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
04/09/2018 - 08:30 Andesite Peak Donner Summit Area Snowpack Observation Open areas between 7,200' and 8,200' held a refreeze of the top 4 to 6 inches of the snow surface at 8:00 am. Snow surface in melt phase on E aspect at 7,540' at 8:30 am. Forecaster
12/24/2016 - 11:30 Andesite Peak Donner Summit Area Avalanche Observation
Forecaster
03/13/2018 - 11:00 Andesite Peak Donner Summit Area Avalanche Observation Large pinwheels triggered by ski kicks at the top of the slope on a ENE aspect @ 8000 ft. Loose wet sluff mixed with large pinwheels on an E aspect @ 7400 ft. Forecaster
12/06/2017 - 14:30 Andesite Peak Donner Summit Area Snowpack Observation Heavily wind scoured E aspect near summit. No snow remaining for future NE wind transport.2mECTP result along top of old nsf layer. Forecaster
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
02/16/2017 - 11:30 Andesite Peak Donner Summit Area Avalanche Observation
Split-board kicks triggered a refrigerator sized cornice failure onto the wind loaded test slope. This resulted in a 12-14 inch deep wind slab failure.
The other side of the wind slab that resulted from the cornice drop.
Wind slab cracking in an undercut wind-loaded slope
Forecaster
12/14/2017 - 11:00 Andesite Peak and S aspect of Castle Pk Donner Summit Area Snowpack Observation Forecaster
12/11/2016 - 14:00 Andesite Peak NW Shoulder Donner Summit Area Snowpack Observation

IMG 3562

Guide
Tahoe Mountain School
12/22/2015 - 11:00 Andesite Ridge Donner Summit Area Snowpack Observation Forecaster
01/05/2016 - 12:00 Andesite Ridge Donner Summit Area Avalanche Observation
Forecaster
03/24/2018 - 01:30 Andesite Ridge Donner Summit Area Snowpack Observation Guide
Tahoe Mountain School
11/20/2015 - 10:00 Andesite Ridge Donner Summit Area Snowpack Observation Forecaster
02/19/2016 - 13:51 Andesite Ridge Donner Summit Area Avalanche Observation
Forecaster
12/15/2015 - 12:55 Andesite Ridge Donner Summit Area Snowpack Observation Forecaster
02/19/2017 - 14:00 Andesite Ridge Donner Summit Area Snowpack Observation Guide
Tahoe Mountain School

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