Alert archive / California / Freeze Warnings in 2017
Freeze Warning 4, NWS Eureka, CA
NWS Eureka, CA issued this freeze warning at Apr 8, 2017, 2:50 PM PDT for Del Norte County, Humboldt County, Mendocino County, California. It took effect at Apr 9, 2017, 1:00 AM PDT. It was in force for 8 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Apr 8, 2017, 2:50 PM PDT (21:50 UTC)
- In effect from
- Apr 9, 2017, 1:00 AM PDT
- Expired
- Apr 9, 2017, 9:00 AM PDT
- In force
- 8 hr
- Issued by
- NWS Eureka, CA
Counties Del Norte County, CA, Humboldt County, CA, Mendocino County, CA
The nearest sounding before it
Medford/Jackson, OR (KMFR), launched 12:00Z, 9.8 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
- 27 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 731 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- -15 m²/s²
- 0-3 km storm-relative helicity
- 12 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
336 WWUS76 KEKA 082150 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 250 PM PDT Sat Apr 8 2017 CAZ102-105-106-110-111-113-091600- /O.NEW.KEKA.FZ.W.0004.170409T0800Z-170409T1600Z/ Del Norte Interior-Northern Humboldt Interior- Southern Humboldt Interior-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- 250 PM PDT Sat Apr 8 2017 ...FREEZE WARNING IN EFFECT FROM 1 AM TO 9 AM SUNDAY... The National Weather Service in Eureka has issued a Freeze Warning...which is in effect from 1 AM to 9 AM Sunday. * LOW TEMPERATURES...Upper 20S to lower 30S. * LOCATIONS INCLUDE...Willow Creek, Orleans, Laytonville, Willits, Covelo. * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map PRECAUTIONARY/PREPAREDNESS ACTIONS... A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation. $$ CAZ103-104-109-112-091600- /O.NEW.KEKA.FR.Y.0007.170409T0800Z-170409T1600Z/ Northern Humboldt Coast-Southwestern Humboldt-Mendocino Coast- Southwestern Mendocino Interior- 250 PM PDT Sat Apr 8 2017 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM SUNDAY... The National Weather Service in Eureka has issued a Frost Advisory...which is in effect from 1 AM to 9 AM Sunday. * LOCATIONS INCLUDE...Arcata, Fortuna, Petrolia, Honeydew, Ettersberg, Fort Bragg, Boonville, Comptche. * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map PRECAUTIONARY/PREPAREDNESS ACTIONS... A Frost Advisory means that frost is possible. Sensitive outdoor plants may be killed if left uncovered. $$
3 follow-up statements
317 WWUS76 KEKA 082353 AAA NPWEKA URGENT - WEATHER MESSAGE...UPDATED National Weather Service Eureka CA 453 PM PDT Sat Apr 8 2017 CAZ102-105-106-110-111-113-091300- /O.CON.KEKA.FZ.W.0004.170409T0800Z-170409T1600Z/ Del Norte Interior-Northern Humboldt Interior- Southern Humboldt Interior-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- 453 PM PDT Sat Apr 8 2017 ...FREEZE WARNING REMAINS IN EFFECT FROM 1 AM TO 9 AM PDT SUNDAY... * LOW TEMPERATURES...Upper 20S to lower 30S. * LOCATIONS INCLUDE...Willow Creek, Orleans, Laytonville, Willits, Covelo. * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map $$ CAZ103-104-109-112-091300- /O.CON.KEKA.FR.Y.0007.170409T0800Z-170409T1600Z/ Northern Humboldt Coast-Southwestern Humboldt-Mendocino Coast- Southwestern Mendocino Interior- 453 PM PDT Sat Apr 8 2017 ...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM PDT SUNDAY... * LOCATIONS INCLUDE...Boonville...Comptche...Fortuna ...Patrolia...Honeydew...Ettersberg. * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map $$
557 WWUS76 KEKA 090947 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 247 AM PDT Sun Apr 9 2017 CAZ102-105-106-110-111-113-091600- /O.CON.KEKA.FZ.W.0004.000000T0000Z-170409T1600Z/ Del Norte Interior-Northern Humboldt Interior- Southern Humboldt Interior-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- 247 AM PDT Sun Apr 9 2017 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * LOW TEMPERATURES...Upper 20S to lower 30S. * LOCATIONS INCLUDE...Gasquet...Ukiah...Hopland...Covelo... .. ....Willow Creek...Orleans...Garberville...Bridgeville... Leggett... Laytonville...Willits. * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map $$ CAZ103-104-109-112-091600- /O.CON.KEKA.FR.Y.0007.000000T0000Z-170409T1600Z/ Northern Humboldt Coast-Southwestern Humboldt-Mendocino Coast- Southwestern Mendocino Interior- 247 AM PDT Sun Apr 9 2017 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * LOCATIONS INCLUDE...Fort Bragg...Point Arena...Boonville... Comptche...Arcata...Eureka...Fortuna...Patrolia...Honeydew... Ettersberg. * FOR A DETAILED VIEW OF THE HAZARD AREA...visit http://www.wrh.noaa.gov/map $$
506 WWUS76 KEKA 091600 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 900 AM PDT Sun Apr 9 2017 CAZ102-105-106-110-111-113-091700- /O.EXP.KEKA.FZ.W.0004.000000T0000Z-170409T1600Z/ Del Norte Interior-Northern Humboldt Interior- Southern Humboldt Interior-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- 900 AM PDT Sun Apr 9 2017 ...FREEZE WARNING HAS EXPIRED... $$ CAZ103-104-109-112-091700- /O.EXP.KEKA.FR.Y.0007.000000T0000Z-170409T1600Z/ Northern Humboldt Coast-Southwestern Humboldt-Mendocino Coast- Southwestern Mendocino Interior- 900 AM PDT Sun Apr 9 2017 ...FROST ADVISORY HAS EXPIRED... $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 7, 6:35 PM PDT | Small Craft Advisory | EKA | 20 hr | |
| Apr 8, 8:52 AM PDT | Special Weather Statement | EKA | Mendocino | 53 min |
| Apr 8, 2:50 PM PDT | Frost Advisory | EKA | Humboldt, Mendocino | 18 hr |
| Apr 8, 3:12 PM PDT | Gale Warning | EKA | 30 hr | |
| Apr 8, 3:12 PM PDT | Small Craft Advisory | EKA | 66 hr | |
| Apr 8, 3:12 PM PDT | Small Craft Advisory | EKA | 64 hr |
Nearby
Freeze Warnings in California, 2017Every freeze warning 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.