Alert archive / California / Frost Advisories in 2020
Frost Advisory 7, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Mar 9, 2020, 5:28 AM PDT for Lake County, Mendocino County, California. It took effect at Mar 10, 2020, 1:00 AM PDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Mar 9, 2020, 5:28 AM PDT (12:28 UTC)
- In effect from
- Mar 10, 2020, 1:00 AM PDT
- Expired
- Mar 10, 2020, 9:00 AM PDT
- In force
- 8 hr
- Issued by
- NWS Eureka, CA
Counties Lake County, CA, Mendocino County, CA
The nearest sounding before it
Oakland, CA (KOAK), launched 12:00Z, 0.5 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
- 1400 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 53 m²/s²
- 0-3 km storm-relative helicity
- 118 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
503 WWUS76 KEKA 091228 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 528 AM PDT Mon Mar 9 2020 CAZ110-111-114-115-092000- /O.NEW.KEKA.FR.Y.0007.200310T0800Z-200310T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County-Southern Lake County- 528 AM PDT Mon Mar 9 2020 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM PDT TUESDAY... * WHAT...Low temperatures reaching 32 to 36 degrees will result in frost formation. * WHERE...Many valley locations in Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Lake County and Southern Lake County Counties. Locations include Laytonville, Dos Rios, Covelo, Willits, Potter Valley, Upper Lake and Lakeport. * WHEN...From 1 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. && $$
3 follow-up statements
115 WWUS76 KEKA 092104 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 204 PM PDT Mon Mar 9 2020 CAZ110-111-114-115-100515- /O.CON.KEKA.FR.Y.0007.200310T0800Z-200310T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County-Southern Lake County- 204 PM PDT Mon Mar 9 2020 ...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM PDT TUESDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Lake County and Southern Lake County Counties. Locations include Laytonville, Dos Rios, Covelo, Willits, Potter Valley, Upper Lake and Lakeport. * WHEN...From 1 AM to 9 AM PDT Tuesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
444 WWUS76 KEKA 100502 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1002 PM PDT Mon Mar 9 2020 CAZ110-111-114-115-101600- /O.CON.KEKA.FR.Y.0007.200310T0800Z-200310T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County-Southern Lake County- 1002 PM PDT Mon Mar 9 2020 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT TUESDAY... * WHAT...Temperatures as low as 35 will result in frost formation. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Lake County and Southern Lake County Counties. * WHEN...Until 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. && $$
222 WWUS76 KEKA 101601 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 901 AM PDT Tue Mar 10 2020 CAZ110-111-114-115-101715- /O.EXP.KEKA.FR.Y.0007.000000T0000Z-200310T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County-Southern Lake County- 901 AM PDT Tue Mar 10 2020 ...FROST ADVISORY HAS EXPIRED... Any lingering frost will diminish rapidly during the late morning hours, but may linger slightly longer in some shaded locations. $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 9, 2:35 AM PDT | Small Craft Advisory | EKA | 3 days |
Nearby
Frost Advisories in California, 2020Every frost advisory in 2020
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.