Alert archive / California / Frost Advisories in 2025
Frost Advisory 13, NWS Eureka, CA
NWS Eureka, CA issued this frost advisory at Apr 20, 2025, 2:28 AM PDT for Trinity County, California. It took effect at Apr 21, 2025, 4:00 AM PDT. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- Apr 20, 2025, 2:28 AM PDT (09:28 UTC)
- In effect from
- Apr 21, 2025, 4:00 AM PDT
- Expired
- Apr 21, 2025, 8:00 AM PDT
- In force
- 4 hr
- Issued by
- NWS Eureka, CA
County Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 101 km from the middle of the area, began a volume at 09:26 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, 9.5 hours before the alert went out and 193 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
- 2267 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 40 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
149 WWUS76 KEKA 200928 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 228 AM PDT Sun Apr 20 2025 CAZ107-108-202100- /O.NEW.KEKA.FR.Y.0013.250421T0900Z-250421T1600Z/ Northern Trinity-Southern Trinity- Including Weaverville, Peanut, Forest Glen, and Hayfork 228 AM PDT Sun Apr 20 2025 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 9 AM PDT MONDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Trinity County. * WHEN...From 2 AM to 9 AM PDT Monday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For hazard areas see https://www.wrh.noaa.gov/map/?wfo=eka JJW
3 follow-up statements
262 WWUS76 KEKA 202032 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 132 PM PDT Sun Apr 20 2025 CAZ107-108-211115- /O.EXT.KEKA.FR.Y.0013.250421T1100Z-250421T1500Z/ Northern Trinity-Southern Trinity- Including Forest Glen, Hayfork, Weaverville, and Peanut 132 PM PDT Sun Apr 20 2025 ...FROST ADVISORY NOW IN EFFECT FROM 4 AM TO 8 AM PDT MONDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Trinity County. * WHEN...From 4 AM to 8 AM PDT Monday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For hazard areas see https://www.wrh.noaa.gov/map/?wfo=eka DB
232 WWUS76 KEKA 211003 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 303 AM PDT Mon Apr 21 2025 CAZ107-108-211500- /O.CON.KEKA.FR.Y.0013.250421T1100Z-250421T1500Z/ Northern Trinity-Southern Trinity- Including Weaverville, Forest Glen, Hayfork, and Peanut 303 AM PDT Mon Apr 21 2025 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PDT THIS MORNING... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Trinity County. * WHEN...Until 8 AM PDT this morning. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For hazard areas see https://www.wrh.noaa.gov/map/?wfo=eka EYS
788 WWUS76 KEKA 211451 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 751 AM PDT Mon Apr 21 2025 CAZ107-108-211600- /O.EXP.KEKA.FR.Y.0013.000000T0000Z-250421T1500Z/ Northern Trinity-Southern Trinity- Including Forest Glen, Weaverville, Hayfork, and Peanut 751 AM PDT Mon Apr 21 2025 ...FROST ADVISORY WILL EXPIRE AT 8 AM PDT THIS MORNING... $$ For hazard areas see https://www.wrh.noaa.gov/map/?wfo=eka MKK
Nearby
Frost Advisories in California, 2025Every frost advisory in 2025
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.