A stronger winter storm produced several waves of new snow and high winds that impacted the region during the third week of January. A relatively long-duration atmospheric river from 9-11 January supported forcing and moisture for the first in the series of winter systems that brought heavy Sierra snowfall with accumulations ranging from 3-6 feet across the Sierra Crest. The heaviest snowfall occurred in Mono County over the 3-day period with heavy, unrelenting snowfall that forced a prolonged closure of US-395 from Bridgeport to Bishop from late morning January 9th through the afternoon January 11th.  On January 9th, heavy rain across the Lake Tahoe Basin changed to heavy snow below 7000 ft, leading to snowfall totals ranging from 8-20 inches through January 11th. Over 2 feet of snowfall was observed in parts of northeast California above 5000 feet. On January 9th mostly rain fell across western Nevada with storm total precipitation amounts ranging between 0.75-2 inches across much of Douglas, Carson City, southern Washoe, Mineral, and Lyon counties. The heavier rainfall across those contributed to a major rockfall and subsequently lead to an extended road closure on SR-208 in Wilson Canyon (Figure 4). Reports of areal flooding included I-80 near Lockwood, NN, Geiger Grade at Toll Rd in the Virginia City highlands, and along US-395 south of Reno with flooding from Steamboat Creek spilling over Towne Road. The changeover to snow in western Nevada arrived during the morning commute on January 10th which led to several related traffic incidents that included a 19-car pile-up on the Galena Bridge on I-580.

High Wind in GREATER LAKE TAHOE AREA, NEVADA
From 10-JAN-23 11:57:00 to 10-JAN-23 11:57:00 (PST-8)
Magnitude: 65.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet Station (NV DOT-REV) located along US-95 near Walker Lake, NV reported a peak wind gust from the south at 75 mph at 11:57 AM.

Heavy Snow in GREATER LAKE TAHOE AREA, NEVADA
From 10-JAN-23 08:00:00 to 11-JAN-23 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter  located  1.0 mi NNW of Incline Village reported a 24 hour snowfall total of 15.5 inches (SWE: 1.59 inches), as well as 3 day storm total snowfall amount  of  27.5 inches.

Heavy Rain in WASHOE, NEVADA
From 09-JAN-23 08:00:00 to 10-JAN-23 08:00:00 (PST-8)
Location: RENO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

COCORAHS stations  located 1.7 mi E of Sparks, NV (NV-WH-31), and 1.7 mi WSW of  Reno, NV (NV-WH-133), reported a 24 hour  rainfall amounts of 0.97 and 0.99 inches respectively.

Heavy Snow in GREATER LAKE TAHOE AREA, NEVADA
From 10-JAN-23 09:00:00 to 11-JAN-23 09:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public at the Mount Rose Ski Base and Diamond Peak Ski Base reported 24 hour snowfall totals of 12 and 22 inches respectively, as well as 3 day storm total snowfall amounts  of  56 and 31 inches respectively.

Heavy Rain in WASHOE, NEVADA
From 09-JAN-23 10:00:00 to 10-JAN-23 10:00:00 (PST-8)
Location: (RNO)CANNON ARPT REN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

An ASOS located at the Reno-Tahoe International airport and an official NWS observation located 2.0 SSW of  Sun Valley, NV, reported a 24 hour  rainfall amounts of 1.00 and 1.07 inches respectively.

Heavy Rain in WASHOE, NEVADA
From 09-JAN-23 09:00:00 to 10-JAN-23 09:00:00 (PST-8)
Location: INCLINE VLG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

COCORAHS station located 0.9 mi ESE of the Diamond Peak Ski Base (NV-WH-121) reported a 24 hour rainfall amount of 1.66 inches.

Debris Flow in LYON, NEVADA
From 10-JAN-23 18:00:00 to 10-JAN-23 18:00:00 (PST-8)
Location: WILSON CANYON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A massive landslide on State Route 208 through Wilson Canyon forced the closure of the highway for an indeterminate amount of time. The Nevada Department of Transportation (NDOT) says the rockslide was likely caused by the recent heavy precipitation. The debris fell across roughly 400 feet of roadway around 6:00 PM Tuesday night, NDOT estimates.
There were no immediate indications of any injuries due to the landslide.