Alert archive / California / Freeze Warnings in 2021
Freeze Warning 3, NWS Eureka, CA
NWS Eureka, CA issued this freeze warning at Mar 4, 2021, 1:07 AM PST for Lake County, Mendocino County, California. It was in force for 7 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 4, 2021, 1:07 AM PST (09:07 UTC)
- Expired
- Mar 4, 2021, 8:00 AM PST
- In force
- 7 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 09:11 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 00:00Z, 9.1 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
- 1319 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -41 m²/s²
- 0-3 km storm-relative helicity
- -24 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
496 WWUS76 KEKA 040907 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 107 AM PST Thu Mar 4 2021 CAZ110-111-114-041600- /O.NEW.KEKA.FZ.W.0003.210304T0907Z-210304T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County- 107 AM PST Thu Mar 4 2021 ...FREEZE WARNING IN EFFECT UNTIL 8 AM PST THIS MORNING... * WHAT...Sub-freezing temperatures as low as 31. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior and Northern Lake County Counties. * 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.. 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. && $$ CAZ112-115-041600- /O.NEW.KEKA.FR.Y.0004.210304T0907Z-210304T1600Z/ Southwestern Mendocino Interior-Southern Lake County- 107 AM PST Thu Mar 4 2021 ...FROST ADVISORY IN EFFECT UNTIL 8 AM PST THIS MORNING... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Southwestern Mendocino Interior and Southern Lake County Counties. * WHEN...Until 8 AM PST this morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ101-041715- /O.CON.KEKA.WI.Y.0009.210304T1800Z-210305T1500Z/ Coastal Del Norte- 107 AM PST Thu Mar 4 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 7 AM PST FRIDAY... * WHAT...South winds 15 to 25 mph with gusts up to 45 mph expected. * WHERE...Coastal Del Norte County. * WHEN...From 10 AM Thursday to 7 AM PST Friday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ CAZ102-104>106-041715- /O.CON.KEKA.WI.Y.0009.210304T2300Z-210305T1500Z/ Del Norte Interior-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- 107 AM PST Thu Mar 4 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 3 PM THIS AFTERNOON TO 7 AM PST FRIDAY ABOVE 1500 FEET... * WHAT...South winds 20 to 30 mph with gusts up to 50 mph over exposed areas above 1500 feet. * WHERE...Del Norte Interior, Northern Humboldt Interior, Southwestern Humboldt and Southern Humboldt Interior Counties. * WHEN...From 3 PM Thursday to 7 AM PST Friday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$
1 follow-up statement
795 WWUS76 KEKA 041546 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 746 AM PST Thu Mar 4 2021 CAZ110-111-114-041700- /O.EXP.KEKA.FZ.W.0003.000000T0000Z-210304T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County- 746 AM PST Thu Mar 4 2021 ...FREEZE WARNING WILL EXPIRE AT 8 AM PST THIS MORNING... $$ CAZ112-115-041700- /O.EXP.KEKA.FR.Y.0004.000000T0000Z-210304T1600Z/ Southwestern Mendocino Interior-Southern Lake County- 746 AM PST Thu Mar 4 2021 ...FROST ADVISORY WILL EXPIRE AT 8 AM PST THIS MORNING... $$ CAZ101-050000- /O.CON.KEKA.WI.Y.0009.210304T1800Z-210305T1500Z/ Coastal Del Norte- 746 AM PST Thu Mar 4 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 7 AM PST FRIDAY... * WHAT...South winds 15 to 25 mph with gusts up to 45 mph expected. * WHERE...Coastal Del Norte County. * WHEN...Until 7 AM PST Friday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ CAZ102-104>106-050000- /O.CON.KEKA.WI.Y.0009.210304T2300Z-210305T1500Z/ Del Norte Interior-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- 746 AM PST Thu Mar 4 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 3 PM THIS AFTERNOON TO 7 AM PST FRIDAY ABOVE 1500 FEET... * WHAT...South winds 15 to 25 mph with gusts up to 50 mph expected above 1500 feet. * WHERE...Del Norte Interior, Northern Humboldt Interior, Southwestern Humboldt and Southern Humboldt Interior Counties. * WHEN...From 3 PM this afternoon to 7 AM PST Friday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 4, 1:07 AM PST | Frost Advisory | EKA | Mendocino | 7 hr |
| Mar 4, 2:12 PM PST | Winter Weather Advisory | EKA | Del Norte, Humboldt, Lake, Mendocino, Trinity | 36 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.