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
12/03/2018 - 12:30 Mt. Judah Donner Summit Area Snowpack Observation 10 - 15 mm surface hoar was widespread in the Mt. Judah area. IT did start to melt some on slopes with direct sun-exposure later in the day. Cornice pieces and loose dry surface hoar sluffs on Wild Flower Ridge. Cloud cover rolling into the area in the afternoon. Forecaster
12/08/2018 - 14:15 Johnson Canyon Donner Summit Area Snowpack Observation Visual outline of the snowpack on NE Aspect @ 7300' 2-4mm Surface Hoar, these grains seemed to have some sort of icey deposit on them Side profile of current Surface Hoar Cornice cuts produced small loose dry avalanches Educator
Tahoe Mountain School
12/13/2018 - 12:00 Johnson Canyon Donner Summit Area Snowpack Observation Near surface facets on ENE aspect at about 7,200'. S aspect surface wet snow. Forming melt freeze surface crust on flat terrain at 7,600'. Forecaster
12/16/2018 - 16:30 Below Tamarack Peak Mount Rose Area Snowpack Observation Educator
Tahoe Mountain School
12/20/2018 - 12:00 Shirley Canyon Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation New Cornice In Shirley Canyon Guide
Alpenglow Expeditions
12/25/2018 - 03:00 Fireplug Mount Rose Area Snowpack Observation Public
12/30/2018 - 12:30 Tamarack Peak Mount Rose Area Snowpack Observation Exposed dirt and Knife hard sastrugi on Hour Glass Educator
Tahoe Mountain School
01/07/2019 - 10:00 Trimmer Peak Luther Pass Area (including Job and Freel) Snowpack Observation ECTP14 at buried facet layer facets under about 40cm of new snow on E aspect at 8000' large roller balls on E aspect with warm/wet new snow Public
01/08/2019 - 12:00 Squaw Ridge Carson Pass Area Snowpack Observation Professional Observer
01/12/2019 - 12:45 Mt. Rose Mount Rose Area Snowpack Observation Public
01/15/2019 - 13:00 Scott Creek Blackwood Canyon or Ward Canyon Area Snowpack Observation Professional Observer
01/16/2019 - 13:00 near Frog Lake Carson Pass Area Avalanche Observation Crown at midpoint of avalanche. Lowest portion of the debris. Looking up towards the start zone. Snow pushed up against tree by slide. Looking down from where the cornice broke that triggered this slide. Profile of avalanche crown. Facets are by fingers of glove. Shovel blade is roughly at bed surface. Professional Observer
01/21/2019 - 15:30 Mt. Rose proper (not the ski area) Mount Rose Area Avalanche Observation Public
01/27/2019 - 11:30 Mt. Judah Snowpack Observation Small skier-triggered rollerballs and pinwheels on a S facing slope @ 11:45 am. Large crevasse formed as the cornice pulls away from the ridge during the warm weather. Variable firm surfaces on exposed N-NE aspects due to wind scouring. Forecaster
02/01/2019 - 11:30 Becker Peak Echo Summit Area Snowpack Observation Public


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