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
02/17/2017 - 11:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Wind loading and cornice formation on W aspect from the SE winds.Small reactive wind slab on W aspect, 8200', 2-6'' deep.Cracking and shooting cracks on wind loaded test slopes. Forecaster
03/13/2017 - 10:10
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Educator
Donner Summit Avalanche Semina
03/06/2013 - 08:00
Avalanche Observation 		Andesite Peak
Donner Summit Area
Professional Observer
01/03/2016 - 13:00
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Guide
Tahoe Mountain Scho
11/18/2012 - 10:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Professional Observer
01/19/2016 - 12:30
Avalanche Observation 		Andesite Peak
Donner Summit Area
Forecaster
03/07/2021 - 13:58
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
12/22/2018 - 15:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Educator
Tahoe Mountain Scho
12/13/2020 - 13:30
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Public
01/10/2023 - 11:30
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Natural storm slab avalanche failing sometime last night. Mostly covered by additional storm snow. Storm slab debris covered by additional storm snow today. Small storm slab intentionally triggered into gully feature. Storm slab avalanche debris into gully feature. Shooting cracks while moving into near treeline terrain with wind loading. Long shooting cracks off of skis in NTL terrain. Large cornices built out along ridges. Forecaster
04/15/2017 - 15:30
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Intentionally skier triggered loose wet avalanche on test slope entraining about the top 1 foot of the snowpack.Closer up view of same loose wet test slope avalanche.Skier triggered roller ball, ~2 ft diameter.Skier triggered roller ball, ~2.5 ft diameter. Forecaster
12/26/2016 - 10:10
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Forecaster
12/04/2016 - 13:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Guide
Tahoe Mountain Scho
03/01/2018 - 11:15
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Small natural storm slab. Small storm slab triggered from below. Wind slab failure on a test slope caused by the natural collapse of a cornice. 1 to 2 foot deep wind slabs failing on the old/new interface on a near treeline wind loaded slope. Triggered from lower angle terrain above the slope. Wind slabs avalanche triggered from the ridge. The avalanche also caused the lower angle slope next to it to shatter but the snow did not slide downhill on the lower angle slope. Shooting crack from lower angle terrain that then becomes a wind slab avalanche in the nearby steeper terrain. Forecaster

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