Alert archive / California / Frost Advisories in 2021
Frost Advisory 45, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Oct 10, 2021, 2:55 PM PDT for Humboldt County, Trinity County, California. It took effect at Oct 11, 2021, 2:00 AM PDT. It was in force for 105 min.
The area
The counties it named.
The facts
- Issued
- Oct 10, 2021, 2:55 PM PDT (21:55 UTC)
- In effect from
- Oct 11, 2021, 2:00 AM PDT
- Expired
- Oct 11, 2021, 3:45 AM PDT
- In force
- 105 min
- 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 21:57 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, 9.9 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1058 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 6 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
021 WWUS76 KEKA 102155 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 255 PM PDT Sun Oct 10 2021 CAZ106-108-110600- /O.NEW.KEKA.FR.Y.0045.211011T0900Z-211011T1600Z/ /O.NEW.KEKA.FZ.A.0007.211012T0900Z-211012T1600Z/ Southern Humboldt Interior-Southern Trinity- 255 PM PDT Sun Oct 10 2021 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 9 AM PDT MONDAY... ...FREEZE WATCH IN EFFECT FROM LATE MONDAY NIGHT THROUGH TUESDAY MORNING... * WHAT...For the Frost Advisory, temperatures as low as 32 will result in frost formation. For the Freeze Watch, sub-freezing temperatures as low as 27 possible. * WHERE...Southern Humboldt Interior and Southern Trinity Counties. * WHEN...For the Frost Advisory, from 2 AM to 9 AM PDT Monday. For the Freeze Watch, from late Monday night through Tuesday morning. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. 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. && $$ CAZ107-111-110600- /O.NEW.KEKA.FZ.A.0007.211012T0900Z-211012T1600Z/ Northern Trinity-Northeastern Mendocino Interior- 255 PM PDT Sun Oct 10 2021 ...FREEZE WATCH IN EFFECT FROM LATE MONDAY NIGHT THROUGH TUESDAY MORNING... * WHAT...Sub-freezing temperatures as low as 23 possible. * WHERE...Northern Trinity and Northeastern Mendocino Interior Counties. * WHEN...From late Monday night through Tuesday morning. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
2 follow-up statements
110 WWUS76 KEKA 110447 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 947 PM PDT Sun Oct 10 2021 CAZ106-108-111300- /O.CON.KEKA.FR.Y.0045.211011T0900Z-211011T1600Z/ /O.CON.KEKA.FZ.A.0007.211012T0900Z-211012T1600Z/ Southern Humboldt Interior-Southern Trinity- 947 PM PDT Sun Oct 10 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT MONDAY... ...FREEZE WATCH REMAINS IN EFFECT FROM LATE MONDAY NIGHT THROUGH TUESDAY MORNING... * WHAT...For the Frost Advisory, temperatures as low as 32 will result in frost formation. For the Freeze Watch, sub-freezing temperatures as low as 27 possible. * WHERE...Southern Trinity and Southern Humboldt Interior Counties. * WHEN...For the Frost Advisory, from 2 AM to 9 AM PDT Monday. For the Freeze Watch, from late Monday night through Tuesday morning. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. 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. && $$ CAZ107-111-111300- /O.CON.KEKA.FZ.A.0007.211012T0900Z-211012T1600Z/ Northern Trinity-Northeastern Mendocino Interior- 947 PM PDT Sun Oct 10 2021 ...FREEZE WATCH REMAINS IN EFFECT FROM LATE MONDAY NIGHT THROUGH TUESDAY MORNING... * WHAT...Sub-freezing temperatures as low as 23 possible. * WHERE...Northeastern Mendocino Interior and Northern Trinity Counties. * WHEN...From late Monday night through Tuesday morning. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
021 WWUS76 KEKA 111045 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 345 AM PDT Mon Oct 11 2021 CAZ106-108-112230- /O.CAN.KEKA.FR.Y.0045.000000T0000Z-211011T1600Z/ /O.CON.KEKA.FZ.A.0007.211012T0900Z-211012T1600Z/ Southern Humboldt Interior-Southern Trinity- 345 AM PDT Mon Oct 11 2021 ...FREEZE WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH TUESDAY MORNING... ...FROST ADVISORY IS CANCELLED... * WHAT...Sub-freezing temperatures as low as 27 possible. * WHERE...Southern Trinity and Southern Humboldt Interior Counties. * WHEN...From late tonight through Tuesday morning. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. 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. && $$ CAZ107-111-112230- /O.CON.KEKA.FZ.A.0007.211012T0900Z-211012T1600Z/ Northern Trinity-Northeastern Mendocino Interior- 345 AM PDT Mon Oct 11 2021 ...FREEZE WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH TUESDAY MORNING... * WHAT...Sub-freezing temperatures as low as 23 possible. * WHERE...Northeastern Mendocino Interior and Northern Trinity Counties. * WHEN...From late tonight through Tuesday morning. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 10, 2:30 AM PDT | Gale Warning | EKA | 43 hr | |
| Oct 10, 3:19 AM PDT | Red Flag Warning | EKA | 64 hr | |
| Oct 10, 2:55 PM PDT | Freeze Watch | EKA | Humboldt, Mendocino, Trinity | 23 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.