Alert archive / California / Frost Advisories in 2017
Frost Advisory 19, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Oct 4, 2017, 12:24 AM PDT for Trinity County, California. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Oct 4, 2017, 12:24 AM PDT (07:24 UTC)
- Expired
- Oct 4, 2017, 9:00 AM PDT
- In force
- 9 hr
- Issued by
- NWS Eureka, CA
County Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 101 km from the middle of the area, began a volume at 07:29 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, 7.4 hours before the alert went out and 193 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
- 3114 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- -1 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
633 WWUS76 KEKA 040724 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1224 AM PDT Wed Oct 4 2017 CAZ108-041600- /O.NEW.KEKA.FR.Y.0019.171004T0724Z-171004T1600Z/ Southern Trinity- 1224 AM PDT Wed Oct 4 2017 ...FROST ADVISORY IN EFFECT UNTIL 9 AM PDT THIS MORNING... The National Weather Service in Eureka has issued a Frost Advisory...which is in effect until 9 AM PDT this morning. * TEMPERATURES...32 to 36 degrees. * LOCATIONS INCLUDE...Hayfork...Ruth. * 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. && $$
1 follow-up statement
553 WWUS76 KEKA 041537 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 837 AM PDT Wed Oct 4 2017 CAZ108-041645- /O.EXP.KEKA.FR.Y.0019.000000T0000Z-171004T1600Z/ Southern Trinity- 837 AM PDT Wed Oct 4 2017 ...FROST ADVISORY WILL EXPIRE AT 9 AM PDT THIS MORNING... Overnight low temperatures were in the upper 20s to mid 30s. Temperatures will rise this morning with daytime heating. This will be the final statement issued for this event. $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 4, 2:46 PM PDT | Frost Advisory | EKA | Humboldt, Mendocino | 18 hr |
| Oct 4, 2:46 PM PDT | Freeze Warning | EKA | Mendocino, Trinity | 18 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.