Alert archive / California / Winter Storm Warnings in 2020
Winter Storm Warning 5, NWS Eureka, CA
NWS Eureka, CA issued this winter storm warning at Dec 24, 2020, 3:11 AM PST for Trinity County, California. It took effect at Dec 25, 2020, 10:00 AM PST. It was in force for 17 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Dec 24, 2020, 3:11 AM PST (11:11 UTC)
- In effect from
- Dec 25, 2020, 10:00 AM PST
- Expired
- Dec 26, 2020, 2:47 AM PST
- In force
- 17 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 11:13 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, 11.2 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
- 2754 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 85 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
910 WWUS46 KEKA 241111 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 311 AM PST Thu Dec 24 2020 ...HEAVY MOUNTAIN SNOW EXPECTED CHRISTMAS DAY ABOVE 3500 FEET... .Light precipitation is forecast to spread across the region late Friday morning and increase in intensity during the afternoon and evening. A cold airmass will favor snow across Trinity County. The heaviest snowfall totals will occur across the Trinity Alps, but snow will also be possible across the eastern valleys around highway pass level. CAZ107-108-241915- /O.UPG.KEKA.WS.A.0005.201225T1800Z-201226T1800Z/ /O.NEW.KEKA.WS.W.0005.201225T1800Z-201226T1800Z/ Northern Trinity-Southern Trinity- 311 AM PST Thu Dec 24 2020 ...WINTER STORM WARNING IN EFFECT FROM 10 AM FRIDAY TO 10 AM PST SATURDAY ABOVE 3500 FEET... * WHAT...Heavy snow expected. Total snow accumulations up to 15 inches at Scott Mountain pass. Three to six inches are possible around Trinity Center at 2500 feet. An inch or less is expected at Weaverville, Douglas City and Hayfork. * WHERE...Northern Trinity and Southern Trinity Counties. * WHEN...From 10 AM Friday to 10 AM PST Saturday. * IMPACTS...Travel could be very difficult to impossible at times. The hazardous conditions will be impacted on highway three at Scott Mountain pass. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state of California can be obtained by calling 1-800-GAS-ROAD. && $$
7 follow-up statements
261 WWUS46 KEKA 241900 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 1100 AM PST Thu Dec 24 2020 ...HEAVY MOUNTAIN SNOW EXPECTED CHRISTMAS DAY ABOVE 3500 FEET... .Light precipitation is forecast to spread across the region late Friday morning and increase in intensity during the afternoon and evening. A cold airmass will favor snow across Trinity County. The heaviest snowfall totals will occur across the Trinity Alps, but snow will also be possible across the eastern valleys around highway pass level. CAZ107-108-250400- /O.CON.KEKA.WS.W.0005.201225T1800Z-201226T1800Z/ Northern Trinity-Southern Trinity- 1100 AM PST Thu Dec 24 2020 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 10 AM FRIDAY TO 10 AM PST SATURDAY ABOVE 3500 FEET... * WHAT...Heavy snow expected. Total snow accumulations up to 15 inches at Scott Mountain pass. Three to six inches are possible around Trinity Center at 2500 feet. An inch or less is expected at Weaverville, Douglas City and Hayfork. * WHERE...Northern Trinity and Southern Trinity Counties. * WHEN...From 10 AM Friday to 10 AM PST Saturday. * IMPACTS...Travel could be very difficult to impossible at times. The hazardous conditions will be impacted on highway three at Scott Mountain pass. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. Prepare for possible power outages. The latest road conditions for the state of California can be obtained by calling 1-800-GAS-ROAD. && $$
174 WWUS46 KEKA 250103 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 503 PM PST Thu Dec 24 2020 ...HEAVY MOUNTAIN SNOW EXPECTED CHRISTMAS DAY ABOVE 2500 FEET... .Precipitation is forecast to spread across the region Friday morning and increase in intensity during the afternoon and evening. A cold airmass will favor snow across Trinity County. The heaviest snowfall totals will occur across the Trinity Alps, but snow will also be possible at highway pass level. CAZ107-108-250915- /O.CON.KEKA.WS.W.0005.201225T1800Z-201226T1800Z/ Northern Trinity-Southern Trinity- 503 PM PST Thu Dec 24 2020 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 10 AM FRIDAY TO 10 AM PST SATURDAY ABOVE 2500 FEET... * WHAT...Heavy snow expected above 2500 feet. Snow accumulations in excess of a foot at Scott Mountain Summit on Highway 3. Six inches at Oregon Mountain and Buckhorn Summit on Highway 299. Three to six inches possible at Trinity Center. Around an inch at Weaverville. * WHERE...Southern Trinity and Northern Trinity Counties. * WHEN...From 10 AM Friday to 10 AM PST Saturday. * IMPACTS...Travel could be very difficult to impossible. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state of California can be obtained by calling 1-800-GAS-ROAD. && $$
122 WWUS46 KEKA 250616 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 1016 PM PST Thu Dec 24 2020 ...HEAVY MOUNTAIN SNOW EXPECTED CHRISTMAS DAY ABOVE 2500 FEET... .Precipitation is forecast to spread across the region Friday morning and increase in intensity during the afternoon and evening. A cold airmass will favor snow across Trinity County. The heaviest snowfall totals will occur across the Trinity Alps, but snow will also be possible at highway pass level. CAZ107-108-251430- /O.CON.KEKA.WS.W.0005.201225T1800Z-201226T1800Z/ Northern Trinity-Southern Trinity- 1016 PM PST Thu Dec 24 2020 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 10 AM FRIDAY TO 10 AM PST SATURDAY ABOVE 2500 FEET... * WHAT...Heavy snow expected above 2500 feet. Snow accumulations in excess of a foot at Scott Mountain Summit on Highway 3. Six inches at Oregon Mountain and Buckhorn Summit on Highway 299. Three to six inches possible at Trinity Center. Around an inch at Weaverville. * WHERE...Southern Trinity and Northern Trinity Counties. * WHEN...From 10 AM Friday to 10 AM PST Saturday. * IMPACTS...Travel could be very difficult to impossible. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state of California can be obtained by calling 1-800-GAS-ROAD. && $$
849 WWUS46 KEKA 251109 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 309 AM PST Fri Dec 25 2020 CAZ108-251215- /O.CAN.KEKA.WS.W.0005.201225T1800Z-201226T1800Z/ Southern Trinity- 309 AM PST Fri Dec 25 2020 ...WINTER STORM WARNING IS CANCELLED... $$ CAZ107-251915- /O.CON.KEKA.WS.W.0005.201225T1800Z-201226T1800Z/ Northern Trinity- 309 AM PST Fri Dec 25 2020 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 10 AM PST SATURDAY ABOVE 2500 FEET... * WHAT...Heavy snow expected above 2500 to 3500 feet. Total snow accumulations of up to 24 inches at Scott Mountain Pass on highway 3. Around 3 inches expected at Buckhorn Summit on Highway 299. 4 to 6 inches expected around Trinity Center. Less than an inch possible elsewhere at elevations around 2500 feet. * WHERE...Northern Trinity County. * WHEN...From 10 AM this morning to 10 AM PST Saturday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the evening commute. Gusty winds could bring down tree branches. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state of California can be obtained by calling 1-800-GAS-ROAD. && $$
220 WWUS46 KEKA 251859 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 1059 AM PST Fri Dec 25 2020 CAZ107-260400- /O.CON.KEKA.WS.W.0005.000000T0000Z-201226T1800Z/ Northern Trinity- 1059 AM PST Fri Dec 25 2020 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST SATURDAY ABOVE 2500 FEET... * WHAT...Heavy snow expected above 2500 to 3500 feet. Total snow accumulations of up to 24 inches at Scott Mountain Pass on highway 3. Around 3 inches expected at Buckhorn Summit on Highway 299. 4 to 6 inches expected around Trinity Center. Around an inch possible elsewhere at elevations around 2500 feet. * WHERE...Northern Trinity County. * WHEN...Until 10 AM PST Saturday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the evening commute. Gusty winds could bring down tree branches. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state of California can be obtained by calling 1-800-GAS-ROAD. && $$
255 WWUS46 KEKA 260345 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 745 PM PST Fri Dec 25 2020 CAZ107-261145- /O.CON.KEKA.WS.W.0005.000000T0000Z-201226T1800Z/ Northern Trinity- 745 PM PST Fri Dec 25 2020 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST SATURDAY ABOVE 2500 FEET... * WHAT...Heavy snow expected above 2500 to 3500 feet. Total snow accumulations of up to 24 inches at Scott Mountain Pass on highway 3. Around 3 inches expected at Buckhorn Summit on Highway 299. * WHERE...Northern Trinity County. * WHEN...Until 10 AM PST Saturday. * IMPACTS...Travel could be very difficult to impossible. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state of California can be obtained by calling 1-800-GAS-ROAD. && $$
751 WWUS46 KEKA 261047 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 247 AM PST Sat Dec 26 2020 CAZ107-261800- /O.CAN.KEKA.WS.W.0005.000000T0000Z-201226T1800Z/ /O.NEW.KEKA.WW.Y.0016.201226T1047Z-201226T1800Z/ Northern Trinity- 247 AM PST Sat Dec 26 2020 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 10 AM PST THIS MORNING ABOVE 3500 FEET... ...WINTER STORM WARNING IS CANCELLED... * WHAT...Additional snow accumulation up to 2 inches expected over Scott Mountain Pass this morning. * WHERE...Northern Trinity County. * WHEN...Until 10 AM PST this morning. * IMPACTS...Travel could be very difficult on highway 3 over Scott Mountain Pass. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state of California can be obtained by calling 1-800-GAS-ROAD. && $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 24, 3:12 AM PST | Wind Advisory | EKA | Del Norte, Humboldt | 39 hr |
Nearby
Winter Storm Warnings in California, 2020Every winter storm warning in 2020
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.