Alert archive / California / Frost Advisories in 2021
Frost Advisory 47, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Oct 14, 2021, 2:05 PM PDT for 4 counties in California. It took effect at Oct 15, 2021, 1:00 AM PDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Oct 14, 2021, 2:05 PM PDT (21:05 UTC)
- In effect from
- Oct 15, 2021, 1:00 AM PDT
- Expired
- Oct 15, 2021, 9:00 AM PDT
- In force
- 8 hr
- Issued by
- NWS Eureka, CA
Counties Humboldt County, CA, Lake County, CA, Mendocino County, CA, Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 102 km from the middle of the area, began a volume at 21:04 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, 9.1 hours before the alert went out and 267 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
- 1599 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- -32 m²/s²
- 0-3 km storm-relative helicity
- 151 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
659 WWUS76 KEKA 142105 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 205 PM PDT Thu Oct 14 2021 CAZ106-108-110-111-114-150515- /O.NEW.KEKA.FR.Y.0047.211015T0800Z-211015T1600Z/ Southern Humboldt Interior-Southern Trinity- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 205 PM PDT Thu Oct 14 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM PDT FRIDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Southern Humboldt Interior, Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior and Northern Lake Counties. * WHEN...From 1 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. && $$
2 follow-up statements
915 WWUS76 KEKA 150546 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1046 PM PDT Thu Oct 14 2021 CAZ106-108-110-111-114-151600- /O.CON.KEKA.FR.Y.0047.211015T0800Z-211015T1600Z/ Southern Humboldt Interior-Southern Trinity- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 1046 PM PDT Thu Oct 14 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT FRIDAY... * WHAT...Temperatures in the low to mid 30s will result in frost formation. * WHERE...Sheltered valleys across Southern Trinity County, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Lake and Southern Humboldt Interior. * WHEN...Until 9 AM PDT Friday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
349 WWUS76 KEKA 151534 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 834 AM PDT Fri Oct 15 2021 CAZ106-108-110-111-114-151645- /O.EXP.KEKA.FR.Y.0047.000000T0000Z-211015T1600Z/ Southern Humboldt Interior-Southern Trinity- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 834 AM PDT Fri Oct 15 2021 ...FROST ADVISORY WILL EXPIRE AT 9 AM PDT THIS MORNING... $$
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.