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
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
12/21/2014 - 12:30
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Professional Observer
02/09/2015 - 02:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Professional Observer
02/20/2021 - 09:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Two small wind slabs, both intentionally triggered. Wind slabs failing on a density change mid height within the wind drifted storm snow. Storm slab cracking while breaking trail. Large grauple at the old/new interface on top of rain crust. More clearing than expected leading to minor snow surface warming. Forecaster
12/12/2020 - 01:45
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Very Small Wind slab (NE aspect) Educator
Tahoe Mountain Scho
01/28/2021 - 12:30
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Loose dry sluffing run full path to bottom of small slope. Cracks around skis in BTL terrain. Deep and slow trail breaking conditions 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
12/30/2021 - 12:45
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Small cornice on Andesite Ridge Cornice formation on Andesite Peak Educator
Tahoe Mountain Scho
02/24/2017 - 10:45
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Educator
Donner Summit Avalanche Semina
12/28/2020 - 14:45
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Guide
Alpenglow Expeditio
12/16/2020 - 09:45
Snowpack Observation 		Andesite Peak
Donner Summit Area 		At least 5 whumpfs while ascending through this open area. 1 cm thick surface melt-freeze crust. 2mm thick surface melt-freeze crust. Signs of minor E wind scouring on ridgetop. 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
01/15/2021 - 10:45
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Educator
Outdoor Adventure Cl
04/15/2022 - 13:15
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Public

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