Alert archive / California / Frost Advisories in 2021
Frost Advisory 48, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Nov 6, 2021, 3:28 AM PDT for Humboldt County, Lake County, Mendocino County, California. It took effect at Nov 7, 2021, 2:00 AM PST. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- Nov 6, 2021, 3:28 AM PDT (10:28 UTC)
- In effect from
- Nov 7, 2021, 2:00 AM PST
- Expired
- Nov 7, 2021, 8:00 AM PST
- In force
- 6 hr
- Issued by
- NWS Eureka, CA
Counties Humboldt County, CA, Lake County, CA, Mendocino County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 115 km from the middle of the area, began a volume at 10:31 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
Oakland, CA (KOAK), launched 00:00Z, 10.5 hours before the alert went out and 246 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
- 1056 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 77 m²/s²
- 0-3 km storm-relative helicity
- 151 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
922 WWUS76 KEKA 061028 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 328 AM PDT Sat Nov 6 2021 CAZ106-110-111-114-061830- /O.UPG.KEKA.FZ.A.0009.211107T1000Z-211107T1600Z/ /O.NEW.KEKA.FR.Y.0048.211107T1000Z-211107T1600Z/ /O.NEW.KEKA.FZ.A.0010.211108T1000Z-211108T1600Z/ Southern Humboldt Interior-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Northern Lake- 328 AM PDT Sat Nov 6 2021 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 8 AM PST SUNDAY BELOW 3000 FEET... ...FREEZE WATCH IN EFFECT FROM LATE SUNDAY NIGHT THROUGH MONDAY MORNING BELOW 3000 FEET... * WHAT...For the Frost Advisory below 3000 feet, temperatures None will result in frost formation. For the Freeze Watch below 3000 feet, sub-freezing temperatures None possible. * WHERE...Southern Humboldt Interior, Northwestern Mendocino Interior, Northeastern Mendocino Interior and Northern Lake Counties. * WHEN...For the Frost Advisory, from 2 AM to 8 AM PST Sunday. For the Freeze Watch, from late Sunday night through Monday morning. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation. * ADDITIONAL DETAILS...Valley fog could help protect some areas from freezing temperatures, particularly on Sunday. 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. && $$
3 follow-up statements
381 WWUS76 KEKA 062041 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 141 PM PDT Sat Nov 6 2021 CAZ106-110-111-114-070445- /O.CON.KEKA.FR.Y.0048.211107T1000Z-211107T1600Z/ /O.CON.KEKA.FZ.A.0010.211108T1000Z-211108T1600Z/ Southern Humboldt Interior-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Northern Lake- 141 PM PDT Sat Nov 6 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 8 AM PST SUNDAY BELOW 3000 FEET... ...FREEZE WATCH REMAINS IN EFFECT FROM LATE SUNDAY NIGHT THROUGH MONDAY MORNING BELOW 3000 FEET... * WHAT...For the Frost Advisory below 3000 feet, temperatures None will result in frost formation. For the Freeze Watch below 3000 feet, sub-freezing temperatures None possible. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Lake and Southern Humboldt Interior Counties. * WHEN...For the Frost Advisory, from 2 AM to 8 AM PST Sunday. For the Freeze Watch, from late Sunday night through Monday morning. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
882 WWUS76 KEKA 070544 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1044 PM PDT Sat Nov 6 2021 CAZ106-110-111-114-071345- /O.CON.KEKA.FR.Y.0048.211107T1000Z-211107T1600Z/ /O.CON.KEKA.FZ.A.0010.211108T1000Z-211108T1600Z/ Southern Humboldt Interior-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Northern Lake- 1044 PM PDT Sat Nov 6 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 8 AM PST SUNDAY BELOW 3000 FEET... ...FREEZE WATCH REMAINS IN EFFECT FROM LATE SUNDAY NIGHT THROUGH MONDAY MORNING BELOW 3000 FEET... * WHAT...For the Frost Advisory below 3000 feet, temperatures None will result in frost formation. For the Freeze Watch below 3000 feet, sub-freezing temperatures None possible. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Lake and Southern Humboldt Interior Counties. * WHEN...For the Frost Advisory, from 2 AM to 8 AM PST Sunday. For the Freeze Watch, from late Sunday night through Monday 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. && $$
228 WWUS76 KEKA 071141 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 341 AM PST Sun Nov 7 2021 CAZ106-110-071945- /O.UPG.KEKA.FZ.A.0010.211108T1000Z-211108T1600Z/ /O.NEW.KEKA.FR.Y.0049.211108T1000Z-211108T1600Z/ /O.NEW.KEKA.WI.Y.0016.211108T2200Z-211109T0600Z/ /O.CON.KEKA.FR.Y.0048.000000T0000Z-211107T1600Z/ Southern Humboldt Interior-Northwestern Mendocino Interior- 341 AM PST Sun Nov 7 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST THIS MORNING... ...FROST ADVISORY IN EFFECT FROM 2 AM TO 8 AM PST MONDAY... ...WIND ADVISORY IN EFFECT FROM 2 PM TO 10 PM PST MONDAY ABOVE 1500 FEET... * WHAT...For the frost advisory, temperatures below 36 will lead to frost formation in clear valleys. For the Wind Advisory above 1500 feet, southeast winds 25 to 35 mph with gusts up to 55 mph expected. * WHERE...Southern Humboldt Interior and Northwestern Mendocino Interior Counties. * WHEN...For the first Frost Advisory, until 8 AM PST this morning. For the second Frost Advisory, from 2 AM to 8 AM PST Monday. For the Wind Advisory, from 2 PM to 10 PM PST Monday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ111-114-071945- /O.UPG.KEKA.FZ.A.0010.211108T1000Z-211108T1600Z/ /O.NEW.KEKA.FR.Y.0049.211108T1000Z-211108T1600Z/ /O.CON.KEKA.FR.Y.0048.000000T0000Z-211107T1600Z/ Northeastern Mendocino Interior-Northern Lake- 341 AM PST Sun Nov 7 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST THIS MORNING... ...FROST ADVISORY IN EFFECT FROM 2 AM TO 8 AM PST MONDAY... * WHAT...For the frost advisory, temperatures below 36 will lead to frost formation in clear valleys. * WHERE...Northeastern Mendocino Interior and Northern Lake Counties. * WHEN...For the first Frost Advisory, until 8 AM PST this morning. For the second Frost Advisory, from 2 AM to 8 AM PST Monday. * 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. && $$ CAZ101-103-104-109-071945- /O.NEW.KEKA.WI.Y.0016.211108T2200Z-211109T0600Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Mendocino Coast- 341 AM PST Sun Nov 7 2021 ...WIND ADVISORY IN EFFECT FROM 2 PM TO 10 PM PST MONDAY... * WHAT...Southeast winds 25 to 35 mph with gusts up to 55 mph expected. * WHERE...Coastal Del Norte, Northern Humboldt Coast, Southwestern Humboldt and Mendocino Coast Counties. * WHEN...From 2 PM to 10 PM PST Monday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ CAZ102-105-071945- /O.NEW.KEKA.WI.Y.0016.211108T2200Z-211109T0600Z/ Del Norte Interior-Northern Humboldt Interior- 341 AM PST Sun Nov 7 2021 ...WIND ADVISORY IN EFFECT FROM 2 PM TO 10 PM PST MONDAY ABOVE 1500 FEET... * WHAT...Southeast winds 25 to 35 mph with gusts up to 60 mph expected above 1500 feet. * WHERE...Del Norte Interior and Northern Humboldt Interior Counties. * WHEN...From 2 PM to 10 PM PST Monday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 6, 2:31 AM PDT | Special Weather Statement | EKA | Humboldt | 44 min |
| Nov 6, 3:01 AM PDT | Gale Watch | EKA | 25 hr | |
| Nov 6, 3:01 AM PDT | Small Craft Advisory | EKA | 23 hr | |
| Nov 6, 3:28 AM PDT | Freeze Watch | EKA | Humboldt, Lake, Mendocino | 25 hr |
| Nov 6, 3:45 AM PDT | Winter Storm Watch | EKA | 25 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.