Alert archive / California / Frost Advisories in 2017
Frost Advisory 16, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Sep 22, 2017, 3:08 PM PDT for Mendocino County, Trinity County, California. It took effect at Sep 23, 2017, 1:00 AM PDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Sep 22, 2017, 3:08 PM PDT (22:08 UTC)
- In effect from
- Sep 23, 2017, 1:00 AM PDT
- Expired
- Sep 23, 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 22:10 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, 10.1 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
- 731 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 6 m²/s²
- 0-3 km storm-relative helicity
- 34 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
740 WWUS76 KEKA 222208 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 308 PM PDT Fri Sep 22 2017 CAZ107-108-110-111-231115- /O.NEW.KEKA.FR.Y.0016.170923T0800Z-170923T1500Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior- 308 PM PDT Fri Sep 22 2017 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 8 AM PDT SATURDAY... The National Weather Service in Eureka has issued a Frost Advisory...which is in effect from 1 AM to 8 AM PDT Saturday. * TEMPERATURES...33 to 36 degrees. * LOCATIONS INCLUDE...Weaverville...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. && $$
1 follow-up statement
420 WWUS76 KEKA 230901 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 201 AM PDT Sat Sep 23 2017 CAZ107-108-110-111-231500- /O.CON.KEKA.FR.Y.0016.000000T0000Z-170923T1500Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior- 201 AM PDT Sat Sep 23 2017 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PDT THIS MORNING... * TEMPERATURES...33 to 36 degrees. * LOCATIONS INCLUDE...Weaverville...Trinity Center...Hayfork...Ruth...Leggett...Laytonville...Willits... Covelo. * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map PRECAUTIONARY/PREPAREDNESS ACTIONS... A Frost Advisory means that frost is possible. Sensitive outdoor plants may be killed if left uncovered. $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 22, 2:56 AM PDT | Small Craft Advisory | EKA | 5 days |
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.