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
12/06/2017 - 14:30
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Heavily wind scoured E aspect near summit. No snow remaining for future NE wind transport.2mECTP result along top of old nsf layer. Forecaster
03/08/2016 - 10:50
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Educator
Donner Summit Avalanche Semina
02/28/2015 - 13:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Professional Observer
03/31/2013 - 10:15
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Forecaster
01/08/2014 - 10:55
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Forecaster
12/12/2020 - 15:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Educator
Alpenglow Expeditio
01/13/2016 - 11:00
Avalanche Observation 		Andesite Peak
Donner Summit Area
Forecaster
03/19/2021 - 13:20
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Public
02/04/2017 - 14:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Clouds starting to break up after 3pm. Guide
Tahoe Mountain Scho
02/26/2018 - 12:30
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Cracking along ridge line Steep below tree line test slope displayed minimal cohesion in response to kicking. Guide
Tahoe Mountain Scho
02/10/2017 - 12:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Cornice kicks on test slopes produced limited loose snow with no signs of slab propagation.2x ECTN's on wind slabs off summit. 8200', E aspect. Forecaster
12/11/2022 - 12:00
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Crown from a natural wind slab avalanche in small terrain. Natural storm slab avalanche on small test slope. Intentionally skier triggered storm slab avalanche on small test slope. 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
03/17/2018 - 12:30
Avalanche Observation 		Andesite Peak
Donner Summit Area 		The second of two intentionally skier triggered wind slabs in E aspect terrain above treeline. The first of two intentionally skier triggered wind slabs in E aspect terrain above treeline. Two foot crown. 1.75 m (5.75 ft) of storm snow. CTH results with broken failure planes within the storm snow. ECTX in same pit. Signs of storm snow settlement on tree cones at 10am. The second of the two triggered wind slabs. Initial efforts created loose dry. Once the wind slab was triggered from a more prime location, the slab propagated back through the area that had previously failed as loose dry closer to the snow surface. Forecaster
03/19/2020 - 12:00
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Partially covered avalanche crown. Partially covered right flank. Avalanche debris ran downslope through the first set of trees. Forecaster

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