Alert archive / California / Freeze Warnings in 2021
Freeze Warning 1, NWS Eureka, CA
NWS Eureka, CA issued this freeze warning at Feb 28, 2021, 3:10 PM PST for Lake County, Mendocino County, California. It took effect at Mar 1, 2021, 12:00 AM PST. 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
- Feb 28, 2021, 3:10 PM PST (23:10 UTC)
- In effect from
- Mar 1, 2021, 12:00 AM PST
- Expired
- Mar 1, 2021, 8:00 AM PST
- In force
- 8 hr
- Issued by
- NWS Eureka, CA
Counties Lake County, CA, Mendocino County, CA
The radar
The Beale AFB radar (KBBX), 128 km from the middle of the area, began a volume at 23:11 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, 11.2 hours before the alert went out and 188 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
- 2545 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 59 m²/s²
- 0-3 km storm-relative helicity
- 38 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
752 WWUS76 KEKA 282310 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 310 PM PST Sun Feb 28 2021 CAZ111-114-010700- /O.NEW.KEKA.FZ.W.0001.210301T0800Z-210301T1600Z/ Northeastern Mendocino Interior-Northern Lake County- 310 PM PST Sun Feb 28 2021 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM PST MONDAY... * WHAT...Sub-freezing temperatures as low as 30 expected. * WHERE...Northeastern Mendocino Interior and Northern Lake County, including Covelo and Lake Pillsbury. * WHEN...From midnight tonight to 8 AM PST 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.. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ110-113-115-010700- /O.NEW.KEKA.FR.Y.0001.210301T0800Z-210301T1600Z/ Northwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake County- 310 PM PST Sun Feb 28 2021 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM PST MONDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Northwestern Mendocino Interior, Southeastern Mendocino Interior and Southern Lake County, including Ukiah, Willits, Laytonville, Lakeport, Clearlake, and Middletown. * WHEN...From midnight tonight to 8 AM PST Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
2 follow-up statements
684 WWUS76 KEKA 010645 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1045 PM PST Sun Feb 28 2021 CAZ111-114-011600- /O.CON.KEKA.FZ.W.0001.210301T0800Z-210301T1600Z/ Northeastern Mendocino Interior-Northern Lake County- 1045 PM PST Sun Feb 28 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM PST MONDAY... * WHAT...Sub-freezing temperatures as low as 30 expected. * WHERE...Northeastern Mendocino Interior and Northern Lake County, including Covelo and Lake Pillsbury. * WHEN...From midnight tonight to 8 AM PST 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.. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ110-113-115-011600- /O.CON.KEKA.FR.Y.0001.210301T0800Z-210301T1600Z/ Northwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake County- 1045 PM PST Sun Feb 28 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST MONDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Northwestern Mendocino Interior, Southeastern Mendocino Interior and Southern Lake County, including Ukiah, Willits, Laytonville, Lakeport, Clearlake, and Middletown. * WHEN...From midnight tonight to 8 AM PST Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
970 WWUS76 KEKA 011017 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 217 AM PST Mon Mar 1 2021 CAZ111-114-011600- /O.CON.KEKA.FZ.W.0001.000000T0000Z-210301T1600Z/ Northeastern Mendocino Interior-Northern Lake County- 217 AM PST Mon Mar 1 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM PST THIS MORNING... * WHAT...Sub-freezing temperatures as low as 30. * WHERE...Northeastern Mendocino Interior and Northern Lake County, including Covelo and Lake Pillsbury. * WHEN...Until 8 AM PST this morning. * 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. && $$ CAZ110-113-115-011600- /O.CON.KEKA.FR.Y.0001.000000T0000Z-210301T1600Z/ Northwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake County- 217 AM PST Mon Mar 1 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST THIS MORNING... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Southeastern Mendocino Interior, Northwestern Mendocino Interior and Southern Lake County...including Ukiah, Willits, Laytonville, Lakeport, Clearlake, and Middletown. * WHEN...Until 8 AM PST this morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 28, 3:10 PM PST | Frost Advisory | EKA | Mendocino | 17 hr |
Nearby
Freeze Warnings in California, 2021Every freeze warning in 2021
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.