Alert archive / California / Frost Advisories in 2021
Frost Advisory 28, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Apr 13, 2021, 2:46 PM PDT for Humboldt County, Mendocino County, California. It took effect at Apr 14, 2021, 3:00 AM PDT. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- Apr 13, 2021, 2:46 PM PDT (21:46 UTC)
- In effect from
- Apr 14, 2021, 3:00 AM PDT
- Expired
- Apr 14, 2021, 9:00 AM PDT
- In force
- 6 hr
- Issued by
- NWS Eureka, CA
Counties Humboldt County, CA, Mendocino County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 71 km from the middle of the area, began a volume at 21:46 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 266 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
- 1758 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
824 WWUS76 KEKA 132146 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 246 PM PDT Tue Apr 13 2021 CAZ106-111-140600- /O.NEW.KEKA.FR.Y.0028.210414T1000Z-210414T1600Z/ Southern Humboldt Interior-Northeastern Mendocino Interior- 246 PM PDT Tue Apr 13 2021 ...FROST ADVISORY IN EFFECT FROM 3 AM TO 9 AM PDT WEDNESDAY... * WHAT...Temperatures as low as 35 will result in frost formation. * WHERE...Southern Humboldt Interior and Northeastern Mendocino Interior Counties. * WHEN...From 3 AM 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. && $$
3 follow-up statements
629 WWUS76 KEKA 140328 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 828 PM PDT Tue Apr 13 2021 CAZ111-140430- /O.CAN.KEKA.FR.Y.0028.210414T1000Z-210414T1600Z/ Northeastern Mendocino Interior- 828 PM PDT Tue Apr 13 2021 ...FROST ADVISORY IS CANCELLED... $$ CAZ106-141130- /O.CON.KEKA.FR.Y.0028.210414T1000Z-210414T1600Z/ Southern Humboldt Interior- 828 PM PDT Tue Apr 13 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 3 AM TO 9 AM PDT WEDNESDAY... * WHAT...Temperatures as low as 35 will result in frost formation. * WHERE...Southern Humboldt Interior County. * WHEN...From 3 AM 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. && $$
747 WWUS76 KEKA 140936 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 236 AM PDT Wed Apr 14 2021 CAZ103-104-110-141600- /O.EXA.KEKA.FR.Y.0028.210414T1000Z-210414T1600Z/ Northern Humboldt Coast-Southwestern Humboldt- Northwestern Mendocino Interior- 236 AM PDT Wed Apr 14 2021 ...FROST ADVISORY IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Northern Humboldt Coast, Southwestern Humboldt and Northwestern Mendocino Interior Counties. * WHEN...Until 9 AM PDT this morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ106-141600- /O.CON.KEKA.FR.Y.0028.210414T1000Z-210414T1600Z/ Southern Humboldt Interior- 236 AM PDT Wed Apr 14 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Southern Humboldt Interior 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. && $$
992 WWUS76 KEKA 141547 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 847 AM PDT Wed Apr 14 2021 CAZ103-104-106-110-141700- /O.EXP.KEKA.FR.Y.0028.000000T0000Z-210414T1600Z/ Northern Humboldt Coast-Southwestern Humboldt- Southern Humboldt Interior-Northwestern Mendocino Interior- 847 AM PDT Wed Apr 14 2021 ...FROST ADVISORY WILL EXPIRE AT 9 AM PDT THIS MORNING... $$
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.