Alert archive / California / Freeze Warnings in 2021
Freeze Warning 20, NWS Eureka, CA
NWS Eureka, CA issued this freeze warning at Oct 11, 2021, 2:11 PM PDT for 4 counties in California. It took effect at Oct 12, 2021, 2:00 AM PDT. It was in force for 7 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Oct 11, 2021, 2:11 PM PDT (21:11 UTC)
- In effect from
- Oct 12, 2021, 2:00 AM PDT
- Expired
- Oct 12, 2021, 9:00 AM PDT
- In force
- 7 hr
- Issued by
- NWS Eureka, CA
Counties Del Norte County, CA, Humboldt County, CA, Lake County, CA, Mendocino County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 72 km from the middle of the area, began a volume at 21:12 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 244 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
- 24 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 823 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 97 m²/s²
- 0-3 km storm-relative helicity
- 142 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
041 WWUS76 KEKA 112111 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 211 PM PDT Mon Oct 11 2021 CAZ106>108-120515- /O.UPG.KEKA.HZ.A.0003.211012T0900Z-211012T1600Z/ /O.NEW.KEKA.HZ.W.0004.211012T0900Z-211012T1600Z/ Southern Humboldt Interior-Northern Trinity-Southern Trinity- 211 PM PDT Mon Oct 11 2021 ...HARD FREEZE WARNING IN EFFECT FROM 2 AM TO 9 AM PDT TUESDAY... * WHAT...Sub-freezing temperatures as low as 23 expected. * WHERE...Southern Humboldt Interior, Northern Trinity and Southern Trinity Counties. * WHEN...From 2 AM to 9 AM PDT Tuesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. 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. && $$ CAZ111-120515- /O.UPG.KEKA.FZ.A.0007.211012T0900Z-211012T1600Z/ /O.NEW.KEKA.FZ.W.0020.211012T0900Z-211012T1600Z/ Northeastern Mendocino Interior- 211 PM PDT Mon Oct 11 2021 ...FREEZE WARNING IN EFFECT FROM 2 AM TO 9 AM PDT TUESDAY... * WHAT...Sub-freezing temperatures as low as 31 expected. * WHERE...Northeastern Mendocino Interior County. * WHEN...From 2 AM to 9 AM PDT Tuesday. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ102-105-110-114-120515- /O.NEW.KEKA.FZ.W.0020.211012T0900Z-211012T1600Z/ Del Norte Interior-Northern Humboldt Interior- Northwestern Mendocino Interior-Northern Lake- 211 PM PDT Mon Oct 11 2021 ...FREEZE WARNING IN EFFECT FROM 2 AM TO 9 AM PDT TUESDAY... * WHAT...Sub-freezing temperatures as low as 31 expected. * WHERE...Del Norte Interior, Northern Humboldt Interior, Northwestern Mendocino Interior and Northern Lake Counties. * WHEN...From 2 AM to 9 AM PDT Tuesday. * 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. && $$
3 follow-up statements
817 WWUS76 KEKA 120502 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1002 PM PDT Mon Oct 11 2021 CAZ106>108-121315- /O.CON.KEKA.HZ.W.0004.211012T0900Z-211012T1600Z/ Southern Humboldt Interior-Northern Trinity-Southern Trinity- 1002 PM PDT Mon Oct 11 2021 ...HARD FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT TUESDAY... * WHAT...Sub-freezing temperatures as low as 23 expected. * WHERE...Southern Trinity, Northern Trinity and Southern Humboldt Interior Counties. * WHEN...From 2 AM to 9 AM PDT Tuesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ102-105-110-111-114-121315- /O.CON.KEKA.FZ.W.0020.211012T0900Z-211012T1600Z/ Del Norte Interior-Northern Humboldt Interior- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 1002 PM PDT Mon Oct 11 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT TUESDAY... * WHAT...Sub-freezing temperatures as low as 31 expected. * WHERE...Northeastern Mendocino Interior, Northwestern Mendocino Interior, Del Norte Interior, Northern Humboldt Interior and Northern Lake Counties. * WHEN...From 2 AM to 9 AM PDT Tuesday. * 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. && $$
673 WWUS76 KEKA 121056 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 356 AM PDT Tue Oct 12 2021 CAZ106>108-121600- /O.CON.KEKA.HZ.W.0004.000000T0000Z-211012T1600Z/ Southern Humboldt Interior-Northern Trinity-Southern Trinity- 356 AM PDT Tue Oct 12 2021 ...HARD FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Sub-freezing temperatures as low as 23. * WHERE...Southern Trinity, Northern Trinity and Southern Humboldt Interior Counties. * WHEN...Until 9 AM PDT this morning. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ102-105-110-111-114-121600- /O.CON.KEKA.FZ.W.0020.000000T0000Z-211012T1600Z/ Del Norte Interior-Northern Humboldt Interior- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 356 AM PDT Tue Oct 12 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Sub-freezing temperatures as low as 31. * WHERE...Northeastern Mendocino Interior, Northwestern Mendocino Interior, Del Norte Interior, Northern Humboldt Interior and Northern Lake Counties. * WHEN...Until 9 AM PDT this morning. * 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. && $$
335 WWUS76 KEKA 121545 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 845 AM PDT Tue Oct 12 2021 CAZ106>108-121645- /O.EXP.KEKA.HZ.W.0004.000000T0000Z-211012T1600Z/ Southern Humboldt Interior-Northern Trinity-Southern Trinity- 845 AM PDT Tue Oct 12 2021 ...HARD FREEZE WARNING WILL EXPIRE AT 9 AM PDT THIS MORNING... $$ CAZ102-105-110-111-114-121645- /O.EXP.KEKA.FZ.W.0020.000000T0000Z-211012T1600Z/ Del Norte Interior-Northern Humboldt Interior- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 845 AM PDT Tue Oct 12 2021 ...FREEZE WARNING WILL EXPIRE AT 9 AM PDT THIS MORNING... $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 11, 7:58 AM PDT | Hard Freeze Watch | EKA | Humboldt, Trinity | 6 hr |
| Oct 11, 2:06 PM PDT | Hazardous Seas Warning | EKA | 13 hr | |
| Oct 11, 2:11 PM PDT | Hard Freeze Warning | EKA | Humboldt, Trinity | 19 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.