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 http://www.snowpilot.org/. 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
03/24/2019 - 12:45 Johnson Canyon Donner Summit Area Snowpack Observation D1 skier triggered loose wet avalanche on east aspect @ 7300ft glide crack near johnson creek widespread surface hoar early AM before solar / warming Educator
Tahoe Mountain School
01/07/2019 - 14:00 Andesite Ridge Donner Summit Area Snowpack Observation Educator
Donner Summit Avalanche Seminars
02/05/2019 - 12:00 Sierra Crest above Bradley Hut Cabin Creek, Deep Creek, or Pole Creek Area Avalanche Observation Educator
Donner Summit Avalanche Seminars
03/16/2019 - 12:15 West face of Johnson canyon Donner Summit Area Snowpack Observation Educator
Alpine Skills International (ASI)
02/08/2019 - 13:00 Donner Summit Donner Summit Area Snowpack Observation Educator
Tahoe Mountain School
01/06/2019 - 12:30 Tamarack Peak Mount Rose Area Snowpack Observation One of many easily triggered windslabs today Shooting cracks were common today Educator
Tahoe Mountain School
02/24/2019 - 12:45 Castle Pass / Andesite peak Donner Summit Area Snowpack Observation kick test on SE aspect off castle pass Educator
Tahoe Mountain School
12/09/2018 - 13:15 E of Boreal ski area Donner Summit Area Snowpack Observation Educator
Donner Summit Avalanche Seminars
01/08/2019 - 15:00 Shirley Canyon Cabin Creek, Deep Creek, or Pole Creek Area Avalanche Observation Educator
Alpenglow Expeditions
03/17/2019 - 11:00 Upper Ginny Lake drainage. Mount Rose Area Snowpack Observation Thin melt freeze crust over dry snow on flat terrain at 8,350'. Thin melt-freeze crust over dry snow on SE aspect at 9,550'. Same thin melt-freeze crust over dry snow on SE aspect at 9,550'. Shallow wet snow over dry snow on SE aspect at 9,600'. Dry snow previously unaffected by melt on NNW-N-NNE aspects above 8,500'. Forecaster
01/14/2019 - 12:00 Johnson Canyon Donner Summit Area Snowpack Observation 10 to 12mm surface hoar in open areas near and below treeline. Forecaster
04/07/2019 - 12:00 Stevens Peak Carson Pass Area Snowpack Observation Mostly sunny skies, warm temps, with thin high cloud cover and strong SW winds. ECTN on wind loaded test slope at 8900', NE aspect.  Roller ball activity along with some small loose wet avalanches. Weak wet snow that failed with a ski turn on lower angle terrain. Forecaster
12/11/2018 - 12:00 Carpenter Ridge Independence Lake Area Snowpack Observation Small wind slab at treeline on NE aspect. Unconsolidated snow along the ridgetop, still available for future wind transport. Forecaster
04/20/2019 - 11:00 Rubicon Peak West Shore Area Snowpack Observation Morning sun prior to about 10:15 am. Wet snow with no refreeze on W aspect at about 7,300'. Thin, breakable surface crust (weak refreeze) on N aspects at 8,100' and above. Increase to 100% cloud cover and snow/rain showers at 10:30 am. Sluffing of wet surface snow on E aspect at 8,000'. Ski cuts on small test slopes showing the presence of the loose wet avalanche problem. Forecaster
03/27/2019 - 14:00 Powderhouse Peak Luther Pass Area (including Job and Freel) Snowpack Observation Blowing snow along the summit ridge of Powderhouse. Shooting crack on a wind-loaded test slope on @ 9100 ft. on Powderhouse Smal ski cut triggered wind slab on a test slope on Powderhouse Peak. A lull in the storm over Luther Pass between 1 pm and 3 pm today. Forecaster

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