Alert archive / California / Frost Advisories in 2023
Frost Advisory 21, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Jun 20, 2023, 2:11 PM PDT for Humboldt County, Trinity County, California. It took effect at Jun 21, 2023, 5:00 AM PDT. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- Jun 20, 2023, 2:11 PM PDT (21:11 UTC)
- In effect from
- Jun 21, 2023, 5:00 AM PDT
- Expired
- Jun 21, 2023, 9:00 AM PDT
- In force
- 4 hr
- Issued by
- NWS Eureka, CA
Counties Humboldt County, CA, Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 69 km from the middle of the area, began a volume at 21:11 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, 9.2 hours before the alert went out and 197 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
- 49 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 479 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 52 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
671 WWUS76 KEKA 202111 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 211 PM PDT Tue Jun 20 2023 CAZ106-108-210515- /O.NEW.KEKA.FR.Y.0021.230621T1200Z-230621T1600Z/ Southern Humboldt Interior-Southern Trinity- 211 PM PDT Tue Jun 20 2023 ...FROST ADVISORY IN EFFECT FROM 5 AM TO 9 AM PDT WEDNESDAY... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Southern Humboldt Interior and Southern Trinity Counties. * WHEN...From 5 AM to 9 AM PDT Wednesday. * 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. && $$
2 follow-up statements
111 WWUS76 KEKA 210524 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1024 PM PDT Tue Jun 20 2023 CAZ106-108-211330- /O.CON.KEKA.FR.Y.0021.230621T1200Z-230621T1600Z/ Southern Humboldt Interior-Southern Trinity- 1024 PM PDT Tue Jun 20 2023 ...FROST ADVISORY REMAINS IN EFFECT FROM 5 AM TO 9 AM PDT WEDNESDAY... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Southern Humboldt Interior and Southern Trinity Counties. * WHEN...From 5 AM to 9 AM PDT Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
175 WWUS76 KEKA 211336 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 636 AM PDT Wed Jun 21 2023 CAZ106-108-211600- /O.CON.KEKA.FR.Y.0021.000000T0000Z-230621T1600Z/ Southern Humboldt Interior-Southern Trinity- 636 AM PDT Wed Jun 21 2023 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM THIS MORNING... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Southern Humboldt Interior and Southern Trinity counties. * WHEN...From 5 AM to 9 AM Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 2:42 PM PDT | Small Craft Advisory | EKA | 48 hr |
Nearby
Frost Advisories in California, 2023Every frost advisory in 2023
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.