Alert archive / California / Frost Advisories in 2018
Frost Advisory 13, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Apr 30, 2018, 2:50 AM PDT for Del Norte County, Humboldt County, Trinity County, California. It took effect at May 1, 2018, 3:00 AM PDT. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- Apr 30, 2018, 2:50 AM PDT (09:50 UTC)
- In effect from
- May 1, 2018, 3:00 AM PDT
- Expired
- May 1, 2018, 9:00 AM PDT
- In force
- 6 hr
- Issued by
- NWS Eureka, CA
Counties Del Norte County, CA, Humboldt County, CA, Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 80 km from the middle of the area, began a volume at 09:50 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, 9.8 hours before the alert went out and 165 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
- 14 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 859 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- -27 m²/s²
- 0-3 km storm-relative helicity
- -20 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
573 WWUS76 KEKA 300950 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 250 AM PDT Mon Apr 30 2018 CAZ102-105-107-108-302300- /O.NEW.KEKA.FR.Y.0013.180501T1000Z-180501T1600Z/ Del Norte Interior-Northern Humboldt Interior-Northern Trinity- Southern Trinity- 250 AM PDT Mon Apr 30 2018 ...FROST ADVISORY IN EFFECT FROM 3 AM TO 9 AM PDT TUESDAY... The National Weather Service in Eureka has issued a Frost Advisory...which is in effect from 3 AM to 9 AM PDT Tuesday. * LOW TEMPERATURES...mid 30s. * LOCATIONS INCLUDE...Orleans...Willow Creek... Weaverville...Burnt Ranch...Trinity Center...Hayfork and Hyampom. * 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. && $$
2 follow-up statements
663 WWUS76 KEKA 302028 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 128 PM PDT Mon Apr 30 2018 CAZ102-105-107-108-011130- /O.CON.KEKA.FR.Y.0013.180501T1000Z-180501T1600Z/ Del Norte Interior-Northern Humboldt Interior-Northern Trinity- Southern Trinity- 128 PM PDT Mon Apr 30 2018 ...FROST ADVISORY REMAINS IN EFFECT FROM 3 AM TO 9 AM PDT TUESDAY... * LOW TEMPERATURES...mid 30s. * LOCATIONS INCLUDE...Hayfork...Ruth...Gasquet...Orleans... Willow Creek ...Weaverville...Burnt Ranch...Trinity Center * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map $$
054 WWUS76 KEKA 010958 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 258 AM PDT Tue May 1 2018 CAZ106-011600- /O.EXA.KEKA.FR.Y.0013.180501T1000Z-180501T1600Z/ Southern Humboldt Interior- 258 AM PDT Tue May 1 2018 ...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. * LOW TEMPERATURES...Mid 30s. * LOCATIONS INCLUDE...Garberville...Bridgeville. * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map $$ CAZ102-105-107-108-011600- /O.CON.KEKA.FR.Y.0013.180501T1000Z-180501T1600Z/ Del Norte Interior-Northern Humboldt Interior-Northern Trinity- Southern Trinity- 258 AM PDT Tue May 1 2018 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * LOW TEMPERATURES...Mid 30s. * LOCATIONS INCLUDE...Hayfork...Ruth...Gasquet...Orleans... Willow Creek...Weaverville...Burnt Ranch...Trinity Center. * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 30, 3:07 AM PDT | Gale Warning | EKA | 48 hr | |
| Apr 30, 2:02 PM PDT | Small Craft Advisory | EKA | 7 hr |
Nearby
Frost Advisories in California, 2018Every frost advisory in 2018
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.