Alert archive / California / Frost Advisories in 2021
Frost Advisory 16, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Mar 24, 2021, 2:08 PM PDT for Lake County, Mendocino County, California. It took effect at Mar 25, 2021, 5:00 AM PDT. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- Mar 24, 2021, 2:08 PM PDT (21:08 UTC)
- In effect from
- Mar 25, 2021, 5:00 AM PDT
- Expired
- Mar 25, 2021, 9:00 AM PDT
- In force
- 4 hr
- Issued by
- NWS Eureka, CA
Counties Lake County, CA, Mendocino County, CA
The radar
The Beale AFB radar (KBBX), 128 km from the middle of the area, began a volume at 21:06 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 188 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
- 3089 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 88 m²/s²
- 0-3 km storm-relative helicity
- 82 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
348 WWUS76 KEKA 242108 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 208 PM PDT Wed Mar 24 2021 CAZ110-111-114-115-250515- /O.NEW.KEKA.FR.Y.0016.210325T1200Z-210325T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake-Southern Lake- 208 PM PDT Wed Mar 24 2021 ...FROST ADVISORY IN EFFECT FROM 5 AM TO 9 AM PDT THURSDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...From 5 AM to 9 AM PDT Thursday. * 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. && $$
2 follow-up statements
729 WWUS76 KEKA 250503 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1003 PM PDT Wed Mar 24 2021 CAZ110-111-114-115-251600- /O.CON.KEKA.FR.Y.0016.210325T1200Z-210325T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake-Southern Lake- 1003 PM PDT Wed Mar 24 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 5 AM TO 9 AM THURSDAY... * WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior, and Lake counties. * WHEN...From 5 AM to 9 AM Thursday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. $$
582 WWUS76 KEKA 251545 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 845 AM PDT Thu Mar 25 2021 CAZ110-111-114-115-251645- /O.EXP.KEKA.FR.Y.0016.000000T0000Z-210325T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake-Southern Lake- 845 AM PDT Thu Mar 25 2021 ...FROST ADVISORY WILL EXPIRE AT 9 AM PDT THIS MORNING... $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 24, 8:09 AM PDT | Gale Watch | EKA | 18 hr | |
| Mar 24, 2:13 PM PDT | Small Craft Advisory | EKA | 28 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.