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 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
01/09/2020 - 11:30 Castle Peak/Andesite Peak Donner Summit Area Avalanche Observation New wind slabs failing on Jan 4 crust. Small D1 wind slab on E aspect Shooting cracks in wind loaded terrain Small loose dry sluffing. Low level clouds with periods of very light snow. Forecaster
02/22/2020 - 12:00 Lincoln Ridge Yuba Pass Area Snowpack Observation Diminished coverage on southerly aspects at lower elevations (below 7800 ft) Mostly clear skies in this area and looking to the south. Shallow soft corn snow on a supportable crust by 11 am on sunny slopes Sun/melt sculpting on a sunny SSW aspect near 7700 ft. Breakable crusts with a thin layer of softer/weaker snow below them on northerly aspects Forecaster
04/14/2020 - 12:00 Lincoln Ridge Yuba Pass Area Snowpack Observation Strong and thick mf crust on the surface with some wet snow below on top of the buried surface hoar layer. Previous loose wet roller balls and cornice collapses. Forecaster
01/12/2020 - 15:30 Mt. Judah Donner Summit Area Snowpack Observation Wind blown snow coming over the ridge on a near treeline slope. Cornices building above Wildflower Ridge Forecaster
02/05/2020 - 11:30 Emerald Bay Chutes West Shore Area Snowpack Observation 1-2'' of wet snow on top of a firm supportable crust at 8000'. Thin high clouds for most of the morning hours. Limited snow coverage in these southern gullies. Light amounts of previous wind blown snow just below ridgeline at 9000'. View down the lower gully and moraine features Forecaster
02/10/2020 - 12:15 Mt. Judah Donner Summit Area Snowpack Observation Variable snow surface conditions throughout area. South facing terrain still firm at 12noon with no signs of softening. Large downed tree from the NE wind event yesterday. Forecaster
12/24/2019 - 10:30 National Geographic Bowl Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation Active wind transport on ridgelines. Blowing snow Guide
Alpenglow Expeditions
12/18/2019 - 13:00 Mt. Judah Donner Summit Area Snowpack Observation Guide
Alpenglow Expeditions
01/18/2020 - 13:00 Deep Creek Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation Quick hand pit Guide
Alpenglow Expeditions
01/13/2020 - 12:45 Silver Peak Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation Cracking on an undercut skin track. Guide
Tahoe Mountain School
03/15/2020 - 12:00 Deer Park Five Lakes Area Snowpack Observation Guide
Alpenglow Expeditions
12/05/2019 - 12:15 round top Carson Pass Area Avalanche Observation Round top avalanche, 18 inch crown Crack and crown of wind slab Pre slide Round Top avalanche, two observers bottom left of the chute, rider at trigger point. No one was caught, carried nor injured. Guide
Alpine Skills International (ASI)
12/20/2019 - 11:30 National Geographic Bowl Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation Guide
Alpenglow Expeditions
12/03/2019 - 14:00 Red Lake peak Trailhead Carson Pass Area Snowpack Observation CT RP results Layer ID Snow bombs Sky cover Guide
Alpine Skills International (ASI)
01/08/2020 - 12:00 Mt. Judah Donner Summit Area Avalanche Observation Guide
Alpenglow Expeditions

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