Alert archive / California / Frost Advisories in 2017
Frost Advisory 15, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Sep 21, 2017, 12:19 PM PDT for Mendocino County, Trinity County, California. It took effect at Sep 22, 2017, 1:00 AM PDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Sep 21, 2017, 12:19 PM PDT (19:19 UTC)
- In effect from
- Sep 22, 2017, 1:00 AM PDT
- Expired
- Sep 22, 2017, 8:00 AM PDT
- In force
- 7 hr
- Issued by
- NWS Eureka, CA
Counties Mendocino County, CA, Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 100 km from the middle of the area, began a volume at 19:38 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, 7.3 hours before the alert went out and 262 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
- 17 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 677 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 39 m²/s²
- 0-3 km storm-relative helicity
- 69 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
960 WWUS76 KEKA 211919 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1219 PM PDT Thu Sep 21 2017 CAZ107-108-110-111-220830- /O.NEW.KEKA.FR.Y.0015.170922T0800Z-170922T1500Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior- 1219 PM PDT Thu Sep 21 2017 ...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. * TEMPERATURES...33 to 36 degrees. Isolated pockets near or slightly below 32 degrees possible. * LOCATIONS INCLUDE...Weaverville...Douglas City...Trinity Center...Hayfork...Ruth...Leggett...Laytonville...Willits... 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. && $$
1 follow-up statement
707 WWUS76 KEKA 220733 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1233 AM PDT Fri Sep 22 2017 CAZ107-108-110-111-221500- /O.CON.KEKA.FR.Y.0015.170922T0800Z-170922T1500Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior- 1233 AM PDT Fri Sep 22 2017 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PDT THIS MORNING... * TEMPERATURES...33 to 36 degrees. Isolated pockets near or slightly below 32 degrees possible. * LOCATIONS INCLUDE...Weaverville...Douglas City...Trinity Center...Hayfork...Ruth...Leggett...Laytonville...Willits... Covelo.... * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map PRECAUTIONARY/PREPAREDNESS ACTIONS... A Frost Advisory means that frost is possible. Sensitive outdoor plants may be killed if left uncovered. $$
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.