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
12/06/2014 - 11:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Professional Observer
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
12/14/2021 - 12:30
Snowpack Observation 		Andesite Peak
Donner Summit Area 		4+ ft of new snow had accumulated on the lower elevations of Andesite with more at the higher elevations. Minor cracking in a soft wind slab on a wind-loaded E facing test slope around 8100 ft on Andesite Peak Wind-loaded test slope on Andesite Peak. Ski kicks released small pieces of cornice that then triggered small sluffs in the new snow on this slope. It looked like there was buried debris at the bottom of the slope indicating that it had avalanched sometime during the storm. Wind-loaded slope where I could trigger loose snow sluffs by pushing snow onto the slope with my pole from a safe spot above the slope. It looked like there was buried debris at the bottom of this slope as well. Forecaster
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
12/14/2016 - 11:30
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Rain runnels existed up to Peak level (8200'). Forecaster
04/16/2014 - 11:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Forecaster
10/27/2021 - 14:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Cornices above E aspect slopes on summit ridge of Andesite Pk. Cornice collapse and snow wet snow entrainment and roller balls. Free water at the base of the snowpack along the Castle Rd. Forecaster
12/28/2022 - 11:30
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Small cornice collapse on Andesite Ridge PS 5-10 cm at all elevations Guide
International Alpine Guid
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
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
12/18/2021 - 12:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Large surface hoar in Castle Valley Large surface hoar in Castle Valley Settlement cone on Andesite Peak Guide
Alpenglow Expeditio
02/03/2016 - 10:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Forecaster
01/22/2023 - 08:45
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Drifting snow depositing as a hard slab on W aspect terrain. Thin melt-freeze crust from warming on Saturday. Smooth, supportable hard slab on NW aspect terrain near treeline. Substantial wind scouring on E aspect terrain near treeline. Substantial wind texture on E aspect terrain below treeline. Forecaster
03/26/2014 - 11:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		, Professional Observer
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

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