Alert archive / California / Frost Advisories in 2021
Frost Advisory 8, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Mar 11, 2021, 1:04 PM PST for Humboldt County, Mendocino County, California. It took effect at Mar 12, 2021, 12:00 AM PST. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Mar 11, 2021, 1:04 PM PST (21:04 UTC)
- In effect from
- Mar 12, 2021, 12:00 AM PST
- Expired
- Mar 12, 2021, 9:00 AM PST
- In force
- 9 hr
- Issued by
- NWS Eureka, CA
Counties Humboldt County, CA, Mendocino County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 71 km from the middle of the area, began a volume at 21:04 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, 9.1 hours before the alert went out and 266 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
- 689 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- -23 m²/s²
- 0-3 km storm-relative helicity
- 14 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
072 WWUS76 KEKA 112104 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 104 PM PST Thu Mar 11 2021 CAZ110-111-113>115-120515- /O.NEW.KEKA.FZ.W.0007.210312T0800Z-210312T1700Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southeastern Mendocino Interior-Northern Lake County- Southern Lake County- 104 PM PST Thu Mar 11 2021 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PST FRIDAY... * WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Portions of the Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake County and Southern Lake County. Locations include Covelo, Laytonville, Willits, Potter Valley, Ukiah, Hopland, Lakeport, and Upper Lake. * WHEN...From midnight tonight to 9 AM PST Friday. * 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. && $$ CAZ103-109-112-120515- /O.NEW.KEKA.FR.Y.0008.210312T0800Z-210312T1700Z/ Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior- 104 PM PST Thu Mar 11 2021 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PST FRIDAY... * WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...Portions of the Northern Humboldt Coast, Mendocino Coast and Southwestern Mendocino Interior Counties. Locations include Boonville, Navarro, inland areas near Fort Bragg, Carlotta, Eureka, Arcata, Blue Lake, and McKinleyville. * WHEN...From midnight tonight to 9 AM PST Friday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
3 follow-up statements
447 WWUS76 KEKA 120511 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 911 PM PST Thu Mar 11 2021 CAZ110-111-113>115-121315- /O.CON.KEKA.FZ.W.0007.210312T0800Z-210312T1700Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southeastern Mendocino Interior-Northern Lake County- Southern Lake County- 911 PM PST Thu Mar 11 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PST FRIDAY... * WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Portions of the Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake County and Southern Lake County. Locations include Covelo, Laytonville, Willits, Potter Valley, Ukiah, Hopland, Lakeport, and Upper Lake. * WHEN...From midnight tonight to 9 AM PST Friday. * 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. && $$ CAZ103-109-112-121315- /O.CON.KEKA.FR.Y.0008.210312T0800Z-210312T1700Z/ Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior- 911 PM PST Thu Mar 11 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST FRIDAY... * WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...Portions of the Northern Humboldt Coast, Mendocino Coast and Southwestern Mendocino Interior Counties. Locations include Boonville, Navarro, inland areas near Fort Bragg, Carlotta, Eureka, Arcata, Blue Lake, and McKinleyville. * WHEN...From midnight tonight to 9 AM PST Friday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
593 WWUS76 KEKA 121219 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 419 AM PST Fri Mar 12 2021 CAZ110-111-113>115-121700- /O.CON.KEKA.FZ.W.0007.000000T0000Z-210312T1700Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southeastern Mendocino Interior-Northern Lake County- Southern Lake County- 419 AM PST Fri Mar 12 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING... * WHAT...Sub-freezing temperatures as low as 29. * WHERE...Southeastern Mendocino Interior, Northeastern Mendocino Interior, Northern Lake County, Southern Lake County and Northwestern Mendocino Interior 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. && $$ CAZ103-109-112-121700- /O.CON.KEKA.FR.Y.0008.000000T0000Z-210312T1700Z/ Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior- 419 AM PST Fri Mar 12 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING... * WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...Mendocino Coast, Southwestern Mendocino Interior and Northern Humboldt Coast Counties. * WHEN...Until 9 AM PST this morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
143 WWUS76 KEKA 121655 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 855 AM PST Fri Mar 12 2021 CAZ110-111-113>115-121800- /O.EXP.KEKA.FZ.W.0007.000000T0000Z-210312T1700Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southeastern Mendocino Interior-Northern Lake County- Southern Lake County- 855 AM PST Fri Mar 12 2021 ...FREEZE WARNING WILL EXPIRE AT 9 AM PST THIS MORNING... $$ CAZ103-109-112-121800- /O.EXP.KEKA.FR.Y.0008.000000T0000Z-210312T1700Z/ Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior- 855 AM PST Fri Mar 12 2021 ...FROST ADVISORY WILL EXPIRE AT 9 AM PST THIS MORNING... $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 11, 1:04 PM PST | Freeze Warning | EKA | Lake, Mendocino | 20 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.