Alert archive / California / Frost Advisories in 2017
Frost Advisory 14, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Sep 20, 2017, 3:12 AM PDT for Humboldt County, Mendocino County, Trinity County, California. It took effect at Sep 21, 2017, 3:00 AM PDT. It was in force for 5 hr.
The area
The counties it named.
The facts
- Issued
- Sep 20, 2017, 3:12 AM PDT (10:12 UTC)
- In effect from
- Sep 21, 2017, 3:00 AM PDT
- Expired
- Sep 21, 2017, 8:00 AM PDT
- In force
- 5 hr
- Issued by
- NWS Eureka, CA
Counties Humboldt County, CA, Mendocino County, CA, Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 73 km from the middle of the area, began a volume at 10:11 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 00:00Z, 10.2 hours before the alert went out and 241 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
- 16 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 1080 m above ground
- 0-6 km bulk shear
- 78 kt
- 0-1 km storm-relative helicity
- 201 m²/s²
- 0-3 km storm-relative helicity
- 257 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
440 WWUS76 KEKA 201012 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 312 AM PDT Wed Sep 20 2017 CAZ107-108-110-111-202315- /O.NEW.KEKA.FR.Y.0014.170921T1000Z-170921T1500Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior- 312 AM PDT Wed Sep 20 2017 ...FROST ADVISORY IN EFFECT FROM 3 AM TO 8 AM PDT THURSDAY... The National Weather Service in Eureka has issued a Frost Advisory...which is in effect from 3 AM to 8 AM PDT Thursday. * TEMPERATURES...33 TO 36F early Thurday morning. * LOCATIONS INCLUDE...Weaverville...Trinity Center... Hayfork...Ruth...Laytonville...Willits and Covelo. * 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. && $$
4 follow-up statements
299 WWUS76 KEKA 201859 CCA NPWEKA URGENT - WEATHER MESSAGE...CORRECTED National Weather Service Eureka CA 1159 AM PDT Wed Sep 20 2017 CAZ107-108-110-111-202315- /O.COR.KEKA.FR.Y.0014.170921T1000Z-170921T1500Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior- 1159 AM PDT Wed Sep 20 2017 ...FROST ADVISORY IN EFFECT FROM 3 AM TO 8 AM PDT THURSDAY... The National Weather Service in Eureka has issued a Frost Advisory...which is in effect from 3 AM to 8 AM PDT Thursday. * TEMPERATURES...33 TO 36F early Thursday morning. * LOCATIONS INCLUDE...Weaverville...Trinity Center... Hayfork...Ruth...Laytonville...Willits and Covelo. * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map PRECAUTIONARY/PREPAREDNESS ACTIONS... A Frost Advisory means that frost is possible. Sensitive outdoor plants may be killed if left uncovered. && $$
964 WWUS76 KEKA 202210 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 310 PM PDT Wed Sep 20 2017 CAZ105-211115- /O.EXA.KEKA.FR.Y.0014.170921T1000Z-170921T1500Z/ Northern Humboldt Interior- 310 PM PDT Wed Sep 20 2017 ...FROST ADVISORY IN EFFECT FROM 3 AM TO 8 AM PDT THURSDAY... The National Weather Service in Eureka has issued a Frost Advisory...which is in effect from 3 AM to 8 AM PDT Thursday. * TEMPERATURES...33 TO 36F early Thursday morning. * LOCATIONS INCLUDE...Orleans...Willow Creek...Hoopa. * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map $$ CAZ107-108-110-111-211115- /O.CON.KEKA.FR.Y.0014.170921T1000Z-170921T1500Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior- 310 PM PDT Wed Sep 20 2017 ...FROST ADVISORY REMAINS IN EFFECT FROM 3 AM TO 8 AM PDT THURSDAY... * TEMPERATURES...33 TO 36F early Thursday morning. Isolated locations may drop slightly below freezing for a brief period. * LOCATIONS INCLUDE...Weaverville...Trinity Center... Hayfork...Ruth...Laytonville...Willits and Covelo. * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map $$
965 WWUS76 KEKA 211103 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 403 AM PDT Thu Sep 21 2017 CAZ105-211215- /O.CAN.KEKA.FR.Y.0014.000000T0000Z-170921T1500Z/ Northern Humboldt Interior- 403 AM PDT Thu Sep 21 2017 ...FROST ADVISORY IS CANCELLED... The National Weather Service in Eureka has cancelled the Frost Advisory. Temperatures are too warm for frost. $$ CAZ107-108-110-111-211500- /O.CON.KEKA.FR.Y.0014.000000T0000Z-170921T1500Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior- 403 AM PDT Thu Sep 21 2017 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PDT THIS MORNING... * TEMPERATURES...mid 30s. * LOCATIONS INCLUDE...Hayfork...Ruth...Laytonville... Willits...Covelo...Weaverville and Trinity Center. * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map $$
179 WWUS76 KEKA 211446 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 746 AM PDT Thu Sep 21 2017 CAZ107-108-110-111-211600- /O.EXP.KEKA.FR.Y.0014.000000T0000Z-170921T1500Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior- 746 AM PDT Thu Sep 21 2017 ...FROST ADVISORY WILL EXPIRE AT 8 AM PDT THIS MORNING... Temperatures have warmed and the current Frost Advisory has been allowed to expire. However, additional pockets of frost will be possible overnight tonight and tomorrow morning. $$
Nearby
Frost Advisories in California, 2017Every frost advisory in 2017
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.