Alert archive / California / Frost Advisories in 2021
Frost Advisory 41, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Jun 9, 2021, 12:04 PM PDT for Humboldt County, Mendocino County, California. It took effect at Jun 10, 2021, 1:00 AM PDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Jun 9, 2021, 12:04 PM PDT (19:04 UTC)
- In effect from
- Jun 10, 2021, 1:00 AM PDT
- Expired
- Jun 10, 2021, 9:00 AM PDT
- In force
- 8 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 19:04 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, 7.1 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
- 1082 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- -10 m²/s²
- 0-3 km storm-relative helicity
- 121 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
115 WWUS76 KEKA 091904 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1204 PM PDT Wed Jun 9 2021 CAZ108-110-111-114-100315- /O.NEW.KEKA.FZ.W.0019.210610T0900Z-210610T1500Z/ Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Northern Lake- 1204 PM PDT Wed Jun 9 2021 ...FREEZE WARNING IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... * WHAT...Sub-freezing temperatures as low as 31 expected. * WHERE...Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior and Northern Lake Counties. * WHEN...From 2 AM to 8 AM PDT Thursday. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. 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. && $$ CAZ107-113-115-100315- /O.NEW.KEKA.FR.Y.0041.210610T0900Z-210610T1500Z/ Northern Trinity-Southeastern Mendocino Interior-Southern Lake- 1204 PM PDT Wed Jun 9 2021 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Northern Trinity, Southeastern Mendocino Interior and Southern Lake Counties. * WHEN...From 2 AM to 8 AM PDT Thursday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
5 follow-up statements
147 WWUS76 KEKA 091907 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1207 PM PDT Wed Jun 9 2021 CAZ108-110-111-114-100315- /O.EXT.KEKA.FZ.W.0019.210610T0800Z-210610T1600Z/ Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Northern Lake- 1207 PM PDT Wed Jun 9 2021 ...FREEZE WARNING NOW IN EFFECT FROM 1 AM TO 9 AM PDT THURSDAY... * WHAT...Sub-freezing temperatures as low as 31 expected. * WHERE...Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior and Northern Lake Counties. * WHEN...From 1 AM to 9 AM PDT Thursday. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. 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. && $$ CAZ107-113-115-100315- /O.EXT.KEKA.FR.Y.0041.210610T0800Z-210610T1600Z/ Northern Trinity-Southeastern Mendocino Interior-Southern Lake- 1207 PM PDT Wed Jun 9 2021 ...FROST ADVISORY NOW IN EFFECT FROM 1 AM TO 9 AM PDT THURSDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Southeastern Mendocino Interior, Southern Lake and Northern Trinity Counties. * WHEN...From 1 AM to 9 AM PDT Thursday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
170 WWUS76 KEKA 092106 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 206 PM PDT Wed Jun 9 2021 CAZ108-110-111-114-100515- /O.CON.KEKA.FZ.W.0019.210610T0800Z-210610T1600Z/ Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Northern Lake- 206 PM PDT Wed Jun 9 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM 1 AM TO 9 AM PDT THURSDAY... * WHAT...Sub-freezing temperatures as low as 31 expected. * WHERE...Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior and Northern Lake Counties. * WHEN...From 1 AM to 9 AM PDT Thursday. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. 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. && $$ CAZ107-113-115-100515- /O.CON.KEKA.FR.Y.0041.210610T0800Z-210610T1600Z/ Northern Trinity-Southeastern Mendocino Interior-Southern Lake- 206 PM PDT Wed Jun 9 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM PDT THURSDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Southeastern Mendocino Interior, Southern Lake and Northern Trinity Counties. * WHEN...From 1 AM to 9 AM PDT Thursday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$
425 WWUS76 KEKA 100410 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 910 PM PDT Wed Jun 9 2021 CAZ108-110-111-114-101215- /O.CON.KEKA.FZ.W.0019.210610T0800Z-210610T1600Z/ Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Northern Lake- 910 PM PDT Wed Jun 9 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM 1 AM TO 9 AM PDT THURSDAY... * WHAT...Sub-freezing temperatures as low as 31 expected. * WHERE...Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior and Northern Lake Counties. * WHEN...From 1 AM to 9 AM PDT Thursday. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. * ADDITIONAL DETAILS...Temperatures will be coldest in calm, clear valleys. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. 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. && $$ CAZ104-106-101215- /O.EXA.KEKA.FR.Y.0041.210610T0800Z-210610T1600Z/ Southwestern Humboldt-Southern Humboldt Interior- 910 PM PDT Wed Jun 9 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM PDT THURSDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Southwestern Humboldt and Southern Humboldt Interior Counties. * WHEN...From 1 AM to 9 AM PDT Thursday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. * ADDITIONAL DETAILS...Temperatures will be coldest in calm, clear valleys. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ107-113-115-101215- /O.CON.KEKA.FR.Y.0041.210610T0800Z-210610T1600Z/ Northern Trinity-Southeastern Mendocino Interior-Southern Lake- 910 PM PDT Wed Jun 9 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM PDT THURSDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Southeastern Mendocino Interior, Northern Trinity and Southern Lake Counties. * WHEN...From 1 AM to 9 AM PDT Thursday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. * ADDITIONAL DETAILS...Temperatures will be coldest in rural, calm, and clear valleys. 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. && $$
427 WWUS76 KEKA 101201 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 501 AM PDT Thu Jun 10 2021 CAZ108-110-111-114-101600- /O.CON.KEKA.FZ.W.0019.000000T0000Z-210610T1600Z/ Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Northern Lake- 501 AM PDT Thu Jun 10 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Sub-freezing temperatures as low as 31. * WHERE...Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior and Northern Lake Counties. * WHEN...Until 9 AM PDT this morning. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ104-106-107-113-115-101600- /O.CON.KEKA.FR.Y.0041.000000T0000Z-210610T1600Z/ Southwestern Humboldt-Southern Humboldt Interior-Northern Trinity- Southeastern Mendocino Interior-Southern Lake- 501 AM PDT Thu Jun 10 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Temperatures as low as 36 will result in frost formation. * WHERE...Southeastern Mendocino Interior, Southwestern Humboldt, Northern Trinity, Southern Humboldt Interior and Southern Lake 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. && $$
341 WWUS76 KEKA 101545 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 845 AM PDT Thu Jun 10 2021 CAZ108-110-111-114-101645- /O.EXP.KEKA.FZ.W.0019.000000T0000Z-210610T1600Z/ Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Northern Lake- 845 AM PDT Thu Jun 10 2021 ...FREEZE WARNING WILL EXPIRE AT 9 AM PDT THIS MORNING... $$ CAZ104-106-107-113-115-101645- /O.EXP.KEKA.FR.Y.0041.000000T0000Z-210610T1600Z/ Southwestern Humboldt-Southern Humboldt Interior-Northern Trinity- Southeastern Mendocino Interior-Southern Lake- 845 AM PDT Thu Jun 10 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 |
|---|---|---|---|---|
| Jun 9, 8:34 AM PDT | Gale Watch | EKA | 18 hr | |
| Jun 9, 12:04 PM PDT | Freeze Warning | EKA | Lake, Mendocino, Trinity | 21 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.