Alert archive / California / Frost Advisories in 2017
Frost Advisory 21, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Oct 5, 2017, 6:43 PM PDT for Mendocino County, Trinity County, California. It took effect at Oct 6, 2017, 2:00 AM PDT. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- Oct 5, 2017, 6:43 PM PDT (01:43 UTC)
- In effect from
- Oct 6, 2017, 2:00 AM PDT
- Expired
- Oct 6, 2017, 7:37 AM PDT
- In force
- 6 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 01:45 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, 1.7 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3299 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 41 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
486 WWUS76 KEKA 060143 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 643 PM PDT Thu Oct 5 2017 CAZ107-108-110-111-061445- /O.NEW.KEKA.FR.Y.0021.171006T0900Z-171006T1600Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior- 643 PM PDT Thu Oct 5 2017 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 9 AM PDT FRIDAY... The National Weather Service in Eureka has issued a Frost Advisory...which is in effect from 2 AM to 9 AM PDT Friday. * LOW TEMPERATURES...low to mid 30's. * LOCATIONS INCLUDE...Weaverville...Burnt Ranch...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. && $$
1 follow-up statement
622 WWUS76 KEKA 061437 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 737 AM PDT Fri Oct 6 2017 CAZ107-108-110-111-061545- /O.CAN.KEKA.FR.Y.0021.000000T0000Z-171006T1600Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior- 737 AM PDT Fri Oct 6 2017 ...FROST ADVISORY IS CANCELLED... The National Weather Service in Eureka has cancelled the Frost Advisory. $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 5, 9:43 PM PDT | Gale Watch | EKA | 41 hr | |
| Oct 5, 9:43 PM PDT | Small Craft Advisory | EKA | 53 hr |
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.