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
01/23/2016 - 11:55
Snowpack Observation 		Andesite Meadows
Donner Summit Area 		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
12/22/2018 - 15:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Educator
Tahoe Mountain Scho
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
03/06/2016 - 14:00
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
11/12/2020 - 11:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Thin snowpack at 7800', E aspect, in below treeline terrain. Limited to no snow on southerly aspects. Previous NE/E wind scouring on the top of Andesite Peak Forecaster
12/16/2016 - 12:30
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Small localized cracking in wind loaded terrain. E aspect 8200'Small cornice kicks did not cause any wind slab failure. 8200', E aspect.ECTN and ECTP in wind loaded E aspect. 8200'.Cracking around skis into non frozen rain crust Forecaster
01/07/2016 - 10:50
Avalanche Observation 		Andesite Peak
Donner Summit Area
Guide
Tahoe Mountain Scho
12/18/2016 - 14:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		NE wind scouring at 8200' Andesite Peak4'' recent storm snow over firm rain crust. Faceting occuring around recent rain crust.NE wind scouring at 8200' E aspect of peak. Guide
Tahoe Mountain Scho
02/18/2017 - 14:21
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Public
03/06/2013 - 08:00
Avalanche Observation 		Andesite Peak
Donner Summit Area
Professional Observer
03/10/2014 - 13:00
Avalanche Observation 		Andesite Peak
Donner Summit Area
Professional Observer
01/13/2016 - 10:30
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Forecaster
03/01/2020 - 11:45
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Loose dry avalanche on a steep slope sheltered from the wind that entrained the new snow Forecaster

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