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
03/06/2018 - 12:00 Elephants Hump Carson Pass Area Snowpack Observation Deep fractures on ENE portion of slope. Deep fractures on NE portion of slope. Boot pack is out of view to the left. Boot pack area, likely trigger. A few small cracks visible on upper right side. Facets from the weak layer in the snowpit. Forecaster
03/06/2018 - 10:15 W side Castle Pk Donner Summit Area Snowpack Observation Educator
Donner Summit Avalanche Seminars
03/05/2018 - 14:15 Tram Ridge, Shirley Canyon Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation facets in Shirley Canyon Guide
Alpenglow Expeditions
03/05/2018 - 13:00 Incline Lake Peak Mount Rose Area Snowpack Observation Minimal roller ball activity on E aspect, 9500', by early afternoon. Forecaster
03/05/2018 - 09:45 Andesite Peak Donner Summit Area Snowpack Observation Guide
Donner Summit Avalanche Seminars
03/04/2018 - 19:00 About 100 feet down from the bowl at the top of ‘elevens’ on Trimmer Luther Pass Area (including Job and Freel) Avalanche Observation Public
03/04/2018 - 15:00 Frog Lake Carson Pass Area Snowpack Observation 270 cm total snow height at this location. Buried near surface facets down 125 cms. Deep tap test. DTM13 on buried NSFs. Large crack behind where a cornice had partially broken away. This was covered by snow. Professional Observer
03/04/2018 - 14:30 Pole Creek Cabin Creek, Deep Creek, or Pole Creek Area Avalanche Observation Deep Slab avalanche viewed from Helicopter Guide
Alpenglow Expeditions
03/04/2018 - 13:15 National Geographic Bowl, Granite Chief Peak Cabin Creek, Deep Creek, or Pole Creek Area Avalanche Observation Large deep slab that failed during the storm Shooting crack Guide
Alpenglow Expeditions
03/04/2018 - 12:30 Tour on Rubicon Peak West Shore Area Snowpack Observation Public
03/04/2018 - 12:15 Trimmer Peak Echo Summit Area Avalanche Observation Public
03/04/2018 - 12:00 Twin lakes/Lost Lakes Carson Pass Area Avalanche Observation Public
03/04/2018 - 12:00 Jakes Peak West Shore Area Avalanche Observation Looking down slope from the right flank of crown. Part of the crown. Crown line. Forecaster
03/04/2018 - 11:15 Negro Canyon Donner Summit Area Avalanche Observation Looking up at the crown of the deep slab, left flank. Debris in the trees from the deep slab. Shooting cracks connecting to lower angle terrain. Climber's right end of crown with debris. Avalanche debris Crack in partially excavated pit immeadiately after weak layer collapsed. Photo taken from triggering snowpit location. These cracks ran 500' over to steeper terrain where it remotely triggered this avalanche beyond the view of this photo.  Shooting cracks continued and went a total of 1000' away from this spot into lower angle terrain on the other side of the avalanche. Digging out one of the cracks-see attached snowprofile.  Crack was 153cm deep down to the facet layer. Forecaster
03/04/2018 - 11:00 Mt. Tallac Desolation Wilderness Area (including Emerald Bay) Avalanche Observation Public


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