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 Videos Observation made by
01/24/2016 - 14:45 Andesite Peak Donner Summit Area Avalanche Observation Test slope failure on Andesite Peak Educator
Tahoe Mountain School
01/03/2017 - 12:00 Andesite Peak Donner Summit Area Avalanche Observation
Natural wind slab avalanche
Shooting cracks in wind loaded terrain near natural avalanche.
Forecaster
02/04/2017 - 14:00 Andesite Peak Donner Summit Area Snowpack Observation Clouds starting to break up after 3pm. Guide
Tahoe Mountain School
02/13/2017 - 13:00 Andesite Peak Donner Summit Area Snowpack Observation 5mm surface hoar wet at 3pm. Professional Observer
02/20/2017 - 10:50 Andesite Peak Donner Summit Area Avalanche Observation
Initial cracks triggered by kicking on the upper part of slope which caused the avalanche down lower at the mid slope convexity.
Initial cracks triggered by kicking on the upper part of slope which caused the avalanche down lower at the mid slope convexity.
The small avalanche in which skier was caught.
Red lines over crown of lower avalanche that occurred before ski pole drop. Green line over crown of small avalanche that carried skier.
Skier with deployed airbag after being carried 200 vertical feet by small avalanche, no burial.
Forecaster
02/05/2017 - 12:00 Andesite Peak Donner Summit Area Snowpack Observation Guide
Tahoe Mountain School
11/10/2017 - 13:00 Andesite Peak Donner Summit Area Snowpack Observation Public
04/07/2017 - 12:00 Andesite Peak Donner Summit Area Snowpack Observation Shooting cracks on wind loaded ridgeline near peak.  8200', E aspect.Wind loading with large built out cornices along upper ridge.ECTN's with no propagation in wind loaded terrain, 8100', E aspect. Forecaster
01/16/2016 - 16:16 Andesite Peak Donner Summit Area Snowpack Observation Public
12/24/2016 - 11:30 Andesite Peak Donner Summit Area Avalanche Observation
Forecaster
01/19/2016 - 12:30 Andesite Peak Donner Summit Area Avalanche Observation
Forecaster
01/22/2018 - 11:00 Andesite Peak Donner Summit Area Snowpack Observation Small cracking on above a ENE wind-loaded slope near the summit of AndesiteSkier-triggered pinwheels at 8000 ft. Forecaster
12/18/2016 - 14:00 Andesite Peak Donner Summit Area Snowpack Observation 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 School
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
01/13/2016 - 10:30 Andesite Peak Donner Summit Area Snowpack Observation Forecaster

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