Alert archive / California / Frost Advisories in 2021
Frost Advisory 25, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Apr 9, 2021, 2:20 PM PDT for Del Norte County, Humboldt County, Mendocino County, California. It took effect at Apr 10, 2021, 12:00 AM PDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Apr 9, 2021, 2:20 PM PDT (21:20 UTC)
- In effect from
- Apr 10, 2021, 12:00 AM PDT
- Expired
- Apr 10, 2021, 9:00 AM PDT
- In force
- 9 hr
- Issued by
- NWS Eureka, CA
Counties Del Norte County, CA, Humboldt County, CA, Mendocino County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 47 km from the middle of the area, began a volume at 21:19 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, 9.3 hours before the alert went out and 210 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
- 1035 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 22 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
947 WWUS76 KEKA 092120 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 220 PM PDT Fri Apr 9 2021 CAZ102-104>106-110>112-100530- /O.NEW.KEKA.FR.Y.0025.210410T0700Z-210410T1600Z/ Del Norte Interior-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior- 220 PM PDT Fri Apr 9 2021 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM SATURDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Del Norte Interior, Humboldt Interior, Northwestern Mendocino Interior, Northeastern Mendocino Interior and Southwestern Mendocino Interior counties. * WHEN...From midnight tonight to 9 AM Saturday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. $$
4 follow-up statements
128 WWUS76 KEKA 092231 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 331 PM PDT Fri Apr 9 2021 CAZ101-109-113-100645- /O.EXA.KEKA.FR.Y.0025.210410T0700Z-210410T1600Z/ Coastal Del Norte-Mendocino Coast-Southeastern Mendocino Interior- 331 PM PDT Fri Apr 9 2021 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT SATURDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Coastal Del Norte, Mendocino Coast and Southeastern Mendocino Interior Counties. * WHEN...From midnight tonight to 9 AM PDT Saturday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ102-104>106-110>112-100645- /O.CON.KEKA.FR.Y.0025.210410T0700Z-210410T1600Z/ Del Norte Interior-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior- 331 PM PDT Fri Apr 9 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT SATURDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Del Norte Interior, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Humboldt Interior, Southwestern Humboldt, Southern Humboldt Interior and Southwestern Mendocino Interior Counties. * WHEN...From midnight tonight 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. && $$
455 WWUS76 KEKA 100421 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 921 PM PDT Fri Apr 9 2021 CAZ101-102-104>106-109>113-101230- /O.CON.KEKA.FR.Y.0025.210410T0700Z-210410T1600Z/ Coastal Del Norte-Del Norte Interior-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Mendocino Coast-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southwestern Mendocino Interior- Southeastern Mendocino Interior- 921 PM PDT Fri Apr 9 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT SATURDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Portions of northwest California. * WHEN...Until 9 AM PDT Saturday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
325 WWUS76 KEKA 100954 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 254 AM PDT Sat Apr 10 2021 CAZ101-102-104>106-109>113-101600- /O.CON.KEKA.FR.Y.0025.000000T0000Z-210410T1600Z/ Coastal Del Norte-Del Norte Interior-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Mendocino Coast-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southwestern Mendocino Interior- Southeastern Mendocino Interior- 254 AM PDT Sat Apr 10 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Portions of northwest California. * 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. && $$
950 WWUS76 KEKA 101612 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 912 AM PDT Sat Apr 10 2021 CAZ101-102-104>106-109>113-101715- /O.EXP.KEKA.FR.Y.0025.000000T0000Z-210410T1600Z/ Coastal Del Norte-Del Norte Interior-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Mendocino Coast-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southwestern Mendocino Interior- Southeastern Mendocino Interior- 912 AM PDT Sat Apr 10 2021 ...FROST ADVISORY HAS EXPIRED... More frost is expected tonight and Sunday morning. $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 9, 2:52 AM PDT | Gale Warning | EKA | 5 days |
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.