Alert archive / California / Frost Advisories in 2021
Frost Advisory 18, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Mar 26, 2021, 2:32 PM PDT for Humboldt County, Lake County, Mendocino County, California. It took effect at Mar 27, 2021, 1:00 AM PDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Mar 26, 2021, 2:32 PM PDT (21:32 UTC)
- In effect from
- Mar 27, 2021, 1:00 AM PDT
- Expired
- Mar 27, 2021, 9:00 AM PDT
- In force
- 8 hr
- Issued by
- NWS Eureka, CA
Counties Humboldt County, CA, Lake County, CA, Mendocino County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 115 km from the middle of the area, began a volume at 21:37 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 246 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
- 1438 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- 81 m²/s²
- 0-3 km storm-relative helicity
- 81 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
075 WWUS76 KEKA 262132 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 232 PM PDT Fri Mar 26 2021 CAZ110>112-114-115-270545- /O.NEW.KEKA.FR.Y.0018.210327T0800Z-210327T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior-Northern Lake-Southern Lake- 232 PM PDT Fri Mar 26 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM PDT SATURDAY... * WHAT...Temperatures in the low to mid 30s will result in frost formation. * WHERE...Portions of Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southwestern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...From 1 AM to 9 AM PDT 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. && $$
4 follow-up statements
374 WWUS76 KEKA 262327 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 427 PM PDT Fri Mar 26 2021 CAZ103-109-113-270730- /O.EXA.KEKA.FR.Y.0018.210327T0800Z-210327T1600Z/ Northern Humboldt Coast-Mendocino Coast- Southeastern Mendocino Interior- 427 PM PDT Fri Mar 26 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM PDT SATURDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Northern Humboldt Coast, Mendocino Coast and Southeastern Mendocino Interior Counties. * WHEN...From 1 AM to 9 AM PDT Saturday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ110>112-114-115-270730- /O.CON.KEKA.FR.Y.0018.210327T0800Z-210327T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior-Northern Lake-Southern Lake- 427 PM PDT Fri Mar 26 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM PDT SATURDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Southwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Lake, Northern Lake, Southern Lake and Northwestern Mendocino Interior Counties. * WHEN...From 1 AM to 9 AM PDT 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. && $$
683 WWUS76 KEKA 270439 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 939 PM PDT Fri Mar 26 2021 CAZ103-109>115-271245- /O.CON.KEKA.FR.Y.0018.210327T0800Z-210327T1600Z/ Northern Humboldt Coast-Mendocino Coast- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 939 PM PDT Fri Mar 26 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM PDT SATURDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Mendocino Coast, Southwestern Mendocino Interior, Southeastern Mendocino Interior, Northern Humboldt Coast, Northeastern Mendocino Interior, Northern Lake, Southern Lake and Northwestern Mendocino Interior Counties. * WHEN...From 1 AM to 9 AM PDT Saturday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
998 WWUS76 KEKA 271246 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 546 AM PDT Sat Mar 27 2021 CAZ103-109>115-271600- /O.CON.KEKA.FR.Y.0018.000000T0000Z-210327T1600Z/ Northern Humboldt Coast-Mendocino Coast- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 546 AM PDT Sat Mar 27 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Mendocino Coast, Southwestern Mendocino Interior, Southeastern Mendocino Interior, Northern Humboldt Coast, Northeastern Mendocino Interior, Northern Lake, Southern Lake and Northwestern Mendocino Interior Counties. * WHEN...From 1 AM to 9 AM PDT 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. && $$
889 WWUS76 KEKA 271546 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 846 AM PDT Sat Mar 27 2021 CAZ103-109>115-271700- /O.EXP.KEKA.FR.Y.0018.000000T0000Z-210327T1600Z/ Northern Humboldt Coast-Mendocino Coast- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 846 AM PDT Sat Mar 27 2021 ...FROST ADVISORY WILL EXPIRE AT 9 AM PDT THIS MORNING... $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 26, 2:41 AM PDT | Small Craft Advisory | EKA | 37 hr | |
| Mar 26, 2:41 AM PDT | Hazardous Seas Warning | EKA | 24 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.