Alert archive / California / Frost Advisories in 2018
Frost Advisory 41, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Dec 25, 2018, 2:52 AM PST for Humboldt County, Mendocino County, California. It took effect at Dec 26, 2018, 1:00 AM PST. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Dec 25, 2018, 2:52 AM PST (10:52 UTC)
- In effect from
- Dec 26, 2018, 1:00 AM PST
- Expired
- Dec 26, 2018, 9:00 AM PST
- In force
- 8 hr
- Issued by
- NWS Eureka, CA
Counties Humboldt County, CA, Mendocino County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 71 km from the middle of the area, began a volume at 10:50 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, 10.9 hours before the alert went out and 266 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
- 599 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 20 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
220 WWUS76 KEKA 251052 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 252 AM PST Tue Dec 25 2018 CAZ103-260000- /O.NEW.KEKA.FR.Y.0041.181226T0900Z-181226T1700Z/ Northern Humboldt Coast- 252 AM PST Tue Dec 25 2018 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM PST WEDNESDAY... The National Weather Service in Eureka has issued a Frost Advisory...which is in effect from 1 AM to 9 AM PST Wednesday. * LOW TEMPERATURES...mid 30s. * LOCATIONS INCLUDE...Arcata, Eureka, Fortuna and Blue Lake. * 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. && $$
2 follow-up statements
639 WWUS76 KEKA 252222 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 222 PM PST Tue Dec 25 2018 CAZ109-112-261130- /O.EXA.KEKA.FR.Y.0041.181226T0900Z-181226T1700Z/ Mendocino Coast-Southwestern Mendocino Interior- 222 PM PST Tue Dec 25 2018 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM PST WEDNESDAY... The National Weather Service in Eureka has issued a Frost Advisory...which is in effect from 1 AM to 9 AM PST Wednesday. * LOW TEMPERATURES...mid 30s. * LOCATIONS INCLUDE...Fort Bragg...Point Arena...Boonville... Comptche. * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map $$ CAZ103-261130- /O.CON.KEKA.FR.Y.0041.181226T0900Z-181226T1700Z/ Northern Humboldt Coast- 222 PM PST Tue Dec 25 2018 ...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM PST WEDNESDAY... * LOW TEMPERATURES...mid 30s. * LOCATIONS INCLUDE...Arcata...Eureka...Fortuna. * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map $$
170 WWUS76 KEKA 261123 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 323 AM PST Wed Dec 26 2018 CAZ103-109-112-261700- /O.CON.KEKA.FR.Y.0041.000000T0000Z-181226T1700Z/ Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior- 323 AM PST Wed Dec 26 2018 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING... * LOW TEMPERATURES...mid 30s. * LOCATIONS INCLUDE...Fort Bragg...Point Arena...Boonville... Comptche...Arcata...Eureka...Fortuna. * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 25, 3:54 AM PST | Small Craft Advisory | EKA | 17 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.