Alert archive / California / Winter Storm Warnings in 2020
Winter Storm Warning 4, NWS Eureka, CA
NWS Eureka, CA issued this winter storm warning at Apr 3, 2020, 2:22 PM PDT for Trinity County, California. It took effect at Apr 4, 2020, 5:00 AM PDT. It was in force for 45 hr. 6 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Apr 3, 2020, 2:22 PM PDT (21:22 UTC)
- In effect from
- Apr 4, 2020, 5:00 AM PDT
- Expired
- Apr 6, 2020, 2:00 AM PDT
- In force
- 45 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 21:21 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 4, 11:50 AM PDT | SNOW 1 | 1 Sw Trinity Center, CA | SNOW BEGAN AROUND 0700 AND ACCUMULATING. SNOW IS INCREASING IN INTENSITY. SPOTTER OBSERVED ACCUMULATION ON ROADWAYS, BEGINNING AROUND 1030. |
| Apr 4, 12:30 PM PDT | SNOW 0.8 | Lewiston, CA | SOCIAL MEDIA REPORT OF LESS THAN AN INCH OF SNOW FELL FROM 11 A.M. TO 12:30 P.M. IN LEWISTON AT AN ELEVATION OF 2,300 FEET. |
| Apr 4, 1:10 PM PDT | SNOW 2 | 1 Nne Carrville, CA | SOCIAL MEDIA REPORT OF 2 INCHES FELL FROM 9:30 A.M. TO 1:10 P.M. AT AN ELEVATION BETWEEN 2,500 TO 2,800 FEET NEAR COFFEE CREEK. |
| Apr 4, 2:12 PM PDT | SNOW 3 | 19 Ne Covelo, CA | SOCIAL MEDIA REPORT OF 3 INCHES OF SNOW FROM 8:30 A.M. TO 2 P.M. AT AN ELEVATION OF 2,200 FEET. |
| Apr 4, 3:30 PM PDT | SNOW 2 | 1 S Trinity Center, CA | BEGUN AT 8 AM PDT. |
| Apr 5, 11:25 PM PDT | SNOW 2 | 1 Sw Trinity Center, CA | TWO INCHES OF FRESH SNOW ON THE SNOWBOARD THAT FELL IN THE EVENING. ELEVATION IS 2500 FEET. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Medford/Jackson, OR (KMFR), launched 12:00Z, 9.4 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
- 783 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 139 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
709 WWUS46 KEKA 032122 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 222 PM PDT Fri Apr 3 2020 CAZ107-040530- /O.UPG.KEKA.WS.A.0004.200404T1200Z-200405T1200Z/ /O.NEW.KEKA.WS.W.0004.200404T1200Z-200406T0600Z/ Northern Trinity- 222 PM PDT Fri Apr 3 2020 ...WINTER STORM WARNING IN EFFECT FROM 5 AM SATURDAY TO 11 PM PDT SUNDAY ABOVE 3500 FEET... * WHAT...Heavy snow accumulations in excess of 7 inches expected above 3500 feet. * WHERE...Northern Trinity County. * WHEN...From 5 AM Saturday to 11 PM PDT Sunday. * IMPACTS...Road conditions will be hazardous at Scott Mountain Summit on Highway 3. 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. && $$
11 follow-up statements
994 WWUS46 KEKA 040517 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 1017 PM PDT Fri Apr 3 2020 CAZ107-041200- /O.CON.KEKA.WS.W.0004.200404T1200Z-200406T0600Z/ Northern Trinity- 1017 PM PDT Fri Apr 3 2020 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 5 AM SATURDAY TO 11 PM PDT SUNDAY ABOVE 3500 FEET... * WHAT...Heavy snow accumulations in excess of 7 inches expected above 3500 feet. * WHERE...Northern Trinity County. * WHEN...From 5 AM Saturday to 11 PM PDT Sunday. * IMPACTS...Road conditions will be hazardous at Scott Mountain Summit on Highway 3. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. Prepare for possible power outages. The latest road conditions for the state of California can be obtained by calling 1-800-GAS-ROAD. && $$
925 WWUS46 KEKA 041113 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 413 AM PDT Sat Apr 4 2020 ...Snow levels will fluctuate as two systems move through the area... .Cold air in northern Trinity county will keep snow levels around 3,000 to 3,5000 feet this morning. They will rise to around 4,000 feet this afternoon and evening. Sunday afternoon they will fall to around 3,500 feet once again. CAZ107-041915- /O.CON.KEKA.WS.W.0004.200404T1200Z-200406T0600Z/ Northern Trinity- 413 AM PDT Sat Apr 4 2020 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM PDT SUNDAY ABOVE 3500 FEET... * WHAT...Heavy snow is expected mainly above 3500 feet. Snow accumulations of 10 to 20 inches are possible above 4,500 feet with amounts of 7 to 10 inches above 3,500 feet. Local amounts 1 to 3 inches are possible as low as 2,500 feet this morning. * WHERE...Northern Trinity County. * WHEN...Until 11 PM PDT Sunday. * IMPACTS...Road conditions will be hazardous on highway 3 north of Weaverville with the biggest impacts at Scott Mountain Summit. 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. && $$
873 WWUS46 KEKA 041750 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 1050 AM PDT Sat Apr 4 2020 CAZ107-050200- /O.CON.KEKA.WS.W.0004.000000T0000Z-200406T0600Z/ Northern Trinity- 1050 AM PDT Sat Apr 4 2020 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM PDT SUNDAY ABOVE 3000 FEET... * WHAT...Heavy snow is expected for elevations above 3000 feet. Snow accumulations near 5 inches at 3000 feet, ranging to over a foot for elevations above 3500 feet. * WHERE...Northern Trinity County, including Oregon Mountain on Highway 299, and Scott Mountain Summit on Highway 3. * WHEN...Until 11 PM PDT Sunday. * IMPACTS...Road conditions will be hazardous on highway 3 north of Weaverville with the biggest impacts at Scott Mountain Summit. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. Prepare for possible power outages. The latest road conditions for the state of California can be obtained by calling 1-800-GAS-ROAD. && $$
641 WWUS46 KEKA 041830 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 1130 AM PDT Sat Apr 4 2020 CAZ108-050230- /O.EXA.KEKA.WS.W.0004.000000T0000Z-200406T0600Z/ Southern Trinity- 1130 AM PDT Sat Apr 4 2020 ...WINTER STORM WARNING IN EFFECT UNTIL 11 PM PDT SUNDAY ABOVE 3000 FEET... * WHAT...Heavy snow accumulations near 7 inches above 3000 feet. * WHERE...Southern Trinity County, including portions of Highway 36. * WHEN...Until 11 PM PDT Sunday. * IMPACTS...Road conditions will be hazardous on highway 3 north of Weaverville with the biggest impacts at Scott Mountain Summit. 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. && $$ CAZ107-050230- /O.CON.KEKA.WS.W.0004.000000T0000Z-200406T0600Z/ Northern Trinity- 1130 AM PDT Sat Apr 4 2020 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM PDT SUNDAY ABOVE 3000 FEET... * WHAT...Heavy snow is expected for elevations above 3000 feet. Snow accumulations near 5 inches at 3000 feet, ranging to over a foot for elevations above 3500 feet. * WHERE...Northern Trinity County, including Oregon Mountain on Highway 299, and Scott Mountain Summit on Highway 3. * WHEN...Until 11 PM PDT Sunday. * IMPACTS...Road conditions will be hazardous on highway 3 north of Weaverville with the biggest impacts at Scott Mountain Summit. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. Prepare for possible power outages. The latest road conditions for the state of California can be obtained by calling 1-800-GAS-ROAD. && $$
768 WWUS46 KEKA 042118 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 218 PM PDT Sat Apr 4 2020 CAZ107-108-050530- /O.CON.KEKA.WS.W.0004.000000T0000Z-200406T0600Z/ Northern Trinity-Southern Trinity- 218 PM PDT Sat Apr 4 2020 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM PDT SUNDAY ABOVE 3000 FEET... * WHAT...Heavy snow accumulations near 5 inches for elevations near 3000 feet, and in excess of a foot for elevations above 4000 feet. * WHERE...Elevations above 3000 feet in Trinity County. Highway passes impacted include Scott Mountain Summit on highway 3, Oregon Mountain on highway 299, and portions of highways 36 and 3 in southern Trinity County. * WHEN...Until 11 PM PDT Sunday. * IMPACTS...Road conditions will be hazardous. Travel may be impossible at Scott Mountain Summit on highway 3. 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. && $$
107 WWUS46 KEKA 050512 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 1012 PM PDT Sat Apr 4 2020 CAZ107-108-051200- /O.CON.KEKA.WS.W.0004.000000T0000Z-200406T0600Z/ Northern Trinity-Southern Trinity- 1012 PM PDT Sat Apr 4 2020 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM PDT SUNDAY ABOVE 3000 FEET... * WHAT...Heavy snow accumulations near 5 inches for elevations near 3,000 feet, and in excess of a foot for elevations above 4,000 feet. * WHERE...Elevations above 3,000 feet in Trinity County. Highway passes impacted include Scott Mountain Summit on Highway 3, Oregon Mountain on Highway 299, and portions of Highways 36 and 3 in southern Trinity County. * WHEN...Until 11 PM PDT Sunday. * IMPACTS...Road conditions will be hazardous. Travel may be impossible at Scott Mountain Summit on highway 3. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. Prepare for possible power outages. The latest road conditions for the state of California can be obtained by calling 1-800-GAS-ROAD. && $$
572 WWUS46 KEKA 051107 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 407 AM PDT Sun Apr 5 2020 ...Snow continues at higher elevations... .Snow levels are currently 3,500 to 4,000 feet in Trinity county. Heavy snow is expected this morning. Showers will continue this afternoon and tonight. Snow levels will gradually fall to 2,500 feet late tonight, but most accumulating snow will be above 3,500 feet. CAZ107-108-051915- /O.CON.KEKA.WS.W.0004.000000T0000Z-200406T0600Z/ Northern Trinity-Southern Trinity- 407 AM PDT Sun Apr 5 2020 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING ABOVE 3500 FEET... * WHAT...Heavy snow accumulations of 6 to 12 inches above 4,000 feet today and 3 to 7 inches for elevations near 3,500 feet as snow levels fall this afternoon. * WHERE...Trinity county above 4,000 feet today falling to 3,500 feet late this afternoon and evening. This will impact highway 3 at Scott mountain summit and hwy 36 at south fork mountain and east of Hwy 3. * WHEN...Until 11 PM PDT this evening. * IMPACTS...Road conditions will be hazardous. Travel may be impossible at Scott Mountain Summit on highway 3. 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. && $$
117 WWUS46 KEKA 051723 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 1023 AM PDT Sun Apr 5 2020 CAZ107-108-060130- /O.CON.KEKA.WS.W.0004.000000T0000Z-200406T0600Z/ Northern Trinity-Southern Trinity- 1023 AM PDT Sun Apr 5 2020 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING ABOVE 3500 FEET... * WHAT...Heavy snow accumulations of 6 to 12 inches above 4000 feet today and 3 to 7 inches for elevations near 3500 feet. * WHERE...Trinity county above 3500 4000 feet. Travel will be hazardous at Scott Mountain Summit on highway 3 in northern Trinity County, and along portions of highway 36 and highway 3 in southern Trinity County. * WHEN...Until 11 PM PDT this evening. * IMPACTS...Road conditions will be hazardous. Travel may be impossible at Scott Mountain Summit on highway 3. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. Prepare for possible power outages. The latest road conditions for the state of California can be obtained by calling 1-800-GAS-ROAD. && $$
142 WWUS46 KEKA 052111 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 211 PM PDT Sun Apr 5 2020 CAZ108-052215- /O.CAN.KEKA.WS.W.0004.000000T0000Z-200406T0600Z/ Southern Trinity- 211 PM PDT Sun Apr 5 2020 ...WINTER STORM WARNING IS CANCELLED... $$ CAZ107-060515- /O.CON.KEKA.WS.W.0004.000000T0000Z-200406T0600Z/ Northern Trinity- 211 PM PDT Sun Apr 5 2020 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING ABOVE 3500 FEET... * WHAT...Heavy snow accumulations of 6 to 12 inches above 4500 feet, and 3 to 7 inches for elevations near 3500 feet. * WHERE...Trinity County above 3500 feet. Travel will be hazardous at Scott Mountain Summit on highway 3 in northern Trinity County. * WHEN...Until 11 PM PDT this evening. * IMPACTS...Road conditions will be hazardous. Travel may be impossible at Scott Mountain Summit on highway 3. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. Prepare for possible power outages. The latest road conditions for the state of California can be obtained by calling 1-800-GAS-ROAD. && $$
561 WWUS46 KEKA 060513 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 1013 PM PDT Sun Apr 5 2020 CAZ107-060900- /O.EXT.KEKA.WS.W.0004.000000T0000Z-200406T0900Z/ Northern Trinity- 1013 PM PDT Sun Apr 5 2020 ...WINTER STORM WARNING NOW IN EFFECT UNTIL 2 AM PDT MONDAY ABOVE 3500 FEET... * WHAT...Additional snow accumulations of 2 to 4 inches are possible above 3500 feet, with light snow accumulations as low as 2500 feet as well. * WHERE...Primarily across northeastern Trinity County, with heaviest accumulations above 3500 feet. Travel will be hazardous at Scott Mountain Summit and many other areas along Highway 3 in northern Trinity County. * WHEN...Until 2 AM PDT Monday. * IMPACTS...Road conditions will be hazardous. Travel may be impossible along Highway 3, particularly near Scott Mountain Summit. 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. && $$
172 WWUS46 KEKA 060905 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 205 AM PDT Mon Apr 6 2020 CAZ107-061015- /O.EXP.KEKA.WS.W.0004.000000T0000Z-200406T0900Z/ Northern Trinity- 205 AM PDT Mon Apr 6 2020 ...WINTER STORM WARNING HAS EXPIRED... A few snow showers may persist overnight, but accumulations are expected to be less than an inch. $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 3, 2:20 PM PDT | Small Craft Advisory | EKA | 23 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.