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 This website also has a quick video and user guide on how to use create snowpits. Please send us your observations using the button above.
Date and time of observation or avalanche occurrence Location Region Observation Type Photos Snowpack, Avalanche, Weather Videos Snowpit videos (tests, etc) Observation made by
01/17/2020 - 13:30 Waterhouse Snowpack Observation Public
02/01/2020 - 13:00 Near Bear meadow Independence Lake Area Avalanche Observation Loose wet avalanche Public
03/26/2020 - 11:30 Silver Peak Cabin Creek, Deep Creek, or Pole Creek Area Avalanche Observation Skier triggered Avalanche Public
03/02/2020 - 12:00 Relay Peak Mount Rose Area Snowpack Observation Shooting crack in wind loaded area Public
12/05/2019 - 12:00 Grouse Rock West Shore Area Avalanche Observation Public
01/18/2020 - 14:00 N side of Round Top Carson Pass Area Avalanche Observation Public
12/24/2019 - 10:00 Mt. Judah Donner Summit Area Snowpack Observation Moderate Sw winds transporting new snow Public
02/07/2020 - 17:15 Castle Peak Donner Summit Area Avalanche Observation Public
03/07/2020 - 20:00 Blue Lakes Carson Pass Area Snowpack Observation Public
01/19/2020 - 15:45 Backside Donner Ski Ranch Donner Summit Area Snowpack Observation Public
03/18/2020 - 04:30 Zone between Granite Lake and Upper Blue Lake Carson Pass Area Snowpack Observation Dug pit down to depth of 158cm looking for weak faceted layer. Bottom of snowdepth was 320cm. Public
01/20/2020 - 13:45 Donner Ridge Donner Summit Area Snowpack Observation Public
03/19/2020 - 10:00 Donner Summit Donner Summit Area Avalanche Observation sheltered  N aspect small surface hoar and settlement ring settlement cracking moderate to large cornice with widespread sloughing beneath skier triggered mid slope D1 release on NE aspect two side by side skier triggered D1 releases NE aspect afternoon rollerballs at lower elevations Public
12/29/2019 - 10:30 NE Ridge of Silver Peak Snowpack Observation Evidence of small windslabs on N facing terrain, leeward to SW winds Evidence of small windslabs on N facing terrain, leeward to SW winds

Wind Transport on NE Ridge of Silver Peak (12-29-19)

04/04/2020 - 22:00 Frog Lake Cliffs Donner Summit Area Avalanche Observation Public


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