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 Videos Observation made by
01/25/2018 - 11:30 East Ridge Tamarack Peak Mount Rose Area Snowpack Observation Stubburn wind slabs with cracking and shooting cracks in wind loaded terrain. Many large cornice drops on slopes caused shooting cracks but no slab release.  East Ridge of Tamarack.Wind textured surface snow on Far East Ridge.ECTP-29 failing into the old snow.  A layer of F hard snow existed below old surface crust.  9300', N aspect.Avalanche debris from early in the storm almost entirely covered up.  Cornice failure and/or wind slab avalanche release.  9300', N aspect. Forecaster
01/24/2018 - 23:30 Lake of the Woods. Independence Lake Area Avalanche Observation
Digging into the crown to look at the faceted failure layer.
Subtle line of mostly filled in crown visible ~ 10 ft down slope of person in photo.
Looking down the avalanche path.
01/24/2018 - 14:28 Wildflower Ridge Donner Summit Area Snowpack Observation , , , Public
01/24/2018 - 12:00 Rubicon Peak West Shore Area Snowpack Observation Blowing snow below treeline.Blowing snow near summit of Rubicon Peak. Fresh wind slabs below summit pinnacle on E aspect.Signs of small wind slabs forming with redistribution of old snow on the ground.Obvious plumes of blowing snow on Dick's Peak as seen from the saddle on the S side of Rubicon's summit. Forecaster
01/24/2018 - 11:00 Lower Andesite Ridge Donner Summit Area Avalanche Observation
Tahoe Mountain School
01/24/2018 - 08:50 Red Lake peak Carson Pass Area Snowpack Observation Public
01/23/2018 - 15:14 East Lincoln Donner Summit Area Snowpack Observation Public
01/23/2018 - 12:00 Squaw Ridge Carson Pass Area Snowpack Observation Professional Observer
01/23/2018 - 12:00 Silver Peak Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation Visible horizontal line mid sample is the buried surface hoar layer at snowpit location.Windward slopes with up to 6'' of available snow for wind transport tomorrow. Forecaster
01/23/2018 - 11:00 Lincoln Ridge Yuba Pass Area Snowpack Observation False color image showing small skier triggered cracking due to the surface hoar failure in an area where the 4cm of snow above the surface hoar was slightly denser. N aspect 7600 ft. Wind scoured surfaces along the ridgeline at 7800 ft. Forecaster
01/23/2018 - 10:32 meiss Carson Pass Area Snowpack Observation Public
01/22/2018 - 12:00 Castle Pass/Andesite Peak Donner Summit Area Snowpack Observation Educator
Donner Summit Avalanche Seminars
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
01/21/2018 - 16:07 Andesite Peak Donner Summit Area Snowpack Observation Educator
Tahoe Mountain School
01/21/2018 - 13:40 Castle Peak NW Face Donner Summit Area Snowpack Observation , , , Public