior-Northern Humboldt Interior- Southern Humboldt Interior-Northwestern Mendocino Interior- Northeastern Mendocino Interior- 314 AM PDT Fri Apr 9 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Northeastern Mendocino Interior, Northwestern Mendocino Interior, Del Norte Interior, Northern Humboldt Interior and Southern Humboldt 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. && $$
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.