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
11/29/2018 - 10:15 Andesite Peak Donner Summit Area Avalanche Observation Forecaster
12/03/2018 - 13:00 Rubicon peak West Shore Area Snowpack Observation Surface hoar around 7600ft/ NE Looking west into desolation Guide
Tahoe Mountain School
12/07/2018 - 12:00 West Grouse Blackwood Canyon or Ward Canyon Area Snowpack Observation SE aspect below Grouse Rock. 10cm artificial slab created PST 20/100 end on 12/4 SH layer. New surface hoar of 5 to 10 cm seen in West Grouse area. Forecaster
12/11/2018 - 12:00 Thunder Mountain Carson Pass Area Snowpack Observation Professional Observer
12/15/2018 - 14:15 Johnson Canyon Donner Summit Area Snowpack Observation Educator
Tahoe Mountain School
12/19/2018 - 11:30 Ellis Peak Blackwood Canyon or Ward Canyon Area Avalanche Observation Intentionally triggered wind slab avalanche, D1. Another photo of same avalanche. Forecaster
12/24/2018 - 11:30 Tamarack Peak Mount Rose Area Snowpack Observation Stormy conditions at Tamarack. Skier triggered crack on a small wind loaded test slope. New wind slab on top of older hard wind slab on top of old weak surface snow. 3 inches of snow on the hood of the truck after we returned from the tour. Forecaster
12/29/2018 - 11:45 Upper Cold Stream Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation Photo 1: Looking to the west at NE-E aspect near and above treeline terrain along the Sierra Crest, wind scoured snow surfaces and icy crusts were obvious. Forecaster
01/06/2019 - 12:00 Andesite Peak Donner Summit Area Avalanche Observation One of the skier triggered wind slabs near the top of Andesite Peak Small wind slab failure on a test slope. A second ski kick at the spot just after the photo was taken triggered a large whumpf. Skier triggered D1 wind slab avalanche on NE aspect at 8000'.  50' wide x 70' long. Another small D1 skier triggered avalanche in similar terrain. Cracking started at the trailhead 8 inches of new snow acculumated at the trailhead while we were out. My pole is pushed into the level of our skin track when we started the day. Forecaster
01/08/2019 - 09:15 Red Lake Carson Pass Area Snowpack Observation Public
01/11/2019 - 10:30 Bronco Chutes Mount Rose Area Snowpack Observation Public
01/15/2019 - 12:00 Mt. Rose Mount Rose Area Snowpack Observation Surface hoar buried under ~2-3 cm (~1 inch) of new snow. Small failure on a wind-loaded test slope that we think failed on the buried Surface Hoar. Forecaster
01/17/2019 - 11:00 Johnson Canyon Donner Summit Area Snowpack Observation Cornice collapse and wind slab avalanche. Shooting crack around rock following collapse with whumpf. Whumpf triggered by skier at that location. Frozen rain on tree branch. Forecaster
01/21/2019 - 10:45 Powderhouse Peak Luther Pass Area (including Job and Freel) Snowpack Observation Minimal signs of settlement, just a few cracks around trees. Widespread sastrugi in top 200-300 feet of elevation above and below tree line. Above tree line small test slopes showed moderate crack propagation. Small wind slab. Professional Observer
01/22/2019 - 22:00 Flagpole Peak Echo Summit Area Avalanche Observation Public


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