Alert archive / California / Freeze Warnings in 2021
Freeze Warning 11, NWS Eureka, CA
NWS Eureka, CA issued this freeze warning at Mar 16, 2021, 1:27 PM PDT for Lake County, Mendocino County, California. It took effect at Mar 17, 2021, 12:00 AM PDT. It was in force for 9 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
- Mar 16, 2021, 1:27 PM PDT (20:27 UTC)
- In effect from
- Mar 17, 2021, 12:00 AM PDT
- Expired
- Mar 17, 2021, 9:00 AM PDT
- In force
- 9 hr
- Issued by
- NWS Eureka, CA
Counties Lake County, CA, Mendocino County, CA
The radar
The Beale AFB radar (KBBX), 128 km from the middle of the area, began a volume at 20:32 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 12:00Z, 8.5 hours before the alert went out and 188 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
- 1193 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 115 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
528 WWUS76 KEKA 162027 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 127 PM PDT Tue Mar 16 2021 CAZ110-111-114-171600- /O.UPG.KEKA.FZ.A.0003.210317T0700Z-210317T1600Z/ /O.NEW.KEKA.FZ.W.0011.210317T0700Z-210317T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County- 127 PM PDT Tue Mar 16 2021 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM WEDNESDAY... * WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior, and Northern Lake counties. * WHEN...From midnight tonight to 9 AM 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. $$ CAZ101-103-109-112-113-115-171600- /O.NEW.KEKA.FR.Y.0011.210317T0700Z-210317T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake County- 127 PM PDT Tue Mar 16 2021 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM WEDNESDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Coastal Del Norte, Northern Humboldt Coast, Mendocino Coast, Southwestern Mendocino Interior, Southeastern Mendocino Interior, and Southern Lake counties. * WHEN...From midnight tonight to 9 AM Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. $$
3 follow-up statements
838 WWUS76 KEKA 170206 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 706 PM PDT Tue Mar 16 2021 CAZ115-171015- /O.UPG.KEKA.FR.Y.0011.210317T0700Z-210317T1600Z/ /O.EXA.KEKA.FZ.W.0011.210317T0700Z-210317T1600Z/ Southern Lake- 706 PM PDT Tue Mar 16 2021 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT WEDNESDAY... * WHAT...Sub-freezing temperatures as low as 31 expected. * WHERE...Southern Lake County. * WHEN...From midnight tonight to 9 AM PDT Wednesday. * 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. && $$ CAZ110-111-114-171015- /O.CON.KEKA.FZ.W.0011.210317T0700Z-210317T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 706 PM PDT Tue Mar 16 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT WEDNESDAY... * WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Northeastern Mendocino Interior, Northern Lake and Northwestern Mendocino Interior Counties. * WHEN...From midnight tonight to 9 AM PDT Wednesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing.. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ101-103-109-112-113-171015- /O.CON.KEKA.FR.Y.0011.210317T0700Z-210317T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- 706 PM PDT Tue Mar 16 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT WEDNESDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Mendocino Coast, Coastal Del Norte, Southeastern Mendocino Interior, Northern Humboldt Coast and Southwestern Mendocino Interior Counties. * WHEN...From midnight tonight 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. && $$
559 WWUS76 KEKA 170935 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 235 AM PDT Wed Mar 17 2021 CAZ110-111-114-115-171600- /O.CON.KEKA.FZ.W.0011.000000T0000Z-210317T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake-Southern Lake- 235 AM PDT Wed Mar 17 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Northeastern Mendocino Interior, Northern Lake and Northwestern Mendocino Interior. * WHEN...From midnight tonight to 9 AM PDT Wednesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing.. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ101-103-109-112-113-171600- /O.CON.KEKA.FR.Y.0011.000000T0000Z-210317T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- 235 AM PDT Wed Mar 17 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Mendocino Coast, Coastal Del Norte, Southeastern Mendocino Interior, Northern Humboldt Coast and Southwestern Mendocino Interior. * WHEN...From midnight tonight 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. && $$
538 WWUS76 KEKA 171601 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 901 AM PDT Wed Mar 17 2021 CAZ110-111-114-115-171715- /O.EXP.KEKA.FZ.W.0011.000000T0000Z-210317T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake-Southern Lake- 901 AM PDT Wed Mar 17 2021 ...FREEZE WARNING HAS EXPIRED... Warmer temperatures and rain are expected tonight. $$ CAZ101-103-109-112-113-171715- /O.EXP.KEKA.FR.Y.0011.000000T0000Z-210317T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- 901 AM PDT Wed Mar 17 2021 ...FROST ADVISORY HAS EXPIRED... Warmer temperatures and rain are expected tonight. $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 15, 10:44 PM PDT | Small Craft Advisory | EKA | 20 hr | |
| Mar 16, 3:09 AM PDT | Gale Watch | EKA | 11 hr | |
| Mar 16, 9:08 AM PDT | Freeze Watch | EKA | Lake, Mendocino | 4 hr |
| Mar 16, 1:27 PM PDT | Frost Advisory | EKA | Del Norte, Humboldt, Mendocino | 20 hr |
| Mar 16, 1:39 PM PDT | Winter Storm Watch | EKA | 14 hr | |
| Mar 16, 2:25 PM PDT | Gale Warning | EKA | 46 hr | |
| Mar 16, 2:25 PM PDT | Small Craft Advisory | EKA | 36 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.