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
03/06/2013 - 08:00
Avalanche Observation 		Andesite Peak
Donner Summit Area
Professional Observer
03/06/2019 - 13:00
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Right flank of slide Left flank of slide Public
04/28/2023 - 11:00
Avalanche Observation 		Andesite Peak
Donner Summit Area 		D1 wet loose avalanche triggered by a ski cut above the slope on an ENE aspect @ 11:00 am Small sluff of wet snow triggered by a ski kick above the slope @10:45 am. Another small wet loose avalanche triggered by a ski cut above a NE facing slope @ 11:15 am. Ankle-deep wet snow on an E aspect at 10:15 am. Runnels in the snow surface indicating melt water draining through the snowpack Forecaster
02/25/2017 - 13:04
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Guide
Tahoe Mountain Scho
04/16/2018 - 11:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Small wind slab triggered by large cornice drop on a ENE facing test slope at 8040 ft. See video. Small 1 to 4 inch slab triggered on an E facing test slope @ 8040 ft. that had just received a short period of sun-exposure The other side of the small slab triggered on the E facing test slope. New snow and some wind-loading filling in the skin track @ 8160 ft. About 30 cm (1 ft) of new snow resting on top of a moist crust on top of wet snow in a meadow at 7500 ft. Forecaster
02/12/2019 - 11:45
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Moderate amounts of blowing snow noted as we approached near treeline terrain. Skin track refill in above treeline terrain. Skier triggered shooting crack 20 ft long and 1 ft deep in wind slab on test slope. Another party's snowboard cut did not produce results on this wind loaded slope. Forecaster
12/01/2022 - 14:42
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Public
12/01/2018 - 11:00
Avalanche Observation 		Andesite Peak
Donner Summit Area 		One of several natural wind slab avalanches on Andesite Peak, E aspect, ~8,100'. Cracking triggered while breaking trail below treeline. Early signs of the instability in the area. The first wind loaded feature we approached at treeline, E aspect,~7,900'. Intentional remote skier triggered avalanche. View from triggering location. 20' shooting crack to where avalanche occurred. Pointing to far flank on the large bump in low visibility. 20' skier triggered shooting crack in near treeline terrain, ENE aspect. Another natural wind slab avalanche, above treeline terrain, ENE aspect, ~8,100'. Still another natural wind slab avalanche, above treeline terrain, ENE aspect, ~8,100'. Wide propagation with the far flank about 2/3rds of the way across the open slope in the background. Easily 200' wide. Forecaster
03/07/2021 - 13:58
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Public
12/13/2020 - 13:30
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Public
01/03/2016 - 13:00
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Guide
Tahoe Mountain Scho
01/19/2016 - 12:30
Avalanche Observation 		Andesite Peak
Donner Summit Area
Forecaster
01/08/2023 - 11:30
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Public
12/14/2016 - 11:30
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Rain runnels existed up to Peak level (8200'). Forecaster
02/13/2019 - 11:00
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Long shooting crack on storm snow instability. Natural avalanche that failed early this morning on a storm snow weakness at the beginning of the storm snow Forecaster

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