Alert archive / California / Freeze Watches in 2021
Freeze Watch 5, NWS Eureka, CA
NWS Eureka, CA issued this freeze watch at May 19, 2021, 4:00 AM PDT for Humboldt County, Trinity County, California. It took effect at May 20, 2021, 1:00 AM PDT. It was in force for .
The area
The counties it named.
The facts
- Issued
- May 19, 2021, 4:00 AM PDT (11:00 UTC)
- In effect from
- May 20, 2021, 1:00 AM PDT
- Expired
- May 19, 2021, 2:35 PM PDT
- In force
- Issued by
- NWS Eureka, CA
Counties Humboldt County, CA, Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 69 km from the middle of the area, began a volume at 11:05 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, 11.0 hours before the alert went out and 197 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
- 2412 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- -61 m²/s²
- 0-3 km storm-relative helicity
- 111 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
803 WWUS76 KEKA 191100 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 400 AM PDT Wed May 19 2021 CAZ111-114-191200- /O.CAN.KEKA.FR.Y.0035.000000T0000Z-210519T1600Z/ Northeastern Mendocino Interior-Northern Lake- 400 AM PDT Wed May 19 2021 ...FROST ADVISORY IS CANCELLED... $$ CAZ106-108-191600- /O.NEW.KEKA.FZ.A.0005.210520T0800Z-210520T1600Z/ /O.CON.KEKA.FR.Y.0035.000000T0000Z-210519T1600Z/ Southern Humboldt Interior-Southern Trinity- 400 AM PDT Wed May 19 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... ...FREEZE WATCH IN EFFECT FROM LATE TONIGHT THROUGH THURSDAY MORNING... * WHAT...For the Frost Advisory, temperatures in the low to mid 30s will result in frost formation. For the Freeze Watch, sub- freezing temperatures in the low 30s and upper 20s possible. * WHERE...Southern Humboldt Interior and Southern Trinity Counties. * WHEN...For the Frost Advisory, until 9 AM PDT this morning. For the Freeze Watch, from late tonight through Thursday morning. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Provide adequate shelter for outdoor pets or consider bringing them indoors. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ102-105-107-110-191600- /O.CON.KEKA.FR.Y.0035.000000T0000Z-210519T1600Z/ Del Norte Interior-Northern Humboldt Interior-Northern Trinity- Northwestern Mendocino Interior- 400 AM PDT Wed May 19 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Temperatures in the low to mid 30s will result in frost formation. * WHERE...Sheltered valleys in the Northwestern Mendocino Interior, Del Norte Interior, Northern Humboldt Interior and Northern Trinity 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. && $$
2 follow-up statements
137 WWUS76 KEKA 191915 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1215 PM PDT Wed May 19 2021 CAZ110-112>115-200315- /O.NEW.KEKA.WI.Y.0010.210520T0100Z-210521T0000Z/ Northwestern Mendocino Interior-Southwestern Mendocino Interior- Southeastern Mendocino Interior-Northern Lake-Southern Lake- 1215 PM PDT Wed May 19 2021 ...WIND ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO 5 PM PDT THURSDAY ABOVE 2000 FEET... * WHAT...Northwest winds 15 to 25 mph with gusts up to 45 mph expected along elevated communities above 2000 feet in elevation. * WHERE...Northwestern Mendocino Interior, Southwestern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...From 6 PM this evening to 5 PM PDT Thursday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ CAZ106-108-200315- /O.CON.KEKA.FZ.A.0005.210520T0800Z-210520T1600Z/ Southern Humboldt Interior-Southern Trinity- 1215 PM PDT Wed May 19 2021 ...FREEZE WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH THURSDAY MORNING... * WHAT...Sub-freezing temperatures as low as 28 possible. * WHERE...Southern Trinity and Southern Humboldt Interior Counties. * WHEN...From late tonight through Thursday morning. * IMPACTS...Frost and freeze conditions could 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. && $$
294 WWUS76 KEKA 192135 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 235 PM PDT Wed May 19 2021 CAZ106-108-200545- /O.UPG.KEKA.FZ.A.0005.210520T0800Z-210520T1600Z/ /O.NEW.KEKA.FR.Y.0036.210520T0800Z-210520T1600Z/ Southern Humboldt Interior-Southern Trinity- 235 PM PDT Wed May 19 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM PDT THURSDAY... * WHAT...Temperatures as low as 30 will result in frost formation. * WHERE...Southern Humboldt Interior and Southern Trinity Counties. * WHEN...From 1 AM to 9 AM PDT Thursday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Frost Advisories and Freeze Warnings are issued during the local growing season as defined by climatology and local agriculture experts. Once the growing season has ended these statements will no longer be issued until the spring. && $$ CAZ110-112>115-200545- /O.CON.KEKA.WI.Y.0010.210520T0100Z-210521T0000Z/ Northwestern Mendocino Interior-Southwestern Mendocino Interior- Southeastern Mendocino Interior-Northern Lake-Southern Lake- 235 PM PDT Wed May 19 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING TO 5 PM PDT THURSDAY ABOVE 2000 FEET... * WHAT...Northwest winds 10 to 20 mph with gusts up to 50 mph expected above 2,000 feet. * WHERE...Southwestern Mendocino Interior, Southeastern Mendocino Interior, Northwestern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...From 6 PM this evening to 5 PM PDT Thursday. * 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. && $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 5:23 PM PDT | Gale Warning | EKA | 27 hr | |
| May 19, 12:15 PM PDT | Wind Advisory | EKA | Lake, Mendocino | 15 hr |
| May 19, 2:35 PM PDT | Frost Advisory | EKA | Del Norte, Humboldt, Lake, Mendocino, Trinity | 18 hr |
Nearby
Freeze Watches in California, 2021Every freeze watch 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.