Alert archive / California / Frost Advisories in 2019
Frost Advisory 21, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Oct 1, 2019, 8:30 PM PDT for Humboldt County, Mendocino County, Trinity County, California. It took effect at Oct 2, 2019, 3:00 AM PDT. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- Oct 1, 2019, 8:30 PM PDT (03:30 UTC)
- In effect from
- Oct 2, 2019, 3:00 AM PDT
- Expired
- Oct 2, 2019, 9:00 AM PDT
- In force
- 6 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 03:35 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, 3.5 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1980 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- -18 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
270 WWUS76 KEKA 020330 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 830 PM PDT Tue Oct 1 2019 CAZ106>108-110-111-021600- /O.NEW.KEKA.FR.Y.0021.191002T1000Z-191002T1600Z/ Southern Humboldt Interior-Northern Trinity-Southern Trinity- Northwestern Mendocino Interior-Northeastern Mendocino Interior- 830 PM PDT Tue Oct 1 2019 ...FROST ADVISORY IN EFFECT FROM 3 AM TO 9 AM PDT WEDNESDAY... The National Weather Service in Eureka has issued a Frost Advisory...which is in effect from 3 AM to 9 AM PDT Wednesday. * LOW TEMPERATURES...mid 30s. * LOCATIONS INCLUDE...Bridgeville, Dinsmore, Weaverville, Trinity Center, Hayfork, Douglas City, Ruth, Brooktrails, Willits, Dos Rios, Covelo and Potter Valley. * 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 expected. Sensitive outdoor plants may be killed if left uncovered. && $$
2 follow-up statements
632 WWUS76 KEKA 021051 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 351 AM PDT Wed Oct 2 2019 CAZ106>108-110-111-021600- /O.CON.KEKA.FR.Y.0021.000000T0000Z-191002T1600Z/ Southern Humboldt Interior-Northern Trinity-Southern Trinity- Northwestern Mendocino Interior-Northeastern Mendocino Interior- 351 AM PDT Wed Oct 2 2019 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * LOW TEMPERATURES...mid 30s. * LOCATIONS INCLUDE...Bridgeville, Dinsmore, Weaverville, Trinity Center, Hayfork, Douglas City, Ruth, Brooktrails, Willits, Dos Rios, Covelo and Potter Valley. * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map $$
630 WWUS76 KEKA 021553 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 853 AM PDT Wed Oct 2 2019 CAZ106>108-110-111-021700- /O.EXP.KEKA.FR.Y.0021.000000T0000Z-191002T1600Z/ Southern Humboldt Interior-Northern Trinity-Southern Trinity- Northwestern Mendocino Interior-Northeastern Mendocino Interior- 853 AM PDT Wed Oct 2 2019 ...FROST ADVISORY WILL EXPIRE AT 9 AM PDT THIS MORNING... $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 2, 8:07 AM PDT | Small Craft Advisory | EKA | 40 hr | |
| Oct 2, 2:08 PM PDT | Frost Advisory | EKA | Mendocino, Trinity | 13 hr |
Nearby
Frost Advisories in California, 2019Every frost advisory in 2019
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.