Alert archive / California / Frost Advisories in 2021
Frost Advisory 27, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Apr 11, 2021, 2:21 PM PDT for Del Norte County, Humboldt County, Mendocino County, California. It took effect at Apr 12, 2021, 12:00 AM PDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Apr 11, 2021, 2:21 PM PDT (21:21 UTC)
- In effect from
- Apr 12, 2021, 12:00 AM PDT
- Expired
- Apr 12, 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 21:20 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, 9.4 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
- 822 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
417 WWUS76 KEKA 112121 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 221 PM PDT Sun Apr 11 2021 CAZ103>106-109>111-120530- /O.NEW.KEKA.FR.Y.0027.210412T0700Z-210412T1600Z/ Northern Humboldt Coast-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Mendocino Coast-Northwestern Mendocino Interior- Northeastern Mendocino Interior- 221 PM PDT Sun Apr 11 2021 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM MONDAY... * WHAT...Temperatures as low as 35 will result in frost formation. * WHERE...Humboldt County, Mendocino Coast, Northwestern Mendocino Interior, and Northeastern Mendocino Interior. * WHEN...From midnight tonight to 9 AM Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. $$
3 follow-up statements
550 WWUS76 KEKA 120329 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 829 PM PDT Sun Apr 11 2021 CAZ102-121130- /O.EXA.KEKA.FR.Y.0027.210412T0700Z-210412T1600Z/ Del Norte Interior- 829 PM PDT Sun Apr 11 2021 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT MONDAY... * WHAT...Temperatures as low as 36 will result in frost formation. * WHERE...Del Norte Interior County. * WHEN...From midnight tonight to 9 AM PDT Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ103>106-109>111-121130- /O.CON.KEKA.FR.Y.0027.210412T0700Z-210412T1600Z/ Northern Humboldt Coast-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Mendocino Coast-Northwestern Mendocino Interior- Northeastern Mendocino Interior- 829 PM PDT Sun Apr 11 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT MONDAY... * WHAT...Temperatures as low as 36 will result in frost formation. * WHERE...Mendocino Coast, Northern Humboldt Coast, Northeastern Mendocino Interior, Northern Humboldt Interior, Southwestern Humboldt, Southern Humboldt Interior and Northwestern Mendocino Interior Counties. * WHEN...From midnight tonight 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. && $$
183 WWUS76 KEKA 120854 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 154 AM PDT Mon Apr 12 2021 CAZ102>106-109>111-121600- /O.CON.KEKA.FR.Y.0027.000000T0000Z-210412T1600Z/ Del Norte Interior-Northern Humboldt Coast-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Mendocino Coast-Northwestern Mendocino Interior- Northeastern Mendocino Interior- 154 AM PDT Mon Apr 12 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Portions of Mendocino, Humboldt, and Del Norte counties. * WHEN...Until 9 AM PDT this morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
946 WWUS76 KEKA 121603 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 903 AM PDT Mon Apr 12 2021 CAZ102>106-109>111-121715- /O.EXP.KEKA.FR.Y.0027.000000T0000Z-210412T1600Z/ Del Norte Interior-Northern Humboldt Coast-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Mendocino Coast-Northwestern Mendocino Interior- Northeastern Mendocino Interior- 903 AM PDT Mon Apr 12 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 |
|---|---|---|---|---|
| Apr 11, 2:14 PM PDT | Hazardous Seas Warning | EKA | 67 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.