Alert archive / California / Frost Advisories in 2021
Frost Advisory 21, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Apr 2, 2021, 2:36 PM PDT for Humboldt County, Mendocino County, California. It took effect at Apr 3, 2021, 1:00 AM PDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Apr 2, 2021, 2:36 PM PDT (21:36 UTC)
- In effect from
- Apr 3, 2021, 1:00 AM PDT
- Expired
- Apr 3, 2021, 9:00 AM PDT
- In force
- 8 hr
- Issued by
- NWS Eureka, CA
Counties Humboldt County, CA, Mendocino County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 71 km from the middle of the area, began a volume at 21:36 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, 9.6 hours before the alert went out and 266 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
- 2112 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 181 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
796 WWUS76 KEKA 022136 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 236 PM PDT Fri Apr 2 2021 CAZ104-106-110-111-030500- /O.NEW.KEKA.FR.Y.0021.210403T0800Z-210403T1600Z/ Southwestern Humboldt-Southern Humboldt Interior- Northwestern Mendocino Interior-Northeastern Mendocino Interior- 236 PM PDT Fri Apr 2 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM PDT SATURDAY... * WHAT...Temperatures in the low to mid 30s will result in frost formation. * WHERE...Inland portions of Southwestern Humboldt, Southern Humboldt Interior, Northwestern Mendocino Interior and the Northeastern Mendocino County Interior. Locations include Willits, Potter Valley, Garberville, Covelo. * WHEN...From 1 AM to 9 AM PDT Saturday. * 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. && $$
3 follow-up statements
917 WWUS76 KEKA 030507 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1007 PM PDT Fri Apr 2 2021 CAZ104-106-110-111-031315- /O.CON.KEKA.FR.Y.0021.210403T0800Z-210403T1600Z/ Southwestern Humboldt-Southern Humboldt Interior- Northwestern Mendocino Interior-Northeastern Mendocino Interior- 1007 PM PDT Fri Apr 2 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT SATURDAY... * WHAT...Temperatures in the low to mid 30s will result in frost formation. * WHERE...Inland portions of Southwestern Humboldt, Southern Humboldt Interior, Northwestern Mendocino Interior and the Northeastern Mendocino County Interior. Locations include Willits, Potter Valley, Garberville, Covelo. * WHEN...From 1 AM to 9 AM PDT Saturday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
512 WWUS76 KEKA 031301 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 601 AM PDT Sat Apr 3 2021 CAZ104-106-110-111-031600- /O.CON.KEKA.FR.Y.0021.000000T0000Z-210403T1600Z/ Southwestern Humboldt-Southern Humboldt Interior- Northwestern Mendocino Interior-Northeastern Mendocino Interior- 601 AM PDT Sat Apr 3 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Temperatures in the low to mid 30s will result in frost formation. * WHERE...Inland portions of Southwestern Humboldt, Southern Humboldt Interior, Northwestern Mendocino Interior and the Northeastern Mendocino County Interior. Locations include Willits, Potter Valley, Garberville, Covelo. * WHEN...From 1 AM to 9 AM PDT Saturday. * 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. && $$
388 WWUS76 KEKA 031542 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 842 AM PDT Sat Apr 3 2021 CAZ104-106-110-111-031645- /O.EXP.KEKA.FR.Y.0021.000000T0000Z-210403T1600Z/ Southwestern Humboldt-Southern Humboldt Interior- Northwestern Mendocino Interior-Northeastern Mendocino Interior- 842 AM PDT Sat Apr 3 2021 ...FROST ADVISORY WILL EXPIRE AT 9 AM PDT THIS MORNING... $$
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.