Alert archive / California / Freeze Warnings in 2020
Freeze Warning 2, NWS Eureka, CA
NWS Eureka, CA issued this freeze warning at Mar 1, 2020, 2:42 PM PST for Mendocino County, California. It took effect at Mar 2, 2020, 12:00 AM PST. It was in force for 4 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
- Mar 1, 2020, 2:42 PM PST (22:42 UTC)
- In effect from
- Mar 2, 2020, 12:00 AM PST
- Expired
- Mar 2, 2020, 3:50 AM PST
- In force
- 4 hr
- Issued by
- NWS Eureka, CA
County Mendocino County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 139 km from the middle of the area, began a volume at 22:47 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
Oakland, CA (KOAK), launched 12:00Z, 10.7 hours before the alert went out and 218 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
- 1096 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 127 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
434 WWUS76 KEKA 012242 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 242 PM PST Sun Mar 1 2020 CAZ110-111-020645- /O.NEW.KEKA.FZ.W.0002.200302T0800Z-200302T1700Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- 242 PM PST Sun Mar 1 2020 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM MONDAY... * WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Northwestern Mendocino Interior and Northeastern Mendocino Interior including Leggett, Laytonville, Willits, Potter Valley, and Covelo. * WHEN...From midnight tonight to 9 AM Monday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...Low temperatures will be several degrees warmer Monday night and Tuesday morning. However, frost will still be possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. $$ CAZ101-103-020645- /O.NEW.KEKA.FR.Y.0002.200302T0800Z-200302T1700Z/ Coastal Del Norte-Northern Humboldt Coast- 242 PM PST Sun Mar 1 2020 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM MONDAY... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Coastal Del Norte and Northern Humboldt Coast counties including Fieldbrook, Blue Lake, Freshwater, Hydesville, and Carlotta. * WHEN...From midnight tonight to 9 AM PST Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. * ADDITIONAL DETAILS...Low temperatures are expected to be several degrees warmer Monday night and Tuesday morning. As a result, only patchy frost is expected in the coldest locations. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. $$
2 follow-up statements
072 WWUS76 KEKA 020457 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 857 PM PST Sun Mar 1 2020 CAZ110-111-021300- /O.CON.KEKA.FZ.W.0002.200302T0800Z-200302T1700Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- 857 PM PST Sun Mar 1 2020 ...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PST MONDAY... * WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Northwestern Mendocino Interior and Northeastern Mendocino Interior including Leggett, Laytonville, Willits, Potter Valley, and Covelo. * WHEN...From midnight tonight to 9 AM Monday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ CAZ112-113-021300- /O.EXA.KEKA.FR.Y.0002.200302T0800Z-200302T1700Z/ Southwestern Mendocino Interior-Southeastern Mendocino Interior- 857 PM PST Sun Mar 1 2020 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PST MONDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Southwestern Mendocino Interior and Southeastern Mendocino Interior Counties including Ukiah, Hopland, Navarro, and Boonville. * WHEN...From midnight tonight to 9 AM PST Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ CAZ101-103-021300- /O.CON.KEKA.FR.Y.0002.200302T0800Z-200302T1700Z/ Coastal Del Norte-Northern Humboldt Coast- 857 PM PST Sun Mar 1 2020 ...FROST ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PST MONDAY... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Coastal Del Norte and Northern Humboldt Coast counties including Fieldbrook, Blue Lake, Freshwater, Hydesville, and Carlotta. * WHEN...From midnight tonight to 9 AM PST Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
738 WWUS76 KEKA 021150 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 350 AM PST Mon Mar 2 2020 CAZ110-111-021700- /O.CAN.KEKA.FZ.W.0002.000000T0000Z-200302T1700Z/ /O.EXA.KEKA.FR.Y.0002.000000T0000Z-200302T1700Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- 350 AM PST Mon Mar 2 2020 ...FROST ADVISORY IN EFFECT UNTIL 9 AM PST THIS MORNING... ...FREEZE WARNING IS CANCELLED... * WHAT...Temperatures as low as 33 will result in frost formation. A few of the most wind protected valleys may drop slightly below freezing as well. * WHERE...Northwestern Mendocino Interior and Northeastern Mendocino Interior Counties. * WHEN...Until 9 AM PST this morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ CAZ101-103-112-113-021700- /O.CON.KEKA.FR.Y.0002.000000T0000Z-200302T1700Z/ Coastal Del Norte-Northern Humboldt Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- 350 AM PST Mon Mar 2 2020 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Coastal Del Norte and Northern Humboldt Coast counties including Fieldbrook, Blue Lake, Freshwater, Hydesville, and Carlotta. * WHEN...From midnight tonight to 9 AM PST Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 1, 2:42 PM PST | Frost Advisory | EKA | Del Norte, Humboldt, Mendocino | 18 hr |
Nearby
Freeze Warnings in California, 2020Every freeze warning in 2020
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.