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
02/19/2020 - 13:00 Squaw Ridge Carson Pass Area Snowpack Observation Professional Observer
02/19/2020 - 12:00 Castle Peak Donner Summit Area Snowpack Observation 3 cm of corn on top of a P to I hard surface melt-freeze layer over 15 cm thick. Decent snowcover holding on S to SW aspects of Castle Peak. Forecaster
02/18/2020 - 12:00 Silver Peak Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation Tiny areas of wind drifted snow up to 0.5 inches deep from recent SW wind event. Upper snowpack breakable crust and facets on below treeline N aspects. Forecaster
02/17/2020 - 15:00 Mt. Judah Donner Summit Area Snowpack Observation Firm variable surfaces on northerly aspects Firm melt-freeze conditions on a WNW aspect Shallow corn snow on a W aspect at 8000 ft. Breakable crust with soft weak snow below it on a north aspect. Wind scoured scalloped firm snow on an E-NE aspect. Forecaster
02/17/2020 - 12:15 Relay peak Mount Rose Area Snowpack Observation Breakable crust, sastrugi, wind blown snow and near surface facets Reverse tracks Public
02/17/2020 - 10:00 Mt Tallac Desolation Wilderness Area (including Emerald Bay) Snowpack Observation Public
02/16/2020 - 12:15 Rose Knob Mount Rose Area Snowpack Observation Warm temperatures with some clouds, but plenty of sun. Snow coverage below 7800' getting thin on solar aspects. Forecaster
02/16/2020 - 09:15 Monument Creek Drainage East Shore Area Snowpack Observation Public
02/16/2020 - 09:00 Tamarack peak east side Mount Rose Area Snowpack Observation Public
02/15/2020 - 15:00 Castle Peak Donner Summit Area Snowpack Observation Periods of cloud cover like this move through the area today 5-8 cm of corn snow on a supportable base on a SW aspect at 2:30 pm Debris on the snow surface in the trees Variable and crusty surfaces on northerly aspects below treeline Forecaster
02/15/2020 - 12:00 Mt Tallac West Shore Area Snowpack Observation Cathedral bowl Nice corn run SE aspect @ noon Public
02/14/2020 - 13:00 Johnson Canyon Donner Summit Area Snowpack Observation Snow coverage was patchy on W and SW aspects below 6800 ft. Shallow corn conditions (~2 cm or 1 in of soft wet snow on a supportable frozen base) existed on W and SW aspects as of 1 pm. W and WSW aspects still have decent coverage above 6800 ft. SSW aspects are melting fast. Forecaster
02/14/2020 - 12:00 Silver Peak Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation Thick high level cloud cover over Silver Peak from 9am to 10:30am. Cloud cover rapidly cleared with full sun at 11am. Forecaster
02/14/2020 - 10:15 Emerald Bay Chutes West Shore Area Snowpack Observation My line was climbers right of the prominent rock ridge, in the center of the photo Large grained granular snow on a supportable base found low in path Variable conditions found in the upper portion of the path Public
02/13/2020 - 13:30 Just North of Incline Lake Mount Rose Area Snowpack Observation Public


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