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
02/24/2018 - 10:00 Incline Lake Peak Mount Rose Area Snowpack Observation Potentially problematic interface of recent storm snow on top of old near surface facets as seen in the pit wall. Newly formed cornices, easy to intentionally collapse onto small test slopes below. Newly formed wind slab fractured by a ski cut on this test slope. Moderate amounts of blowing snow. Forecaster
02/23/2018 - 14:30 Thunder Mountain Carson Pass Area Snowpack Observation Public
02/23/2018 - 12:30 top of NatGeo bowl Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation Guide
Alpenglow Expeditions
02/23/2018 - 12:00 Ebbetts Pass and Hiram Peak Ebbetts Pass Area Snowpack Observation Professional Observer
02/23/2018 - 11:00 Castle Peak Donner Summit Area Snowpack Observation Cornice on the right (E aspect) and wind pillow on the left (W aspect) due to the shift from SW to NE winds. Wind scoured cornices on E aspect between Castle Pass and Castle Pk. Blowing snow along the Castle Pk - Basin Pk ridgeline. No signs of new wind slab formation. Forecaster
02/23/2018 - 09:00 W end Boreal Ridge Donner Summit Area Snowpack Observation Guide
Donner Summit Avalanche Seminars
02/22/2018 - 13:45 Grouse rock Blackwood Canyon or Ward Canyon Area Snowpack Observation Small loose dry avalanche Skin track filled back in - less than 1 hour Guide
Tahoe Mountain School
02/22/2018 - 12:00 Frog Lake Ridge Carson Pass Area Snowpack Observation Professional Observer
02/22/2018 - 11:00 Incline Lake Peak/Slab Cliffs Donner Summit Area Snowpack Observation Forecaster
02/21/2018 - 12:30 Chickadee Ridge Mount Rose Area Snowpack Observation Recent storm snow over poorly developed near surface facets. Forecaster
02/21/2018 - 12:00 Castle Peak/Andesite Peak Donner Summit Area Snowpack Observation Built out cornices just below Castle Peak.  W-NW ridge is scoured to firm crusts with up to 8'' of wind blown snow on leeward side. Exposed SW-W aspects at 8200' on Andesite Peak are well scoured with little to no snow available for transport. Forecaster
02/20/2018 - 13:15 South side of Grouse Rock Blackwood Canyon or Ward Canyon Area Snowpack Observation Wind scoured W aspects. Small skier triggered cornice failure on E aspect with very minor cracking on wind slab below. Forecaster
02/20/2018 - 12:00 Black Butte Carson Pass Area Snowpack Observation Professional Observer
02/19/2018 - 12:00 Tamarack Peak Mount Rose Area Snowpack Observation Small wind slab, 8-10'', on N aspect at 9200' in near treeline terrain.Cornices release onto wind loaded slopes did not result in any wind slab failure.NW/N aspect on Far East Ridge of Tamarack was scoured back to firm crusts with cornice removed by NW winds.Skin track was refilled by wind within 2 hours along ridgeline by NW winds. Forecaster
02/18/2018 - 12:00 Rubicon Peak West Shore Area Snowpack Observation Wind scoured N aspects at 9000'. Forecaster


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