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
12/29/2018 - 14:15
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Visual outline of the Snowpack on a West Aspect Near Treeline @ 7600' Educator
Tahoe Mountain Scho
02/24/2017 - 10:45
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Educator
Donner Summit Avalanche Semina
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
01/03/2016 - 13:00
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Guide
Tahoe Mountain Scho
03/09/2016 - 10:30
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Forecaster
12/12/2020 - 15:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Educator
Alpenglow Expeditio
01/19/2016 - 12:30
Avalanche Observation 		Andesite Peak
Donner Summit Area
Forecaster
11/15/2022 - 14:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		East winds scouring east facing slopes and blowing snow onto west facing slopes. A small shallow pocket of wind-drifted snow on the west side of Andesite. It did not extend very far away from the ridge and it was difficult to make it crack. I had to under cut it first. More east wind transport along the summit of Andesite Peak This image shows some buried surface hoar mixed in with other snow grains. I found this thin layer about 3-4 inches (10cm) below the surface in a meadow. Forecaster
12/01/2019 - 11:00
Snowpack Observation 		Andesite Peak
Mount Rose Area 		Small cornice kicks on test slopes did not initiate any avalanches. HS=95cm Some starting zones not filled in yet with rocky terrain. Forecaster
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
12/21/2018 - 11:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Wind loaded test slopes showing unreactive slabs. Minor cracking on old/new snow interface while breaking trail. Skier triggered rollerballs after about 2 hrs of very light rain. Forecaster
03/13/2018 - 11:00
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Large pinwheels triggered by ski kicks at the top of the slope on a ENE aspect @ 8000 ft. Loose wet sluff mixed with large pinwheels on an E aspect @ 7400 ft. Forecaster
03/13/2023 - 12:15
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Storm slab, intentionally skier triggered, BTL terrain around 7,800' Storm slab, intentionally skier triggered, BTL terrain around 7,800' Storm slab cracking while breaking trail in wind protected BTL terrain. Moving above the skin track so that the storm slab was undercut made it easy to identify the layering. Shooting crack Forecaster
02/25/2017 - 13:04
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Guide
Tahoe Mountain Scho
03/03/2018 - 12:30
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Forecaster

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