Alert archive / California / Frost Advisories in 2021
Frost Advisory 29, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Apr 14, 2021, 2:50 PM PDT for 5 counties in California. It took effect at Apr 15, 2021, 1:00 AM PDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Apr 14, 2021, 2:50 PM PDT (21:50 UTC)
- In effect from
- Apr 15, 2021, 1:00 AM PDT
- Expired
- Apr 15, 2021, 9:00 AM PDT
- In force
- 8 hr
- Issued by
- NWS Eureka, CA
Counties Del Norte County, CA, Humboldt County, CA, Lake County, CA, Mendocino County, CA, Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 75 km from the middle of the area, began a volume at 21:54 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, 9.8 hours before the alert went out and 233 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
- 2573 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 49 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
779 WWUS76 KEKA 142150 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 250 PM PDT Wed Apr 14 2021 CAZ103>112-114-115-150600- /O.NEW.KEKA.FR.Y.0029.210415T0800Z-210415T1600Z/ Northern Humboldt Coast-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Northern Trinity-Southern Trinity-Mendocino Coast- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior-Northern Lake-Southern Lake- 250 PM PDT Wed Apr 14 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM PDT THURSDAY... * WHAT...Temperatures as low as 31 will result in frost formation. * WHERE...Portions of northwest California. * WHEN...From 1 AM to 9 AM PDT Thursday. * 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. && $$
3 follow-up statements
019 WWUS76 KEKA 150551 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1051 PM PDT Wed Apr 14 2021 CAZ103>112-114-115-151600- /O.CON.KEKA.FR.Y.0029.210415T0800Z-210415T1600Z/ Northern Humboldt Coast-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Northern Trinity-Southern Trinity-Mendocino Coast- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior-Northern Lake-Southern Lake- 1051 PM PDT Wed Apr 14 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THURSDAY... * WHAT...Temperatures as low as 31 will result in frost formation. * WHERE...Portions of northwest California. * WHEN...From 1 AM to 9 AM PDT Thursday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
624 WWUS76 KEKA 151007 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 307 AM PDT Thu Apr 15 2021 CAZ101-151600- /O.EXA.KEKA.FR.Y.0029.000000T0000Z-210415T1600Z/ Coastal Del Norte- 307 AM PDT Thu Apr 15 2021 ...FROST ADVISORY IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Temperatures as low as 35 will result in frost formation. * WHERE...Coastal Del Norte County. * WHEN...Until 9 AM PDT 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. && $$ CAZ103>112-114-115-151600- /O.CON.KEKA.FR.Y.0029.000000T0000Z-210415T1600Z/ Northern Humboldt Coast-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Northern Trinity-Southern Trinity-Mendocino Coast- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior-Northern Lake-Southern Lake- 307 AM PDT Thu Apr 15 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Portions of northwest California. * WHEN...Until 9 AM PDT this morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
815 WWUS76 KEKA 151551 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 851 AM PDT Thu Apr 15 2021 CAZ101-103>112-114-115-151700- /O.EXP.KEKA.FR.Y.0029.000000T0000Z-210415T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Northern Trinity-Southern Trinity-Mendocino Coast- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior-Northern Lake-Southern Lake- 851 AM PDT Thu Apr 15 2021 ...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 |
|---|---|---|---|---|
| Apr 13, 8:13 PM PDT | Small Craft Advisory | EKA | 10 hr | |
| Apr 14, 5:50 AM PDT | Small Craft Advisory | EKA | 30 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.