Alert archive / California / Frost Advisories in 2020
Frost Advisory 9, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Mar 15, 2020, 4:31 AM PDT for Del Norte County, Humboldt County, Mendocino County, California. It took effect at Mar 16, 2020, 1:00 AM PDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Mar 15, 2020, 4:31 AM PDT (11:31 UTC)
- In effect from
- Mar 16, 2020, 1:00 AM PDT
- Expired
- Mar 16, 2020, 9:00 AM PDT
- In force
- 8 hr
- Issued by
- NWS Eureka, CA
Counties Del Norte County, CA, Humboldt County, CA, Mendocino County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 47 km from the middle of the area, began a volume at 11:32 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
Medford/Jackson, OR (KMFR), launched 00:00Z, 11.5 hours before the alert went out and 210 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
- 35 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 1212 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- -8 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.1
The text
As transmitted.
757 WWUS76 KEKA 151131 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 431 AM PDT Sun Mar 15 2020 CAZ101-103-152000- /O.NEW.KEKA.FR.Y.0009.200316T0800Z-200316T1600Z/ Coastal Del Norte-Northern Humboldt Coast- 431 AM PDT Sun Mar 15 2020 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM PDT MONDAY... * WHAT...Low temperatures in the low to mid 30s will result in frost formation. * WHERE...Coastal Del Norte County and Northern Coastal Humboldt County. * WHEN...From 1 AM to 9 AM PDT Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
3 follow-up statements
452 WWUS76 KEKA 151945 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1245 PM PDT Sun Mar 15 2020 CAZ101-103-160415- /O.CON.KEKA.FR.Y.0009.200316T0800Z-200316T1600Z/ Coastal Del Norte-Northern Humboldt Coast- 1245 PM PDT Sun Mar 15 2020 ...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM PDT MONDAY... * WHAT...Low temperatures in the low to mid 30s will result in frost formation. * WHERE...Coastal Del Norte County and Northern Coastal Humboldt County. * WHEN...From 1 AM to 9 AM PDT Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
183 WWUS76 KEKA 160433 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 933 PM PDT Sun Mar 15 2020 CAZ115-161600- /O.NEW.KEKA.FZ.W.0004.200316T0800Z-200316T1600Z/ /O.NEW.KEKA.HZ.W.0002.200316T0800Z-200316T1600Z/ /O.EXA.KEKA.FR.Y.0009.200316T0800Z-200316T1600Z/ Southern Lake County- 933 PM PDT Sun Mar 15 2020 ...HARD FREEZE WARNING IN EFFECT FROM 1 AM TO 9 AM MONDAY... ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM MONDAY... * WHAT...For the Hard Freeze Warning, sub-freezing temperatures as low as 25 expected. For the Frost Advisory, temperatures as low as 33 will result in frost formation. * WHERE...Southern Lake County County. * WHEN...From 1 AM to 9 AM Monday. * 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. $$ CAZ110-114-161600- /O.NEW.KEKA.FZ.W.0004.200316T0800Z-200316T1600Z/ /O.NEW.KEKA.HZ.W.0002.200316T0800Z-200316T1600Z/ Northwestern Mendocino Interior-Northern Lake County- 933 PM PDT Sun Mar 15 2020 ...FREEZE WARNING IN EFFECT FROM 1 AM TO 9 AM MONDAY... ...HARD FREEZE WARNING IN EFFECT FROM 1 AM TO 9 AM MONDAY... * WHAT...For the Hard Freeze Warning, sub-freezing temperatures as low as 26 expected. For the Freeze Warning, sub-freezing temperatures as low as 30 expected. * WHERE...Northwestern Mendocino Interior and Northern Lake County Counties. * WHEN...From 1 AM to 9 AM Monday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. $$ CAZ113-161600- /O.NEW.KEKA.FZ.W.0004.200316T0800Z-200316T1600Z/ /O.EXA.KEKA.FR.Y.0009.200316T0800Z-200316T1600Z/ Southeastern Mendocino Interior- 933 PM PDT Sun Mar 15 2020 ...FREEZE WARNING IN EFFECT FROM 1 AM TO 9 AM MONDAY... ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM MONDAY... * WHAT...For the Freeze Warning, sub-freezing temperatures as low as 31 expected. For the Frost Advisory, temperatures as low as 33 will result in frost formation. * WHERE...Southeastern Mendocino Interior County. * WHEN...From 1 AM to 9 AM Monday. * 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. $$ CAZ111-161600- /O.NEW.KEKA.HZ.W.0002.200316T0800Z-200316T1600Z/ Northeastern Mendocino Interior- 933 PM PDT Sun Mar 15 2020 ...HARD FREEZE WARNING IN EFFECT FROM 1 AM TO 9 AM MONDAY... * WHAT...Sub-freezing temperatures as low as 24 expected. * WHERE...Northeastern Mendocino Interior County. * WHEN...From 1 AM to 9 AM Monday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. $$ CAZ109-112-161600- /O.EXA.KEKA.FR.Y.0009.200316T0800Z-200316T1600Z/ Mendocino Coast-Southwestern Mendocino Interior- 933 PM PDT Sun Mar 15 2020 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM MONDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Mendocino Coast and Southwestern Mendocino Interior Counties. * WHEN...From 1 AM to 9 AM Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. $$ CAZ101-103-161600- /O.CON.KEKA.FR.Y.0009.200316T0800Z-200316T1600Z/ Coastal Del Norte-Northern Humboldt Coast- 933 PM PDT Sun Mar 15 2020 ...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM MONDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Coastal Del Norte and Northern Humboldt Coast Counties. * WHEN...From 1 AM to 9 AM Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. $$
002 WWUS76 KEKA 161554 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 854 AM PDT Mon Mar 16 2020 CAZ115-161700- /O.EXP.KEKA.FZ.W.0004.000000T0000Z-200316T1600Z/ /O.EXP.KEKA.HZ.W.0002.000000T0000Z-200316T1600Z/ /O.EXP.KEKA.FR.Y.0009.000000T0000Z-200316T1600Z/ Southern Lake County- 854 AM PDT Mon Mar 16 2020 ...FREEZE WARNING WILL EXPIRE AT 9 AM PDT THIS MORNING... ...HARD FREEZE WARNING WILL EXPIRE AT 9 AM PDT THIS MORNING... ...FROST ADVISORY WILL EXPIRE AT 9 AM PDT THIS MORNING... $$ CAZ110-114-161700- /O.EXP.KEKA.FZ.W.0004.000000T0000Z-200316T1600Z/ /O.EXP.KEKA.HZ.W.0002.000000T0000Z-200316T1600Z/ Northwestern Mendocino Interior-Northern Lake County- 854 AM PDT Mon Mar 16 2020 ...FREEZE WARNING WILL EXPIRE AT 9 AM PDT THIS MORNING... ...HARD FREEZE WARNING WILL EXPIRE AT 9 AM PDT THIS MORNING... $$ CAZ113-161700- /O.EXP.KEKA.FZ.W.0004.000000T0000Z-200316T1600Z/ /O.EXP.KEKA.FR.Y.0009.000000T0000Z-200316T1600Z/ Southeastern Mendocino Interior- 854 AM PDT Mon Mar 16 2020 ...FREEZE WARNING WILL EXPIRE AT 9 AM PDT THIS MORNING... ...FROST ADVISORY WILL EXPIRE AT 9 AM PDT THIS MORNING... $$ CAZ111-161700- /O.EXP.KEKA.HZ.W.0002.000000T0000Z-200316T1600Z/ Northeastern Mendocino Interior- 854 AM PDT Mon Mar 16 2020 ...HARD FREEZE WARNING WILL EXPIRE AT 9 AM PDT THIS MORNING... $$ CAZ101-103-109-112-161700- /O.EXP.KEKA.FR.Y.0009.000000T0000Z-200316T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Mendocino Coast- Southwestern Mendocino Interior- 854 AM PDT Mon Mar 16 2020 ...FROST ADVISORY 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 |
|---|---|---|---|---|
| Mar 15, 11:06 AM PDT | Winter Weather Advisory | EKA | Lake, Mendocino | 4 hr |
Nearby
Frost Advisories in California, 2020Every frost advisory in 2020
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.