Alert archive / California / Hard Freeze Warnings in 2021
Hard Freeze Warning 2, NWS Eureka, CA
NWS Eureka, CA issued this hard freeze warning at Mar 15, 2021, 1:38 PM PDT for Lake County, Mendocino County, California. It took effect at Mar 16, 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 15, 2021, 1:38 PM PDT (20:38 UTC)
- In effect from
- Mar 16, 2021, 12:00 AM PDT
- Expired
- Mar 16, 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 20:38 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, 8.6 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
- 838 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- -39 m²/s²
- 0-3 km storm-relative helicity
- -20 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
873 WWUS76 KEKA 152038 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 138 PM PDT Mon Mar 15 2021 CAZ110-111-114-161600- /O.UPG.KEKA.HZ.A.0002.210316T0700Z-210316T1600Z/ /O.NEW.KEKA.HZ.W.0002.210316T0700Z-210316T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County- 138 PM PDT Mon Mar 15 2021 ...HARD FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM TUESDAY... * WHAT...Sub-freezing temperatures as low as 22 expected. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior and Northern Lake counties. * WHEN...From midnight tonight to 9 AM 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 who have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. $$ CAZ101-103-104-112-113-115-161600- /O.UPG.KEKA.FZ.A.0002.210316T0700Z-210316T1600Z/ /O.NEW.KEKA.FZ.W.0010.210316T0700Z-210316T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake County- 138 PM PDT Mon Mar 15 2021 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM TUESDAY... * WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Coastal Del Norte, Northern Humboldt Coast, Southwestern Humboldt, Southwestern Mendocino Interior, Southeastern Mendocino Interior and Southern Lake counties. * WHEN...From midnight tonight to 9 AM Tuesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. $$
4 follow-up statements
843 WWUS76 KEKA 152047 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 147 PM PDT Mon Mar 15 2021 CAZ104-152200- /O.CAN.KEKA.FZ.W.0010.210316T0700Z-210316T1600Z/ Southwestern Humboldt- 147 PM PDT Mon Mar 15 2021 ...FREEZE WARNING IS CANCELLED... The growing season in Southwestern Humboldt County does not begin until April 1st. $$ CAZ110-111-114-161600- /O.CON.KEKA.HZ.W.0002.210316T0700Z-210316T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County- 147 PM PDT Mon Mar 15 2021 ...HARD FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM TUESDAY... * WHAT...Sub-freezing temperatures as low as 22 expected. * WHERE...Northeastern Mendocino Interior, Northern Lake, and Northwestern Mendocino Interior counties. * WHEN...From midnight tonight to 9 AM Tuesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation, and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes, they should be wrapped, drained, or allowed to drip slowly. Those who have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. $$ CAZ101-103-112-113-115-161600- /O.CON.KEKA.FZ.W.0010.210316T0700Z-210316T1600Z/ Coastal Del Norte-Northern Humboldt Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake County- 147 PM PDT Mon Mar 15 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM TUESDAY... * WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Coastal Del Norte, Southeastern Mendocino Interior, Northern Humboldt Coast, Southern Lake, and Southwestern Mendocino Interior counties. * WHEN...From midnight tonight to 9 AM 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. $$
878 WWUS76 KEKA 160200 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 700 PM PDT Mon Mar 15 2021 CAZ109-161000- /O.EXA.KEKA.FZ.W.0010.210316T0700Z-210316T1600Z/ Mendocino Coast- 700 PM PDT Mon Mar 15 2021 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT TUESDAY... * WHAT...Sub-freezing temperatures as low as 30 expected. * WHERE...Mendocino Coast County. * WHEN...From midnight tonight to 9 AM PDT Tuesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing.. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ110-111-114-161000- /O.CON.KEKA.HZ.W.0002.210316T0700Z-210316T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County- 700 PM PDT Mon Mar 15 2021 ...HARD FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT TUESDAY... * WHAT...Sub-freezing temperatures as low as 23 expected. * WHERE...Northeastern Mendocino Interior, Northern Lake County and Northwestern Mendocino Interior Counties. * WHEN...From midnight tonight 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. && $$ CAZ101-103-112-113-115-161000- /O.CON.KEKA.FZ.W.0010.210316T0700Z-210316T1600Z/ Coastal Del Norte-Northern Humboldt Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake County- 700 PM PDT Mon Mar 15 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT TUESDAY... * WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Coastal Del Norte, Southeastern Mendocino Interior, Northern Humboldt Coast, Southern Lake County and Southwestern Mendocino Interior Counties. * WHEN...From midnight tonight to 9 AM PDT Tuesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing.. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
647 WWUS76 KEKA 160926 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 226 AM PDT Tue Mar 16 2021 CAZ110-111-114-161600- /O.CON.KEKA.HZ.W.0002.000000T0000Z-210316T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County- 226 AM PDT Tue Mar 16 2021 ...HARD FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Sub-freezing low temperatures from 23 to 28 expected. * WHERE...Northeastern Mendocino Interior, Northern Lake County and Northwestern Mendocino Interior Counties. * WHEN...From midnight tonight 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. && $$ CAZ101-103-109-112-113-115-161600- /O.CON.KEKA.FZ.W.0010.000000T0000Z-210316T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake County- 226 AM PDT Tue Mar 16 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Sub-freezing temperatures as low as 30 expected. * WHERE...Portions of Coastal Del Norte, Southeastern Mendocino Interior, Northern Humboldt Coast, Southern Lake County and Southwestern Mendocino Interior and Mendocino Coast. * WHEN...From midnight tonight to 9 AM PDT Tuesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing.. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
079 WWUS76 KEKA 161608 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 908 AM PDT Tue Mar 16 2021 CAZ110-111-114-170015- /O.EXP.KEKA.HZ.W.0002.000000T0000Z-210316T1600Z/ /O.NEW.KEKA.FZ.A.0003.210317T0700Z-210317T1600Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake County- 908 AM PDT Tue Mar 16 2021 ...FREEZE WATCH IN EFFECT FROM LATE TONIGHT THROUGH WEDNESDAY MORNING... ...HARD FREEZE WARNING HAS EXPIRED... * WHAT...Sub-freezing temperatures as low as 29 possible. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior and Northern Lake counties. * WHEN...From late tonight through Wednesday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. $$ CAZ101-103-109-112-113-115-161715- /O.EXP.KEKA.FZ.W.0010.000000T0000Z-210316T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake County- 908 AM PDT Tue Mar 16 2021 ...FREEZE WARNING HAS EXPIRED... Widespread frost is likely again tonight. $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 15, 3:21 AM PDT | Freeze Watch | EKA | Del Norte, Humboldt, Mendocino | 10 hr |
| Mar 15, 3:29 AM PDT | Hard Freeze Watch | EKA | Lake, Mendocino | 10 hr |
| Mar 15, 1:38 PM PDT | Freeze Warning | EKA | Del Norte, Humboldt, Mendocino | 19 hr |
Nearby
Hard Freeze Warnings in California, 2021Every hard 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.