Please remember that these observations indicate what was going on in the snowpack at a single point in time and space. They may not represent conditions where you are or where you plan to be. They also come from a variety of sources. SAC cannot vouch for the quality or accuracy of any observations that come from the general public. Some of these may be professional quality observations; some may not. Please use observations listed on this page as part of your information gathering process, but as always don't make decisions based on a single piece of information.

If you are looking for more information on how to understand the information on this page, all of the pit data graphs and stability tests are part of what is presented in a Level II avalanche class that follows the American Avalanche Association (AAA) or American Institute for Avalanche Research and Education (AIARE) curriculum guidelines. All of the coding and abbreviations for data presented follows the publication Snow, Weather, and Avalanches: Observational Guidelines for Avalanche Programs in the United States (SWAG) which is the standard for all professional avalanche programs in the US. An electronic copy is available here. Most of what you are looking for is in Chapter 2 and Appendix F part 1. We use a program called SnowPilot to create the snowpit graphs. It is available as an online tool or as a downloadable program at http://www.snowpilot.org/. This website also has a quick video and user guide on how to use create snowpits. Please send us your observations using the buttons below.

Date and time of observation or avalanche occurrence Location Region Observation Type Photos Snowpack, Avalanche, Weather Videos Snowpit videos (tests, etc) Observation made by
04/15/2017 - 15:30 Andesite Peak Donner Summit Area Snowpack Observation Intentionally skier triggered loose wet avalanche on test slope entraining about the top 1 foot of the snowpack.Closer up view of same loose wet test slope avalanche.Skier triggered roller ball, ~2 ft diameter.Skier triggered roller ball, ~2.5 ft diameter. Forecaster
01/15/2017 - 13:00 Andesite Peak Donner Summit Area Snowpack Observation Guide
Tahoe Mountain School
12/02/2017 - 12:00 Andesite Peak Donner Summit Area Snowpack Observation Photo 1: Average height of snow near summit of AndesitePhoto 2: South Face of Castle Guide
Alpenglow Expeditions
02/10/2017 - 12:00 Andesite Peak Donner Summit Area Snowpack Observation 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
01/20/2017 - 15:45 Andesite Peak Donner Summit Area Avalanche Observation
D2 Wind slab avalanche triggered by a small cornice piece
Small avalanche triggered by a larger piece of cornice
Cracking in the storm snow on in below treeline terrain
Forecaster
01/16/2016 - 16:16 Andesite Peak Donner Summit Area Snowpack Observation Public
12/26/2016 - 11:00 Andesite Peak Donner Summit Area Snowpack Observation Forecaster
02/24/2017 - 10:45 Andesite Peak Donner Summit Area Snowpack Observation Educator
Donner Summit Avalanche Seminars
01/06/2016 - 10:30 Andesite Peak Donner Summit Area Snowpack Observation Forecaster
01/21/2018 - 16:07 Andesite Peak Donner Summit Area Snowpack Observation Educator
Tahoe Mountain School
03/09/2016 - 10:30 Andesite Peak Donner Summit Area Snowpack Observation Forecaster
02/25/2017 - 13:04 Andesite Peak Donner Summit Area Snowpack Observation Guide
Tahoe Mountain School
04/15/2018 - 09:30 Andesite Peak Donner Summit Area Snowpack Observation Increasing cloud cover over the Sierra Crest at 9:30 am. One inche of surface wet snow on ESE aspect at ~8,100' at 9:30 am. Forecaster
02/17/2017 - 11:00 Andesite Peak Donner Summit Area Snowpack Observation 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
02/02/2017 - 11:00 Andesite Peak Donner Summit Area Avalanche Observation
Storm Slab.  4'' deep, 7900', NE aspect.
Debris from storm slab (D1).
Storm slab, 4'' deep, 7900', NE aspect.
Wind Slab, 4-8'' deep, 8100', E aspect, 38 degree slope.
Forecaster

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