Alert archive / California / Frost Advisories in 2021
Frost Advisory 19, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Mar 28, 2021, 2:29 PM PDT for Lake County, Mendocino County, California. It took effect at Mar 29, 2021, 1:00 AM PDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Mar 28, 2021, 2:29 PM PDT (21:29 UTC)
- In effect from
- Mar 29, 2021, 1:00 AM PDT
- Expired
- Mar 29, 2021, 9:00 AM PDT
- In force
- 8 hr
- Issued by
- NWS Eureka, CA
Counties Lake County, CA, Mendocino County, CA
The radar
The Beale AFB radar (KBBX), 128 km from the middle of the area, began a volume at 21:30 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, 9.5 hours before the alert went out and 188 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
- 2503 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 7 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
081 WWUS76 KEKA 282129 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 229 PM PDT Sun Mar 28 2021 CAZ110>115-290530- /O.NEW.KEKA.FR.Y.0019.210329T0800Z-210329T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 229 PM PDT Sun Mar 28 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM PDT MONDAY... * WHAT...Temperatures in the low to mid 30s will result in frost formation. * WHERE...Portions of the Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southwestern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...From 1 AM to 9 AM PDT 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. && $$
3 follow-up statements
782 WWUS76 KEKA 290531 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1031 PM PDT Sun Mar 28 2021 CAZ110>115-291600- /O.CON.KEKA.FR.Y.0019.210329T0800Z-210329T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 1031 PM PDT Sun Mar 28 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT MONDAY... * WHAT...Temperatures in the low to mid 30s will result in frost formation. * WHERE...Portions of the Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southwestern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...From 1 AM to 9 AM PDT Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
321 WWUS76 KEKA 291051 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 351 AM PDT Mon Mar 29 2021 CAZ110-111-114-115-291900- /O.NEW.KEKA.FZ.A.0004.210330T0600Z-210330T1500Z/ /O.CON.KEKA.FR.Y.0019.000000T0000Z-210329T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake-Southern Lake- 351 AM PDT Mon Mar 29 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... ...FREEZE WATCH IN EFFECT FROM THIS EVENING THROUGH TUESDAY MORNING... * WHAT...For the Frost Advisory, temperatures as low as 32 will result in frost formation. For the Freeze Watch, sub-freezing temperatures as low as 29 possible. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...For the Frost Advisory, until 9 AM PDT this morning. For the Freeze Watch, from this evening through Tuesday morning. * IMPACTS...Frost and freeze conditions could 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. && $$ CAZ112-113-291600- /O.CON.KEKA.FR.Y.0019.000000T0000Z-210329T1600Z/ Southwestern Mendocino Interior-Southeastern Mendocino Interior- 351 AM PDT Mon Mar 29 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Temperatures as low as 36 will result in frost formation. * WHERE...Southwestern Mendocino Interior and Southeastern Mendocino Interior Counties. * WHEN...Until 9 AM PDT this morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
159 WWUS76 KEKA 291545 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 845 AM PDT Mon Mar 29 2021 CAZ110-111-114-115-292345- /O.EXP.KEKA.FR.Y.0019.000000T0000Z-210329T1600Z/ /O.CON.KEKA.FZ.A.0004.210330T0600Z-210330T1500Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake-Southern Lake- 845 AM PDT Mon Mar 29 2021 ...FREEZE WATCH REMAINS IN EFFECT FROM THIS EVENING THROUGH TUESDAY MORNING... ...FROST ADVISORY WILL EXPIRE AT 9 AM PDT THIS MORNING... * WHAT...Sub-freezing temperatures as low as 29 possible. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...From this evening through Tuesday morning. * IMPACTS...Frost and freeze conditions could 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. && $$ CAZ112-113-291645- /O.EXP.KEKA.FR.Y.0019.000000T0000Z-210329T1600Z/ Southwestern Mendocino Interior-Southeastern Mendocino Interior- 845 AM PDT Mon Mar 29 2021 ...FROST ADVISORY WILL EXPIRE AT 9 AM PDT THIS MORNING... $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 28, 2:35 AM PDT | Gale Warning | EKA | 69 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.