Alert archive / California / Frost Advisories in 2021
Frost Advisory 33, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at May 6, 2021, 3:11 AM PDT for Humboldt County, Mendocino County, Trinity County, California. It took effect at May 7, 2021, 3:00 AM PDT. It was in force for 5 hr.
The area
The counties it named.
The facts
- Issued
- May 6, 2021, 3:11 AM PDT (10:11 UTC)
- In effect from
- May 7, 2021, 3:00 AM PDT
- Expired
- May 7, 2021, 8:00 AM PDT
- In force
- 5 hr
- Issued by
- NWS Eureka, CA
Counties Humboldt County, CA, Mendocino County, CA, Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 73 km from the middle of the area, began a volume at 10:16 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 00:00Z, 10.2 hours before the alert went out and 241 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
- 3550 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- 114 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
632 WWUS76 KEKA 061011 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 311 AM PDT Thu May 6 2021 CAZ108-062230- /O.NEW.KEKA.FR.Y.0033.210507T1000Z-210507T1500Z/ Southern Trinity- 311 AM PDT Thu May 6 2021 ...FROST ADVISORY IN EFFECT FROM 3 AM TO 8 AM PDT FRIDAY... * WHAT...Temperatures as low as 35 will result in frost formation. * WHERE...Southern Trinity County. * WHEN...From 3 AM to 8 AM PDT Friday. * 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. && $$
3 follow-up statements
222 WWUS76 KEKA 062135 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 235 PM PDT Thu May 6 2021 CAZ106-111-070545- /O.EXA.KEKA.FR.Y.0033.210507T1000Z-210507T1500Z/ Southern Humboldt Interior-Northeastern Mendocino Interior- 235 PM PDT Thu May 6 2021 ...FROST ADVISORY IN EFFECT FROM 3 AM TO 8 AM PDT FRIDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Southern Humboldt Interior and Northeastern Mendocino Interior Counties. * WHEN...From 3 AM to 8 AM PDT Friday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ108-070545- /O.CON.KEKA.FR.Y.0033.210507T1000Z-210507T1500Z/ Southern Trinity- 235 PM PDT Thu May 6 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 3 AM TO 8 AM PDT FRIDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Southern Trinity County. * WHEN...From 3 AM to 8 AM PDT Friday. * 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. && $$
302 WWUS76 KEKA 071049 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 349 AM PDT Fri May 7 2021 CAZ111-071200- /O.CAN.KEKA.FR.Y.0033.000000T0000Z-210507T1500Z/ Northeastern Mendocino Interior- 349 AM PDT Fri May 7 2021 ...FROST ADVISORY IS CANCELLED... Breezy winds are keeping most areas in the upper 30s to mid 40s so have cancelled the frost advisory. $$ CAZ106-108-071500- /O.CON.KEKA.FR.Y.0033.000000T0000Z-210507T1500Z/ Southern Humboldt Interior-Southern Trinity- 349 AM PDT Fri May 7 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PDT THIS MORNING... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Southern Trinity and Southern Humboldt Interior Counties. * WHEN...Until 8 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. && $$
687 WWUS76 KEKA 071453 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 753 AM PDT Fri May 7 2021 CAZ106-108-071600- /O.EXP.KEKA.FR.Y.0033.000000T0000Z-210507T1500Z/ Southern Humboldt Interior-Southern Trinity- 753 AM PDT Fri May 7 2021 ...FROST ADVISORY WILL EXPIRE AT 8 AM PDT THIS MORNING... $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 3:00 AM PDT | Gale Warning | EKA | 5 days | |
| May 6, 3:00 AM PDT | Hazardous Seas Warning | EKA | 54 hr | |
| May 6, 8:44 AM PDT | Small Craft Advisory | EKA | 33 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.