Alert archive / California / Frost Advisories in 2018
Frost Advisory 40, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Dec 21, 2018, 7:44 PM PST for Del Norte County, Humboldt County, Mendocino County, California. It took effect at Dec 21, 2018, 10:00 PM PST. It was in force for 10 hr.
The area
The counties it named.
The facts
- Issued
- Dec 21, 2018, 7:44 PM PST (03:44 UTC)
- In effect from
- Dec 21, 2018, 10:00 PM PST
- Expired
- Dec 22, 2018, 8:00 AM PST
- In force
- 10 hr
- Issued by
- NWS Eureka, CA
Counties Del Norte County, CA, Humboldt County, CA, Mendocino County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 47 km from the middle of the area, began a volume at 03:44 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, 3.7 hours before the alert went out and 210 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
- 1135 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 31 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
261 WWUS76 KEKA 220344 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 744 PM PST Fri Dec 21 2018 CAZ101-103-109-112-221600- /O.NEW.KEKA.FR.Y.0040.181222T0600Z-181222T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior- 744 PM PST Fri Dec 21 2018 ...FROST ADVISORY IN EFFECT UNTIL 8 AM SATURDAY... * LOW TEMPERATURES...Mid 30s. * LOCATIONS INCLUDE...Crescent City, Arcata, Eureka, Fortuna, Fort Bragg, Boonville, and Comptche. * 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. $$
1 follow-up statement
240 WWUS76 KEKA 221157 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 357 AM PST Sat Dec 22 2018 CAZ101-103-109-112-221600- /O.CON.KEKA.FR.Y.0040.000000T0000Z-181222T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior- 357 AM PST Sat Dec 22 2018 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST THIS MORNING... * LOW TEMPERATURES...mid 30s. * LOCATIONS INCLUDE...Crescent City...Fort ...Bragg...Point Arena...Arcata...Eureka...Fortuna...Boonville...Comptche. * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 22, 4:03 AM PST | Coastal Flood Advisory | EKA | Del Norte, Humboldt | 33 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.