Alert archive / California / Frost Advisories in 2021
Frost Advisory 2, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Mar 1, 2021, 2:42 PM PST for Humboldt County, Lake County, Mendocino County, California. It took effect at Mar 1, 2021, 11:00 PM PST. It was in force for 10 hr.
The area
The counties it named.
The facts
- Issued
- Mar 1, 2021, 2:42 PM PST (22:42 UTC)
- In effect from
- Mar 1, 2021, 11:00 PM PST
- Expired
- Mar 2, 2021, 9:00 AM PST
- In force
- 10 hr
- Issued by
- NWS Eureka, CA
Counties Humboldt County, CA, Lake County, CA, Mendocino County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 115 km from the middle of the area, began a volume at 22:46 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 246 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
- 2486 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 69 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
588 WWUS76 KEKA 012242 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 242 PM PST Mon Mar 1 2021 CAZ110>115-021700- /O.NEW.KEKA.FR.Y.0002.210302T0700Z-210302T1700Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake County-Southern Lake County- 242 PM PST Mon Mar 1 2021 ...FROST ADVISORY IN EFFECT FROM 11 PM THIS EVENING TO 9 AM TUESDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Portions of Lake and interior Mendocino counties. * WHEN...From 11 PM this evening to 9 AM Tuesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. $$
2 follow-up statements
484 WWUS76 KEKA 020234 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 634 PM PST Mon Mar 1 2021 CAZ111-114-021700- /O.UPG.KEKA.FR.Y.0002.210302T0700Z-210302T1700Z/ /O.NEW.KEKA.FZ.W.0002.210302T0700Z-210302T1700Z/ Northeastern Mendocino Interior-Northern Lake County- 634 PM PST Mon Mar 1 2021 ...FREEZE WARNING IN EFFECT FROM 11 PM THIS EVENING TO 9 AM PST TUESDAY... * WHAT...Sub-freezing temperatures as low as 30 expected. * WHERE...Northeastern Mendocino Interior and Northern Lake County, including Covelo and Lake Pillsbury. * WHEN...From 11 PM this evening to 9 AM PST Tuesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing.. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ110-112-113-115-021700- /O.CON.KEKA.FR.Y.0002.210302T0700Z-210302T1700Z/ Northwestern Mendocino Interior-Southwestern Mendocino Interior- Southeastern Mendocino Interior-Southern Lake County- 634 PM PST Mon Mar 1 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 11 PM THIS EVENING TO 9 AM PST TUESDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Southwestern Mendocino Interior, Southeastern Mendocino Interior, Northwestern Mendocino Interior and Southern Lake County...including Ukiah, Willits, Laytonville, Boonville, Lakeport, Clearlake, and Middletown. * WHEN...From 11 PM this evening to 9 AM PST Tuesday. * 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. && $$
976 WWUS76 KEKA 021159 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 359 AM PST Tue Mar 2 2021 CAZ110-115-021700- /O.UPG.KEKA.FR.Y.0002.000000T0000Z-210302T1700Z/ /O.EXA.KEKA.FZ.W.0002.000000T0000Z-210302T1700Z/ Northwestern Mendocino Interior-Southern Lake County- 359 AM PST Tue Mar 2 2021 ...FREEZE WARNING IN EFFECT UNTIL 9 AM PST THIS MORNING... * WHAT...Sub-freezing temperatures as low as 30. * WHERE...Northwestern Mendocino Interior and Southern Lake County Counties. * WHEN...Until 9 AM PST this morning. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing.. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ111-114-021700- /O.CON.KEKA.FZ.W.0002.000000T0000Z-210302T1700Z/ Northeastern Mendocino Interior-Northern Lake County- 359 AM PST Tue Mar 2 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING... * WHAT...Sub-freezing temperatures as low as 30. * WHERE...Northeastern Mendocino Interior and Northern Lake County Counties. * WHEN...Until 9 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. && $$ CAZ103-021700- /O.EXA.KEKA.FR.Y.0002.000000T0000Z-210302T1700Z/ Northern Humboldt Coast- 359 AM PST Tue Mar 2 2021 ...FROST ADVISORY IN EFFECT UNTIL 9 AM PST THIS MORNING... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Northern Humboldt Coast County. * WHEN...Until 9 AM PST this morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ112-113-021700- /O.CON.KEKA.FR.Y.0002.000000T0000Z-210302T1700Z/ Southwestern Mendocino Interior-Southeastern Mendocino Interior- 359 AM PST Tue Mar 2 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Southwestern Mendocino Interior and Southeastern 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. 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. && $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 1, 2:56 PM PST | Small Craft Advisory | EKA | 48 hr |
Nearby
Frost Advisories in California, 2021Every frost advisory 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.