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
11/28/2018 - 12:00 NW Castle Peak Donner Summit Area Snowpack Observation Light wind loading occurring off of summit ridge with cornice development. Wind loaded pillows showed minor cracking.  Forecaster
02/09/2019 - 12:30 Shirley Canyon Cabin Creek, Deep Creek, or Pole Creek Area Avalanche Observation Low vis photo of shooting cracks and small wind slab avalanche, skier triggered Guide
Alpenglow Expeditions
12/18/2018 - 10:15 Shirley Canyon Cabin Creek, Deep Creek, or Pole Creek Area Avalanche Observation Shooting Crack Small windslab avalanche Guide
Alpenglow Expeditions
12/20/2018 - 12:00 Shirley Canyon Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation New Cornice In Shirley Canyon Guide
Alpenglow Expeditions
01/13/2019 - 11:30 Needle Peak area Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation Cornice collapse and wind scour Surface hoar

ECTP17

Guide
Alpenglow Expeditions
12/22/2018 - 15:00 Shirley Canyon Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation Guide
Alpenglow Expeditions
12/24/2018 - 11:00 Donner Pass Donner Summit Area Snowpack Observation Guide
Tahoe Mountain School
01/06/2019 - 13:15 Summit Ridge Poison Peak Bear Valley Area Snowpack Observation Guide
California Ski Guides
02/10/2019 - 13:15 Below Poulsen's Peak, Olympic Valley Sawtooth Ridge to Tahoe City Snowpack Observation Guide
Alpenglow Expeditions
12/16/2018 - 11:45 Castle Peak Donner Summit Area Snowpack Observation Wind Transport on Castle Ridge Guide
Tahoe Mountain School
02/03/2019 - 13:00 Shirley Canyon Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation Moderate cracking in wind lip in open below-treeline terrain, 7000'. Small 6-8" deep wind slab failed on test slope, NE aspect at 7000'. Guide
Alpenglow Expeditions
01/23/2019 - 13:30 Castle Peak Donner Summit Area Avalanche Observation Small loose wet avalanches on south side castle peak Guide
Tahoe Mountain School
02/09/2019 - 13:15 Round Valley Bear Valley Area Avalanche Observation Guide
California Ski Guides
03/14/2019 - 15:30 Peter Leh Donner Summit Area Snowpack Observation Guide
Alpine Skills International (ASI)
12/03/2018 - 13:00 Rubicon peak West Shore Area Snowpack Observation Surface hoar around 7600ft/ NE Looking west into desolation Guide
Tahoe Mountain School

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