Alert archive / California / Frost Advisories in 2021
Frost Advisory 6, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Mar 7, 2021, 2:04 PM PST for Humboldt County, Mendocino County, California. It took effect at Mar 8, 2021, 12:00 AM PST. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Mar 7, 2021, 2:04 PM PST (22:04 UTC)
- In effect from
- Mar 8, 2021, 12:00 AM PST
- Expired
- Mar 8, 2021, 7:00 AM PST
- In force
- 7 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 22:08 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, 10.1 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
- 1554 m above ground
- 0-6 km bulk shear
- 91 kt
- 0-1 km storm-relative helicity
- 200 m²/s²
- 0-3 km storm-relative helicity
- 299 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
320 WWUS76 KEKA 072204 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 204 PM PST Sun Mar 7 2021 CAZ110-111-114-115-080615- /O.NEW.KEKA.FZ.W.0005.210308T0800Z-210308T1500Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County-Southern Lake County- 204 PM PST Sun Mar 7 2021 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 7 AM PST MONDAY... * 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 7 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. && $$ CAZ103-109-112-113-080615- /O.NEW.KEKA.FR.Y.0006.210308T0800Z-210308T1500Z/ Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- 204 PM PST Sun Mar 7 2021 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 7 AM PST MONDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Northern Humboldt Coast, Mendocino Coast, Southwestern Mendocino Interior and Southeastern Mendocino Interior Counties. * WHEN...From midnight tonight to 7 AM PST Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
3 follow-up statements
779 WWUS76 KEKA 080604 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1004 PM PST Sun Mar 7 2021 CAZ110-111-114-115-081300- /O.CON.KEKA.FZ.W.0005.210308T0800Z-210308T1500Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County-Southern Lake County- 1004 PM PST Sun Mar 7 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 7 AM PST MONDAY... * WHAT...Sub-freezing temperatures as low as 28 expected. * WHERE...Northeastern Mendocino Interior, Northern Lake County, Southern Lake County and Northwestern Mendocino Interior Counties. * WHEN...Until 7 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. && $$ CAZ103-109-112-113-081300- /O.CON.KEKA.FR.Y.0006.210308T0800Z-210308T1500Z/ Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- 1004 PM PST Sun Mar 7 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 7 AM PST MONDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Mendocino Coast, Southwestern Mendocino Interior, Southeastern Mendocino Interior and Northern Humboldt Coast Counties. * WHEN...Until 7 AM PST Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
055 WWUS76 KEKA 081302 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 502 AM PST Mon Mar 8 2021 CAZ110-111-114-115-081500- /O.CON.KEKA.FZ.W.0005.000000T0000Z-210308T1500Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County-Southern Lake County- 502 AM PST Mon Mar 8 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 7 AM PST THIS MORNING... * WHAT...Sub-freezing temperatures as low as 28 expected. * WHERE...Northeastern Mendocino Interior, Northern Lake County, Southern Lake County and Northwestern Mendocino Interior Counties. * WHEN...Until 7 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. && $$ CAZ103-109-112-113-081500- /O.CON.KEKA.FR.Y.0006.000000T0000Z-210308T1500Z/ Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- 502 AM PST Mon Mar 8 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 7 AM PST THIS MORNING... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Mendocino Coast, Southwestern Mendocino Interior, Southeastern Mendocino Interior and Northern Humboldt Coast Counties. * WHEN...Until 7 AM PST Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
689 WWUS76 KEKA 081510 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 710 AM PST Mon Mar 8 2021 CAZ110-111-114-115-081615- /O.EXP.KEKA.FZ.W.0005.000000T0000Z-210308T1500Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County-Southern Lake County- 710 AM PST Mon Mar 8 2021 ...FREEZE WARNING HAS EXPIRED... $$ CAZ103-109-112-113-081615- /O.EXP.KEKA.FR.Y.0006.000000T0000Z-210308T1500Z/ Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- 710 AM PST Mon Mar 8 2021 ...FROST ADVISORY HAS EXPIRED... $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 7, 2:04 PM PST | Freeze Warning | EKA | Lake, Mendocino | 17 hr |
| Mar 7, 2:09 PM PST | Winter Weather Advisory | EKA | Del Norte, Humboldt, Lake, Mendocino, Trinity | 68 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.