Alert archive / California / Frost Advisories in 2018
Frost Advisory 9, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Apr 12, 2018, 3:21 PM PDT for Humboldt County, Mendocino County, California. It took effect at Apr 13, 2018, 1:00 AM PDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Apr 12, 2018, 3:21 PM PDT (22:21 UTC)
- In effect from
- Apr 13, 2018, 1:00 AM PDT
- Expired
- Apr 13, 2018, 8:00 AM PDT
- In force
- 7 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 22:24 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, 10.4 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
- 2 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 840 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 179 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
156 WWUS76 KEKA 122221 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 321 PM PDT Thu Apr 12 2018 CAZ106-110-111-113-131130- /O.NEW.KEKA.FR.Y.0009.180413T0800Z-180413T1500Z/ Southern Humboldt Interior-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- 321 PM PDT Thu Apr 12 2018 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 8 AM PDT FRIDAY... The National Weather Service in Eureka has issued a Frost Advisory...which is in effect from 1 AM to 8 AM PDT Friday. * LOW TEMPERATURES...mid 30s. * LOCATIONS INCLUDE...Garberville...Bridgeville...Leggett... Laytonville...Willits...Covelo...Hopland.... * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map PRECAUTIONARY/PREPAREDNESS ACTIONS... A Frost Advisory means that frost is possible. Sensitive outdoor plants may be killed if left uncovered. && $$
2 follow-up statements
075 WWUS76 KEKA 130504 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1004 PM PDT Thu Apr 12 2018 CAZ112-131500- /O.EXA.KEKA.FR.Y.0009.180413T0800Z-180413T1500Z/ Southwestern Mendocino Interior- 1004 PM PDT Thu Apr 12 2018 ...FROST ADVISORY IN EFFECT UNTIL 8 AM PDT FRIDAY... The National Weather Service in Eureka has issued a Frost Advisory...which is in effect until 8 AM PDT Friday. * LOW TEMPERATURES...mid 30s. * LOCATIONS INCLUDE...Boonville...Comptche... * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map $$ CAZ106-110-111-113-131500- /O.CON.KEKA.FR.Y.0009.180413T0800Z-180413T1500Z/ Southern Humboldt Interior-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- 1004 PM PDT Thu Apr 12 2018 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PDT FRIDAY... * LOW TEMPERATURES...mid 30s. * LOCATIONS INCLUDE...Garberville...Bridgeville...Leggett... Laytonville...Willits...Covelo...Hopland.... * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map $$
961 WWUS76 KEKA 130957 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 257 AM PDT Fri Apr 13 2018 CAZ106-110>113-131500- /O.CON.KEKA.FR.Y.0009.000000T0000Z-180413T1500Z/ Southern Humboldt Interior-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southwestern Mendocino Interior- Southeastern Mendocino Interior- 257 AM PDT Fri Apr 13 2018 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PDT THIS MORNING... * LOW TEMPERATURES...mid 30s. * LOCATIONS INCLUDE...Boonville...Comptche...Leggett...Laytonville...Willits... and Covelo. * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 11, 6:11 PM PDT | Winter Weather Advisory | EKA | Del Norte, Humboldt | 18 hr |
Nearby
Frost Advisories in California, 2018Every frost advisory in 2018
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.