Alert archive / California / Frost Advisories in 2021
Frost Advisory 3, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Mar 2, 2021, 2:37 PM PST for 4 counties in California. It took effect at Mar 3, 2021, 12:00 AM PST. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Mar 2, 2021, 2:37 PM PST (22:37 UTC)
- In effect from
- Mar 3, 2021, 12:00 AM PST
- Expired
- Mar 3, 2021, 9:00 AM PST
- In force
- 9 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 22:35 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, 10.6 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 992 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
483 WWUS76 KEKA 022237 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 237 PM PST Tue Mar 2 2021 CAZ101-103-109>115-031700- /O.NEW.KEKA.FR.Y.0003.210303T0800Z-210303T1700Z/ Coastal Del Norte-Northern Humboldt Coast-Mendocino Coast- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake County-Southern Lake County- 237 PM PST Tue Mar 2 2021 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM WEDNESDAY... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Lake, Mendocino, and coastal Del Norte and Humboldt 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. $$
2 follow-up statements
875 WWUS76 KEKA 030936 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 136 AM PST Wed Mar 3 2021 CAZ101-103-109>115-031700- /O.CON.KEKA.FR.Y.0003.000000T0000Z-210303T1700Z/ Coastal Del Norte-Northern Humboldt Coast-Mendocino Coast- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake County-Southern Lake County- 136 AM PST Wed Mar 3 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING... * WHAT...Temperatures as low as 35 will result in frost formation. * WHERE...Mendocino Coast, Coastal Del Norte, Southeastern Mendocino Interior, Northern Humboldt Coast, Northeastern Mendocino Interior, Northern Lake County, Southern Lake County, Southwestern Mendocino Interior and Northwestern Mendocino Interior Counties. * WHEN...Until 9 AM PST this morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
302 WWUS76 KEKA 031133 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 333 AM PST Wed Mar 3 2021 CAZ101-031945- /O.NEW.KEKA.WI.Y.0009.210305T0000Z-210305T1500Z/ /O.CON.KEKA.FR.Y.0003.000000T0000Z-210303T1700Z/ Coastal Del Norte- 333 AM PST Wed Mar 3 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING... ...WIND ADVISORY IN EFFECT FROM 4 PM THURSDAY TO 7 AM PST FRIDAY... * WHAT...For the Frost Advisory, temperatures as low as 36 will result in frost formation. For the Wind Advisory, south winds 15 to 25 mph with gusts up to 45 mph expected. * WHERE...Coastal Del Norte County. * WHEN...For the Frost Advisory, until 9 AM PST this morning. For the Wind Advisory, from 4 PM Thursday to 7 AM PST Friday. * 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. && $$ CAZ102-104>106-031945- /O.NEW.KEKA.WI.Y.0009.210305T0000Z-210305T1500Z/ Del Norte Interior-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- 333 AM PST Wed Mar 3 2021 ...WIND ADVISORY IN EFFECT FROM 4 PM THURSDAY TO 7 AM PST FRIDAY... * WHAT...South winds 15 to 25 mph with gusts up to 45 mph expected. * WHERE...Del Norte Interior, Southwestern Humboldt, Northern Humboldt Interior and Southern Humboldt Interior Counties. * WHEN...From 4 PM Thursday to 7 AM PST Friday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ CAZ103-109>115-031700- /O.CON.KEKA.FR.Y.0003.000000T0000Z-210303T1700Z/ Northern Humboldt Coast-Mendocino Coast- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake County-Southern Lake County- 333 AM PST Wed Mar 3 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING... * WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...Mendocino Coast, Southeastern Mendocino Interior, Northern Humboldt Coast, Northeastern Mendocino Interior, Northern Lake County, Southwestern Mendocino Interior, Southern Lake County and Northwestern Mendocino Interior Counties. * WHEN...Until 9 AM PST this morning. * 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. && $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 1, 6:34 PM PST | Freeze Warning | EKA | Lake, Mendocino | 14 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.