Alert archive / California / Frost Advisories in 2021
Frost Advisory 9, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Mar 12, 2021, 1:43 PM PST for Mendocino County, California. It took effect at Mar 13, 2021, 12:00 AM PST. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Mar 12, 2021, 1:43 PM PST (21:43 UTC)
- In effect from
- Mar 13, 2021, 12:00 AM PST
- Expired
- Mar 13, 2021, 9:00 AM PST
- In force
- 9 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 21:41 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
Medford/Jackson, OR (KMFR), launched 12:00Z, 9.7 hours before the alert went out and 331 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
- 782 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- -7 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
739 WWUS76 KEKA 122143 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 143 PM PST Fri Mar 12 2021 CAZ110-111-114-115-130545- /O.NEW.KEKA.FZ.W.0008.210313T0800Z-210313T1700Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County-Southern Lake County- 143 PM PST Fri Mar 12 2021 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PST SATURDAY... * WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Portions of the Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Lake County and Southern Lake County. Locations include Laytonville, Covelo, Potter Valley, Upper Lake and Lakeport. * WHEN...From midnight tonight to 9 AM PST Saturday. * 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. && $$ CAZ112-113-130545- /O.NEW.KEKA.FR.Y.0009.210313T0800Z-210313T1700Z/ Southwestern Mendocino Interior-Southeastern Mendocino Interior- 143 PM PST Fri Mar 12 2021 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PST SATURDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Portions of the Southwestern Mendocino Interior and Southeastern Mendocino Interior Counties. Locations include Ukiah, Hopland, Navarro, Philo, and Boonville. * WHEN...From midnight tonight to 9 AM PST Saturday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
3 follow-up statements
312 WWUS76 KEKA 130302 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 702 PM PST Fri Mar 12 2021 CAZ110-111-114-115-131115- /O.CON.KEKA.FZ.W.0008.210313T0800Z-210313T1700Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County-Southern Lake County- 702 PM PST Fri Mar 12 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PST SATURDAY... * WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Lake County and Southern Lake County. * WHEN...From midnight tonight to 9 AM PST Saturday. * 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. && $$ CAZ109-131115- /O.EXA.KEKA.FR.Y.0009.210313T0800Z-210313T1700Z/ Mendocino Coast- 702 PM PST Fri Mar 12 2021 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PST SATURDAY... * WHAT...Temperatures as low as 36 will result in frost formation. * WHERE...Mendocino Coast County. * WHEN...From midnight tonight to 9 AM PST Saturday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ112-113-131115- /O.CON.KEKA.FR.Y.0009.210313T0800Z-210313T1700Z/ Southwestern Mendocino Interior-Southeastern Mendocino Interior- 702 PM PST Fri Mar 12 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PST SATURDAY... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Southwestern Mendocino Interior and Southeastern Mendocino Interior Counties. * WHEN...From midnight tonight to 9 AM PST Saturday. * 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. && $$
653 WWUS76 KEKA 131100 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 300 AM PST Sat Mar 13 2021 CAZ110-111-114-115-131700- /O.CON.KEKA.FZ.W.0008.000000T0000Z-210313T1700Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County-Southern Lake County- 300 AM PST Sat Mar 13 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING... * WHAT...Sub-freezing temperatures as low as 29. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior, Lake County. * WHEN...Until 9 AM PST this morning. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing.. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ109-112-113-131700- /O.CON.KEKA.FR.Y.0009.000000T0000Z-210313T1700Z/ Mendocino Coast-Southwestern Mendocino Interior- Southeastern Mendocino Interior- 300 AM PST Sat Mar 13 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Mendocino Coast, Southwestern Mendocino Interior and Southeastern Mendocino Interior. * 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. && $$
078 WWUS76 KEKA 131656 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 856 AM PST Sat Mar 13 2021 CAZ110-111-114-115-131800- /O.EXP.KEKA.FZ.W.0008.000000T0000Z-210313T1700Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County-Southern Lake County- 856 AM PST Sat Mar 13 2021 ...FREEZE WARNING WILL EXPIRE AT 9 AM PST THIS MORNING... Temperatures are starting to warm above freezing this morning. $$ CAZ109-112-113-131800- /O.EXP.KEKA.FR.Y.0009.000000T0000Z-210313T1700Z/ Mendocino Coast-Southwestern Mendocino Interior- Southeastern Mendocino Interior- 856 AM PST Sat Mar 13 2021 ...FROST ADVISORY WILL EXPIRE AT 9 AM PST THIS MORNING... Temperatures are starting to warm this morning. $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 12, 1:43 PM PST | Freeze Warning | EKA | Lake, Mendocino | 19 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.