This winter storm shaped out to be the strongest of our recent series of late February winter storms. A low positioned off-shore the Pacific Northwest set a favorable pattern for the transport of colder northern Pacific moisture that wrapped into an attendant cold front. This storm possessed a combination of a cold air mass, sufficient moisture, strong winds, instability, and dynamic forcing to produce heavy Sierra snowfall with periods of blizzard conditions Monday through early Wednesday. With snow rations approaching 15-17:1, the light fluffy snowfall coupled with wind gusts exceeding 50 mph brought near zero visibility at times to Sierra communities Monday afternoon through Tuesday afternoon. Sierra ridge tops saw wind gusts over 100 mph through this period. This storm system also contributed to prolonged winter travel impacts.

Heavy Snow in MONO, CALIFORNIA
From 27-FEB-23 07:00:00 to 28-FEB-23 07:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public located at the Mammoth Mountain Ski Base and June Mountain Ski Base reported a 24 hour snowfall totals of 20.0 inches and 15.0 inches respectively.

High Wind in GREATER LAKE TAHOE AREA, CALIFORNIA
From 27-FEB-23 01:33:00 to 27-FEB-23 01:33:00 (PST-8)
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station (TADC1) Tahoe-Donner located 4.0 mi WNW of  Truckee, CA,  reported a peak wind gust of 59 mph.

High Wind in MONO, CALIFORNIA
From 27-FEB-23 05:35:00 to 27-FEB-23 05:35:00 (PST-8)
Magnitude: 90.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station (MTH03) Mammoth Mountain located 1.7 mi S of the Mammoth Mountain Ski Summit, CA,  reported a peak wind gust of 103 mph.

Heavy Snow in GREATER LAKE TAHOE AREA, CALIFORNIA
From 27-FEB-23 07:00:00 to 28-FEB-23 07:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public located at the Homewood Mountain Ski Summit, CA, the Northstar Ski Summit, CA, the Palisades Tahoe Alpine Lodge, and the Heavenly Ski Summit, CA, reported 24 hour snowfall totals of 36 inches, 27 inches, 22 inches, and 19 inches respectively.

Heavy Snow in GREATER LAKE TAHOE AREA, CALIFORNIA
From 27-FEB-23 06:00:00 to 28-FEB-23 06:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A CO-OP observer located at the Truckee-Tahoe Airport in Truckee, CA,  reported a 24 hour total snowfall amount of 12.0 inches.

Winter Storm in GREATER LAKE TAHOE AREA, CALIFORNIA
From 27-FEB-23 10:00:00 to 28-FEB-23 13:55:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The Donner Pass RWIS from Caltrans has shown several prolonged periods of visibilities below 0.1 mile in snow and wind since 10 AM Monday - including an ongoing period below 0.25 miles 6 AM to 1 PM Tuesday.

Blizzard in MONO, CALIFORNIA
From 27-FEB-23 03:30:00 to 27-FEB-23 03:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Mammoth Lakes Airport peaked out with gusts of 62 MPH, heavy snow, and visibility less than one quarter mile at 330 AM this morning.

Heavy Snow in GREATER LAKE TAHOE AREA, CALIFORNIA
From 27-FEB-23 07:00:00 to 28-FEB-23 07:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

CO-OP observers located at Tahoma, CA, Tahoe City, CA, and Boca Reservoir, CA, reported 24 hour snowfall totals of 25.0 inches, 17.5 inches, and 15.5 inches respectively.