Alert archive / California / Frost Advisories in 2020
Frost Advisory 13, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Mar 22, 2020, 2:21 PM PDT for Lake County, Mendocino County, California. It took effect at Mar 23, 2020, 1:00 AM PDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Mar 22, 2020, 2:21 PM PDT (21:21 UTC)
- In effect from
- Mar 23, 2020, 1:00 AM PDT
- Expired
- Mar 23, 2020, 9:00 AM PDT
- In force
- 8 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 21:23 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, 9.4 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
- 1066 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 41 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
172 WWUS76 KEKA 222121 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 221 PM PDT Sun Mar 22 2020 CAZ110-111-114-230530- /O.NEW.KEKA.FR.Y.0013.200323T0800Z-200323T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County- 221 PM PDT Sun Mar 22 2020 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM PDT MONDAY... * WHAT...Temperatures in the mid 30s will result in frost formation. * WHERE...Northern Mendocino interior and Northern Lake County including Laytonville, Willits, Covelo, and Potter Valley * WHEN...From 1 AM to 9 AM PDT Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
3 follow-up statements
082 WWUS76 KEKA 230529 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1029 PM PDT Sun Mar 22 2020 CAZ110-111-114-231330- /O.CON.KEKA.FR.Y.0013.200323T0800Z-200323T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County- 1029 PM PDT Sun Mar 22 2020 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT MONDAY... * WHAT...Temperatures in the mid 30s will result in frost formation. * WHERE...Northern Mendocino interior and Northern Lake County including Laytonville, Willits, Covelo, and Potter Valley. * WHEN...From 1 AM to 9 AM PDT Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
531 WWUS76 KEKA 231327 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 627 AM PDT Mon Mar 23 2020 CAZ110-111-114-231600- /O.CON.KEKA.FR.Y.0013.000000T0000Z-200323T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County- 627 AM PDT Mon Mar 23 2020 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM THIS MORNING... * WHAT...Temperatures in the mid 30s will result in frost formation. * WHERE...Northern Mendocino interior and Northern Lake County including Laytonville, Willits, Covelo, and Potter Valley. * WHEN...Until 9 AM 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. $$
775 WWUS76 KEKA 231546 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 846 AM PDT Mon Mar 23 2020 CAZ110-111-114-231700- /O.EXP.KEKA.FR.Y.0013.000000T0000Z-200323T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County- 846 AM PDT Mon Mar 23 2020 ...FROST ADVISORY WILL EXPIRE AT 9 AM PDT THIS MORNING... $$
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; radar from the NEXRAD Level II archive.