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 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
03/01/2018 - 15:30 Relay Peak Mount Rose Area Avalanche Observation Public
03/01/2018 - 11:15 Andesite Peak Donner Summit Area Avalanche Observation Small natural storm slab. Small storm slab triggered from below. Wind slab failure on a test slope caused by the natural collapse of a cornice. 1 to 2 foot deep wind slabs failing on the old/new interface on a near treeline wind loaded slope. Triggered from lower angle terrain above the slope. Wind slabs avalanche triggered from the ridge. The avalanche also caused the lower angle slope next to it to shatter but the snow did not slide downhill on the lower angle slope. Shooting crack from lower angle terrain that then becomes a wind slab avalanche in the nearby steeper terrain. Forecaster
03/01/2018 - 01:30 Tamarack Peak Mount Rose Area Snowpack Observation 20'' of heavier storm snow over lighter density snow causing storm slab conditions. Large cracking around skis in BTL terrain with a density change from the heavier storm snow over lighter density old snow. New snow fell as graupel throughout the mid day. Forecaster
02/28/2018 - 10:30 Tamarack Peak Mount Rose Area Snowpack Observation Public
02/28/2018 - 10:30 Incline Lake Peak Mount Rose Area Snowpack Observation Slab of recent storm snow layered F, 4F, 1F on to top of F+ facets. Forecaster
02/28/2018 - 09:30 Powderhouse Luther Pass Area (including Job and Freel) Snowpack Observation facets at 35cm depth facets below crust at 70cm depth fresh snow, barely cohesive. Surface hoar - present across the mountain Public
02/27/2018 - 14:15 Between Castle Pass and Round Valley Donner Summit Area Snowpack Observation Guide
Tahoe Mountain School
02/27/2018 - 13:15 Elephants back Carson Pass Area Avalanche Observation Public
02/27/2018 - 12:00 North trees of Granite Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation Surface hoar, NW aspect, 8300' Surface hoar, NW aspect, 8300' Guide
Alpenglow Expeditions
02/27/2018 - 10:00 South side of Grouse Rock Blackwood Canyon or Ward Canyon Area Snowpack Observation Blowing snow just above treeline loading onto a W aspect. Skier triggered cracking of wind slab formed on Feb 26 (Monday) at treeline on a NE aspect. Skin track refill after ~1 hour. This was of interest due to the well below treeline location on a NE aspect. Forecaster
02/27/2018 - 09:30 South side of Castle Donner Summit Area Avalanche Observation Uphill side of avalanche Lower section and skier Shooting crack in trees Guide
Alpenglow Expeditions
02/26/2018 - 17:00 Relay Peak Mount Rose Area Snowpack Observation Facets down 55cm Public
02/26/2018 - 12:30 Andesite Peak Donner Summit Area Snowpack Observation Cracking along ridge line Steep below tree line test slope displayed minimal cohesion in response to kicking. Guide
Tahoe Mountain School
02/26/2018 - 12:00 East Ridge Tamarack Peak Mount Rose Area Avalanche Observation Skier triggered small wind slab from cornice kick.  Easy to trigger but limited propagation. Shooting cracks and slab release in wind loaded terrain off of ridgeline. Small natural wind slab avalanche, N aspect, 9300', 40 degree slope. Forecaster
02/26/2018 - 11:00 lower Andesite Donner Summit Area Avalanche Observation Avalanche crown and start zone Looking down on the slide. Skiers left flank is out of frame. Professional Observer


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