These observations document past conditions at a small and variable scale. They are not to be confused with an avalanche forecast. They come from a variety of sources. We can only vouch for the quality of those produced by the SAC forecasters and professional observers.
Date and time of observation or avalanche occurrence Location Media Observation made by
03/29/2011 - 15:32
Snowpack Observation 		Andesite Ridge
Donner Summit Area 		Forecaster
01/08/2016 - 11:00
Snowpack Observation 		Andesite Ridge
Donner Summit Area 		Forecaster
03/25/2018 - 12:00
Avalanche Observation 		Andesite Ridge
Donner Summit Area 		Public
02/14/2011 - 12:30
Snowpack Observation 		Andesite Ridge
Donner Summit Area 		, Forecaster
01/27/2017 - 12:00
Snowpack Observation 		Andesite Ridge
Donner Summit Area 		Wind transport and scouring along Andesite RidgeSkier triggered crack on a wind loaded W facing test slopeNatural cracking on a wind loaded W facing test slope Forecaster
12/31/2012 - 11:20
Snowpack Observation 		Andesite Ridge
Donner Summit Area 		Forecaster
11/28/2020 - 10:15
Snowpack Observation 		Andesite Ridge
Donner Summit Area 		Shallow supportable snowpack with numerous but avoidable hazards. Previous wind scouring on the ridgetop leaving behind sastrugi formations. Previous wind scouring on E aspects at treeline and above treeline. Ridgetop drifts perched above W aspect from previous E winds. W aspect pit location. Forecaster
02/06/2012 - 16:00
Snowpack Observation 		Andesite Ridge
Donner Summit Area 		Forecaster
02/28/2014 - 10:00
Snowpack Observation 		Andesite Ridge
Donner Summit Area 		looking south along Andesite Ridge , Professional Observer
12/23/2017 - 14:30
Snowpack Observation 		Andesite Ridge
Donner Summit Area 		Wind loaded area on Andesite RidgeCloud cover and thin coverage on S. side of Castle Peak Educator
Tahoe Mountain Scho
01/29/2017 - 15:00
Snowpack Observation 		Andesite Ridge
Donner Summit Area 		scouring from E wind looking south from Andesite PeakSurface hoar near skin track to Castle Pass Guide
Tahoe Mountain Scho
02/06/2017 - 10:06
Snowpack Observation 		Andesite Ridge
Donner Summit Area 		Public
02/11/2023 - 15:26
Snowpack Observation 		Andesite Ridge
Donner Summit Area 		Pit wall showing a layer of graupel (2/5) from 37 to 38 cm down. Graupel 3 mm to 5 mm. Graupel 3 mm to 5 mm. Graupel 3 mm to 5 mm. CTM (14) SP Educator
Blackbird Mountain Guid
04/25/2012 - 11:00
Snowpack Observation 		Andesite Ridge
Donner Summit Area 		Forecaster
03/17/2011 - 13:00
Snowpack Observation 		Andesite Ridge
Donner Summit Area 		Forecaster

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