Alert archive / California / Frost Advisories in 2021
Frost Advisory 15, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Mar 23, 2021, 2:04 PM PDT for Humboldt County, Mendocino County, California. It took effect at Mar 24, 2021, 12:00 AM PDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Mar 23, 2021, 2:04 PM PDT (21:04 UTC)
- In effect from
- Mar 24, 2021, 12:00 AM PDT
- Expired
- Mar 24, 2021, 9:00 AM PDT
- In force
- 9 hr
- Issued by
- NWS Eureka, CA
Counties Humboldt County, CA, Mendocino County, CA
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
- 733 m above ground
- 0-6 km bulk shear
- 95 kt
- 0-1 km storm-relative helicity
- 71 m²/s²
- 0-3 km storm-relative helicity
- 69 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
920 WWUS76 KEKA 232104 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 204 PM PDT Tue Mar 23 2021 CAZ110-111-114-240515- /O.NEW.KEKA.FZ.W.0014.210324T0700Z-210324T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 204 PM PDT Tue Mar 23 2021 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT WEDNESDAY... * WHAT...Sub-freezing temperatures as low as 31 expected. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior and Northern Lake Counties. * WHEN...From midnight tonight to 9 AM PDT Wednesday. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. 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. && $$ CAZ103-109-112-113-115-240515- /O.NEW.KEKA.FR.Y.0015.210324T0700Z-210324T1600Z/ Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 204 PM PDT Tue Mar 23 2021 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT WEDNESDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Northern Humboldt Coast, Mendocino Coast, Southwestern Mendocino Interior, Southeastern Mendocino Interior and Southern Lake Counties. * WHEN...From midnight tonight to 9 AM PDT Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
2 follow-up statements
882 WWUS76 KEKA 240513 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1013 PM PDT Tue Mar 23 2021 CAZ110-111-114-241600- /O.CON.KEKA.FZ.W.0014.210324T0700Z-210324T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 1013 PM PDT Tue Mar 23 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM WEDNESDAY... * WHAT...Sub-freezing temperatures as low as 32 expected. * WHERE...Northeastern Mendocino Interior, Northern Lake, and Northwestern Mendocino Interior counties. * WHEN...Until 9 AM Wednesday. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. $$ CAZ103-109-112-113-115-241600- /O.CON.KEKA.FR.Y.0015.210324T0700Z-210324T1600Z/ Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 1013 PM PDT Tue Mar 23 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM WEDNESDAY... * WHAT...Temperatures as low as 36 will result in frost formation. * WHERE...Mendocino Coast, Southwestern Mendocino Interior, Southeastern Mendocino Interior, Northern Humboldt Coast, and Southern Lake counties. * WHEN...Until 9 AM Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. $$
734 WWUS76 KEKA 241555 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 855 AM PDT Wed Mar 24 2021 CAZ110-111-114-241700- /O.EXP.KEKA.FZ.W.0014.000000T0000Z-210324T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 855 AM PDT Wed Mar 24 2021 ...FREEZE WARNING WILL EXPIRE AT 9 AM PDT THIS MORNING... $$ CAZ103-109-112-113-115-241700- /O.EXP.KEKA.FR.Y.0015.000000T0000Z-210324T1600Z/ Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 855 AM PDT Wed Mar 24 2021 ...FROST ADVISORY WILL EXPIRE AT 9 AM PDT THIS MORNING... $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 23, 2:04 PM PDT | 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.