A series of eastern Pacific winter storm pulses, occasionally aided by induction of warmer sub-tropical moisture, caused a variety of hazardous winter conditions that disrupted holiday travel and commerce over the Sierra and western NV.

Winter Storm in MINERAL/SOUTHERN LYON, NEVADA
From 23-DEC-21 08:00:00 to 24-DEC-21 04:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Road Closed (Road Hazard) - on US-6 in both directions between SR-360/Mina-Basalt Cutoff Rd and the California State-line in Mineral County Nevada.

Winter Storm in GREATER LAKE TAHOE AREA, NEVADA
From 22-DEC-21 00:00:00 to 22-DEC-21 07:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter and the public reported an estimated accumulation of 0.01��� of freezing precipitation 3.0 mi E of Verdi, greater areas of the city of Reno, and 1.0 E of Spanish Springs in Washoe County.

Heavy Snow in MINERAL/SOUTHERN LYON, NEVADA
From 23-DEC-21 10:00:00 to 23-DEC-21 23:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

NDOT road crew personnel reported heavy snow that fell between 10AM to 11PM with storm total snow estimated between 1'-2' along US Highway 6 to Montgomery Pass in Mineral County.

Winter Storm in GREATER RENO/CARSON CITY/MINDEN AREA, NEVADA
From 25-DEC-21 12:00:00 to 26-DEC-21 12:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The following information was included in High Impact Event report issued 12/26/2021 and 12/27/2021.
Interstate-80 was closed through at least mid-day Monday when the conditions were re-evaluated. Based on the heavy snow forecast Interstate remained closed until Tuesday with no specific estimated opening time. Virtually all trans-Sierra routes are closed due to snow and/or wind impacts - this is also unusual to have so many routes disrupted this long. Caltrans received email briefings from both WFO Reno and WFO Sacramento.
Southwest Airlines, the largest carrier in Reno, had cancelled all flights today and tonight (12/26/2021), due to wind concerns. Coordination with Reno Airport operations on snow and wind trends.
Accident involving 20-cars on Interstate 580 between Reno and Carson City with at least 6 injuries requiring hospitalization. Blowing slow occurring at the time of accident.
Highway 395 in the Eastern Sierra closed for prolonged periods, due to measured wind gusts near the highway of 85 to 98 mph, blowing snow, and low visibility. This is a major route between LA, Mammoth, and Reno.
All ski areas in the Tahoe region were closed due to dangerous conditions and high winds. Massive impacts likely to people on holiday who may now be stranded at these resorts possibly into Monday and Tuesday.
Several avalanche reports in the Eastern Sierra but no damage or injuries reported. One occurred near Alpine Meadows closing the only road in and out of the ski area.
An avalanche occurred in the Tahoe area, closing CA 89 which is the main route from Tahoe to I-80. This along with the continued hazardous snowfall and winds, had resulted in the closure of all ski areas in the Tahoe-Truckee region through Monday (12/27/2021).

Winter Storm in GREATER RENO/CARSON CITY/MINDEN AREA, NEVADA
From 23-DEC-21 12:00:00 to 27-DEC-21 12:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The Reno 88D radar on Virginia Peak had been without commercial power for roughly 4 days. A visit to the site by electronics staff via snowcat on Christmas Day accessed there was ample generator fuel for about 5 additional days. WFO Reno continued to work with NV Energy on getting commercial service restored, including reaching out to their emergency manager.

Flood in WASHOE, NEVADA
From 23-DEC-21 09:00:00 to 23-DEC-21 10:00:00 (PST-8)
Location: HAROLDS TRAPSHOOT SP
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained weather spotter reported minor flooding along Pyramid Highway and Eagle Canyon Dr.

Flood in WASHOE, NEVADA
From 23-DEC-21 09:00:00 to 23-DEC-21 10:00:00 (PST-8)
Location: SPARKS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

NDOT closed I-80 and Rock Blvd underpass due to minor flooding.

High Wind in MINERAL/SOUTHERN LYON, NEVADA
From 26-DEC-21 04:00:00 to 26-DEC-21 05:00:00 (PST-8)
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station (WLKNV)  6.1 mi NW of Hawthorne (NV DOT) reported wind gust of 61 mph.

High Wind in GREATER RENO/CARSON CITY/MINDEN AREA, NEVADA
From 26-DEC-21 02:00:00 to 26-DEC-21 03:00:00 (PST-8)
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station (NV021)  2.0 mi SW of Gardnerville(NV DOT) reported wind gust of 65 mph.

High Wind in GREATER RENO/CARSON CITY/MINDEN AREA, NEVADA
From 26-DEC-21 08:00:00 to 26-DEC-21 09:00:00 (PST-8)
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station (WASNV)  3.2 mi S of Washoe City(NV DOT) reported wind gust of 66 mph.

Heavy Snow in GREATER RENO/CARSON CITY/MINDEN AREA, NEVADA
From 25-DEC-21 09:00:00 to 26-DEC-21 09:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained weather spotter reported a 24 hr snowfall total of 8��� of new 3.0 mi WSW of Gardnerville Ranch, NV.

Heavy Snow in GREATER RENO/CARSON CITY/MINDEN AREA, NEVADA
From 26-DEC-21 08:00:00 to 27-DEC-21 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Local newspaper reported via social media that Genoa, NV received 9.5��� of new snow.

Heavy Rain in LYON, NEVADA
From 22-DEC-21 08:00:00 to 23-DEC-21 08:00:00 (PST-8)
Location: DAYTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

COCORAHS station (nv-ly-15) 3.4 mi NE of Dayton,NV reported 1.52��� of heavy rain.

Heavy Snow in GREATER LAKE TAHOE AREA, NEVADA
From 23-DEC-21 08:00:00 to 24-DEC-21 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters and the public reported heavy snowfall amounts up to 19��� 1.0 mi NNW of Incline Village as well as 22��� at the MT. Rose Ski Base.

Heavy Snow in GREATER RENO/CARSON CITY/MINDEN AREA, NEVADA
From 25-DEC-21 09:00:00 to 26-DEC-21 09:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Official NWS OBS reported 24hr heavy snowfall amounts of 9��� at the NWS Reno Office while the public reported 24hr heavy snowfall amounts of 23 at the MT. Rose Ski Base and 32��� at the Diamond Peak Ski Base.

Heavy Snow in GREATER LAKE TAHOE AREA, NEVADA
From 26-DEC-21 07:30:00 to 27-DEC-21 07:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported 24hr heavy snowfall amounts of 18��� at the Diamond Peak Ski Base and 30��� at the MT. Rose Ski Base.