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
03/25/2012 - 12:00
Snowpack Observation 		Anderson Ridge
Donner Summit Area 		Professional Observer
01/01/2013 - 11:30
Snowpack Observation 		Anderson Ridge
Donner Summit Area 		Professional Observer
04/02/2016 - 10:00
Snowpack Observation 		Anderson Ridge
Donner Summit Area 		Public
12/18/2016 - 11:57
Snowpack Observation 		Anderson Ridge
Donner Summit Area 		running water down low90cm HS 15cm fluff w thick ice layerboiler plate with blown in fluff and east winds up highundisturbed fluff on hard crust, some hoar in sheltered areas Public
03/27/2020 - 10:45
Avalanche Observation 		Anderson Ridge
Donner Summit Area 		Public
01/19/2018 - 15:30
Snowpack Observation 		Anderson ridge
Donner Summit Area 		Public
04/04/2020 - 16:45
Snowpack Observation 		Andesite
Donner Summit Area 		Top of hand pit with 6” on new snow on crust Hand pit showed a weaker/softer snow below the sun crust. Easy fracture at below the crust, then surprisingly another fracture 10-12” inches below the crust. Stomped on cornice and pushed off a small slide Stomped on cornice again further down and it broke up to 25’ away Public
01/05/2021 - 12:00
Snowpack Observation 		Andesite
Donner Summit Area 		Guide
Alpenglow Expeditio
12/22/2017 - 12:30
Snowpack Observation 		Andesite
Donner Summit Area 		Guide
Alpenglow Expeditio
12/31/2022 - 13:31
Snowpack Observation 		Andesite
Donner Summit Area 		Guide
Alpenglow Expeditio
02/24/2022 - 14:00
Snowpack Observation 		Andesite
Donner Summit Area 		Snow observation demonstration for A1 students Educator
West Wind Collecti
12/03/2022 - 12:01
Snowpack Observation 		Andesite
Donner Summit Area 		Cinnamon roll near top of Andesite Roller balls and cinnamon rolls on andesite Guide
Alpenglow Expeditio
01/24/2021 - 09:00
Snowpack Observation 		Andesite
Donner Summit Area 		1 cm + surface hoar found widespread in open meadows at Andesite 01/24 Educator
International Alpine Guid
04/12/2018 - 11:00
Snowpack Observation 		Andesite and Castle Peak
Donner Summit Area 		Skier triggered shooting crack on a wind loaded E facing test slope Small ski triggered wind slab failure on an E facing test slope Increasing clouds across the Sierra Crest around noon NW winds scouring the ridge on Castle Peak at 11:15 am Forecaster
02/08/2014 - 13:30
Snowpack Observation 		Andesite Meadow
Donner Summit Area 		Professional Observer

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