Alert archive / California / Freeze Warnings in 2021
Freeze Warning 23, NWS Eureka, CA
NWS Eureka, CA issued this freeze warning at Nov 23, 2021, 2:30 AM PST for Del Norte County, Humboldt County, California. It took effect at Nov 24, 2021, 2:00 AM PST. It was in force for 65 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Nov 23, 2021, 2:30 AM PST (10:30 UTC)
- In effect from
- Nov 24, 2021, 2:00 AM PST
- Expired
- Nov 24, 2021, 3:05 AM PST
- In force
- 65 min
- Issued by
- NWS Eureka, CA
Counties Del Norte County, CA, Humboldt County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 86 km from the middle of the area, began a volume at 10:34 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, 10.5 hours before the alert went out and 158 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
- 2103 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
039 WWUS76 KEKA 231030 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 230 AM PST Tue Nov 23 2021 CAZ102-105-106-232230- /O.UPG.KEKA.FZ.A.0011.211124T0900Z-211124T1800Z/ /O.NEW.KEKA.FZ.W.0023.211124T1000Z-211124T1700Z/ Del Norte Interior-Northern Humboldt Interior- Southern Humboldt Interior- 230 AM PST Tue Nov 23 2021 ...FREEZE WARNING IN EFFECT FROM 2 AM TO 9 AM PST WEDNESDAY... * WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Del Norte Interior, Northern Humboldt Interior and Southern Humboldt Interior Counties. * WHEN...From 2 AM to 9 AM PST Wednesday. * IMPACTS...Frost and freeze conditions will 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. && $$ CAZ101-103-104-112-113-115-232230- /O.NEW.KEKA.FR.Y.0053.211124T1000Z-211124T1700Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 230 AM PST Tue Nov 23 2021 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 9 AM PST WEDNESDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Coastal Del Norte, Northern Humboldt Coast, Southwestern Humboldt, Southwestern Mendocino Interior, Southeastern Mendocino Interior and Southern Lake Counties. * WHEN...From 2 AM to 9 AM PST Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
3 follow-up statements
575 WWUS76 KEKA 232221 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 221 PM PST Tue Nov 23 2021 CAZ103-240630- /O.EXA.KEKA.FZ.W.0023.211124T1000Z-211124T1700Z/ /O.CON.KEKA.FR.Y.0053.211124T1000Z-211124T1700Z/ Northern Humboldt Coast- 221 PM PST Tue Nov 23 2021 ...FREEZE WARNING IN EFFECT FROM 2 AM TO 9 AM PST WEDNESDAY... * WHAT...For the Freeze Warning, sub-freezing temperatures as low as 32 expected. * WHERE...Northern Humboldt Coast County. * WHEN...From 2 AM to 9 AM PST Wednesday. * IMPACTS...Frost and freeze conditions will 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. && $$ CAZ102-105-106-240630- /O.EXA.KEKA.FR.Y.0053.211124T1000Z-211124T1700Z/ /O.CON.KEKA.FZ.W.0023.211124T1000Z-211124T1700Z/ Del Norte Interior-Northern Humboldt Interior- Southern Humboldt Interior- 221 PM PST Tue Nov 23 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 9 AM PST WEDNESDAY... * WHAT...For the Freeze Warning, sub-freezing temperatures as low as 29 expected. * WHERE...Del Norte Interior, Northern Humboldt Interior and Southern Humboldt Interior Counties. * WHEN...From 2 AM to 9 AM PST Wednesday. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ109-240630- /O.EXA.KEKA.FR.Y.0053.211124T1000Z-211124T1700Z/ Mendocino Coast- 221 PM PST Tue Nov 23 2021 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 9 AM PST WEDNESDAY... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Mendocino Coast County. * WHEN...From 2 AM to 9 AM PST 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. && $$ CAZ101-104-112-113-115-240630- /O.CON.KEKA.FR.Y.0053.211124T1000Z-211124T1700Z/ Coastal Del Norte-Southwestern Humboldt- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 221 PM PST Tue Nov 23 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 9 AM PST WEDNESDAY... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Coastal Del Norte, Southeastern Mendocino Interior, Southwestern Humboldt, Southwestern Mendocino Interior and Southern Lake Counties. * WHEN...From 2 AM to 9 AM PST Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
815 WWUS76 KEKA 240620 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1020 PM PST Tue Nov 23 2021 CAZ102-103-105-106-241700- /O.CON.KEKA.FZ.W.0023.211124T1000Z-211124T1700Z/ /O.CON.KEKA.FR.Y.0053.211124T1000Z-211124T1700Z/ Del Norte Interior-Northern Humboldt Coast- Northern Humboldt Interior-Southern Humboldt Interior- 1020 PM PST Tue Nov 23 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 9 AM PST WEDNESDAY... * WHAT...For the Freeze Warning, sub-freezing temperatures as low as 32 expected. * WHERE...Northern Humboldt Coast County. * WHEN...From 2 AM to 9 AM PST Wednesday. * IMPACTS...Frost and freeze conditions will 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. $$ CAZ101-104-109-112-113-115-241700- /O.CON.KEKA.FR.Y.0053.211124T1000Z-211124T1700Z/ Coastal Del Norte-Southwestern Humboldt-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 1020 PM PST Tue Nov 23 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 9 AM WEDNESDAY... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Mendocino Coast County. * WHEN...From 2 AM to 9 AM Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. $$
821 WWUS76 KEKA 241105 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 305 AM PST Wed Nov 24 2021 CAZ102-103-105-106-241700- /O.CAN.KEKA.FZ.W.0023.000000T0000Z-211124T1700Z/ /O.CON.KEKA.FR.Y.0053.000000T0000Z-211124T1700Z/ Del Norte Interior-Northern Humboldt Coast- Northern Humboldt Interior-Southern Humboldt Interior- 305 AM PST Wed Nov 24 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING... ...FREEZE WARNING IS CANCELLED... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Northern Humboldt Coast, Del Norte Interior, Northern Humboldt Interior and Southern Humboldt Interior Counties. * WHEN...Until 9 AM PST 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. && $$ CAZ101-104-109-112-113-115-241700- /O.CON.KEKA.FR.Y.0053.000000T0000Z-211124T1700Z/ Coastal Del Norte-Southwestern Humboldt-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 305 AM PST Wed Nov 24 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Mendocino Coast, Coastal Del Norte, Southeastern Mendocino Interior, Southwestern Humboldt, Southwestern Mendocino Interior and Southern Lake Counties. * WHEN...Until 9 AM PST this morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 23, 2:30 AM PST | Frost Advisory | EKA | Del Norte, Humboldt, Mendocino | 31 hr |
Nearby
Freeze Warnings in California, 2021Every freeze warning 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.