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
01/08/2016 - 07:00 W end Boreal Ridge above Central Sierra Snow Lab Donner Summit Area Snowpack Observation Educator
Donner Summit Avalanche Seminars
02/19/2016 - 14:30 Grass Lake Luther Pass Area (including Job and Freel) Snowpack Observation Educator
Lake Tahoe Community College - Wilderness Education
02/11/2018 - 11:45 Castle Valley Donner Summit Area Snowpack Observation Educator
Tahoe Mountain School
03/14/2017 - 10:15 South of Frog Lake Cliff Donner Summit Area Avalanche Observation
Educator
Donner Summit Avalanche Seminars
12/02/2017 - 13:00 Andesite Ridge Donner Summit Area Snowpack Observation Educator
Tahoe Mountain School
02/11/2016 - 10:30 Andesite Ridge Donner Summit Area Snowpack Observation Educator
Donner Summit Avalanche Seminars
01/08/2018 - 12:45 Andesite Ridge/Peak Donner Summit Area Snowpack Observation Educator
Donner Summit Avalanche Seminars
03/13/2017 - 10:10 Andesite Peak Donner Summit Area Snowpack Observation Educator
Donner Summit Avalanche Seminars
02/10/2016 - 11:01 Top Negro Canyon; W of Donner Ridge Donner Summit Area Snowpack Observation Educator
Donner Summit Avalanche Seminars
01/06/2018 - 12:30 Andesite Ridge Donner Summit Area Snowpack Observation Breakable Crust on Andesite RidgeCastle Peak with lift clouds around 12 30 Educator
Tahoe Mountain School
12/19/2016 - 13:00 1 km W of Castle Peak Donner Summit Area Snowpack Observation Educator
Donner Summit Avalanche Seminars
12/10/2017 - 12:10 Castle Pass Donner Summit Area Snowpack Observation Educator
Tahoe Mountain School
02/08/2018 - 10:00 South of Grouse Rock Blackwood Canyon or Ward Canyon Area Snowpack Observation Educator
Donner Summit Avalanche Seminars
01/16/2016 - 12:00 Below Becker Ridge Echo Summit Area Snowpack Observation Rain runnelsImpressive snow shedding off treesGraupelSignificant amounts of graupel Educator
Lake Tahoe Community College - Wilderness Education
01/24/2018 - 11:00 Lower Andesite Ridge Donner Summit Area Avalanche Observation
Educator
Tahoe Mountain School

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