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 button above.
Date and time of observation or avalanche occurrence Location Region Observation Type Photos Snowpack, Avalanche, Weather Videos Snowpit videos (tests, etc) Observation made by
03/16/2020 - 12:00 Andesite Ridge Donner Summit Area Avalanche Observation Ski kick triggered avalanche on a NE-ENE aspect at 7850 ft Same avalanche from the top of the slope. Note the crack on the left flank. Same avalanche from the top of the slope. Note the crack on the right flank. More views of the avalanche. More views of the avalanche The amount of snow that accumulated on the top of the truck during our 4 hr tour Forecaster
03/16/2020 - 12:15 Jakes Peak West Shore Area Avalanche Observation Public
03/16/2020 - 13:00 Rubicon Peak West Shore Area Snowpack Observation Right side up snowpack Public
03/17/2020 - 12:00 Indian Valley Ebbetts Pass Area Snowpack Observation Professional Observer
03/17/2020 - 12:30 Rubicon 8300' ne ridge West Shore Area Snowpack Observation Public
03/17/2020 - 12:30 Hidden Peak West Shore Area Snowpack Observation Skier triggered wind slab on a small NE facing test slope near the top of Hidden Peak Developing breakable crusts on east aspects in the early afternoon. Small snow squalls would blow through occasionally. Forecaster
03/17/2020 - 13:00 Sonora pass Outside of the Forecast Area Avalanche Observation Public
03/17/2020 - 15:30 Serene Lakes Donner Summit Area Snowpack Observation signs of settlement in the new snow filled in skin track...transporting snow small cornice drop with no cracking or any real action underneath NNE 7280' HS 310cm HN 168cm, rightside up, no obvious or reactive layers in the new snow, most reactive layer is a thin and obvious layer of graupel on the old new snow interface while hard to trigger, DT22, this thin layer of graupel broke cleanly on the old/new snow interface Public
03/18/2020 - 01:00 North bowl. Tallac Avalanche Observation Public
03/18/2020 - 04:30 Zone between Granite Lake and Upper Blue Lake Carson Pass Area Snowpack Observation Dug pit down to depth of 158cm looking for weak faceted layer. Bottom of snowdepth was 320cm. Public
03/18/2020 - 10:00 Tamarak/Fireplug Mount Rose Area Snowpack Observation Skin track that was rapidly covered by wind blown snow after our first descent. Public
03/18/2020 - 11:00 Martis Peak Avalanche Observation The whole path from crown to debris Looking up at the avalanche crown Avalanche crown at the left side Left flank of the avalanche Right flank of the avalnache Cracks on lower angle terrain adjacent to the right side of the crown. Cracks on a adjacent lower angle slope around a small ridge Looking up from the toe of the debris with a person for scale. Forecaster
03/18/2020 - 12:00 Incline Lake Peak Mount Rose Area Snowpack Observation Large cornices near the top of Incline Lake Peak Cracking on a small wind-loaded slope near the ridge Snowy weather and limited visibility during the tour. Forecaster
03/18/2020 - 12:45 Frog Lake Carson Pass Area Snowpack Observation Unconsolidated powder on a sheltered north slope. This east facing cornice broke wider than I expected (and wider than I could capture with this photo). Clouds moved in and out most of the day. The top of that property is 340 cms. I measured up to 360 cms of snow in this location. PST 60/160 END down 150 There's a ton of snow on top of this weak layer, but it's still sugar. Professional Observer
03/18/2020 - 14:00 North Ridge of Echo Peak Echo Summit Area Snowpack Observation Public


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