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
02/18/2017 - 14:21
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Public
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
03/20/2013 - 09:30
Avalanche Observation 		Andesite Peak
Donner Summit Area
Professional Observer
03/15/2015 - 14:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Professional Observer
11/10/2017 - 13:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Public
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
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
04/15/2021 - 11:15
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Small rollerballs and pinwheels made of the storm snow on an E aspect on Andesite Peak Less than an inch of recent snow on top of older melt/freeze layers Small, shallow wind drifted snow on a W aspect near the summit of Andesite Signs of wind NE wind scouring Snow coverage on the SW and W aspects on Castle Peak Breakable crusts were widespread on Andesite in the morning. 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
03/10/2014 - 13:00
Avalanche Observation 		Andesite Peak
Donner Summit Area
Professional Observer
02/05/2023 - 12:30
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Skier triggered wind slab avalanche on a wind-loaded test slope on Andesite Peak. A previous skier had triggered this small wind slab near the summit of Andesite Peak. Skier-triggered storm slab avalanche on a near treeline test slope. Large cornices existed above most wind loaded slopes. This slope also cracked as we approached it from the side. Cracking in the storm snow around our skis. These cracks failed on a density change in the storm snow, the graupel layer at the base of the storm snow, and the buried surface hoar just below the old/new interface. Buried surface hoar on a NE facing slope in below treeline terrain on Andesite Peak. Graupel at the base of the storm snow. Forecaster
03/31/2013 - 10:15
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Forecaster
02/04/2017 - 14:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Clouds starting to break up after 3pm. Guide
Tahoe Mountain Scho
02/11/2023 - 13:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		The newly formed winds slabs measured about 10-12 inches at their deepest and quickly got thinner (2 inches thick about 5 ft from my skis) as you moved down slope. More wind slab cracking on the W facing side of Andesite Peak. Small wind slabs had formed on W aspects near the top of Andesite. These cracked when I stepped on them. This wind slab is thickest near the ridge and tapers down to a couple inches thick within 10 feet of the ridge. It was typical of the wind slabs I saw today. Wind scoured surfaces were widespread along the ridge tops. Wind scoured surfaces were widespread along the ridge tops. Wind-sculpted snow surfaces on the E aspects of Andesite Peak. The NE winds were moving snow enough snow in open areas near treeline to fill this skin track in less than 30 minutes. About 2 inches of new snow accumulated on Andesite with closer to 3 inches reported from higher on Castle Peak Forecaster
12/01/2022 - 14:42
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Public

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