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
02/24/2019 - 12:00 Castle Peak, NW Donner Summit Area Avalanche Observation Public
01/11/2019 - 11:45 Little Alaska, Ward Canyon, Lake Tahoe Blackwood Canyon or Ward Canyon Area Snowpack Observation Location where large, overhanging cornice broke off today. Public
03/10/2019 - 12:00 Ralston Peak Desolation Wilderness Area (including Emerald Bay) Snowpack Observation Public
01/15/2019 - 08:00 Jake's Peak West Shore Area Snowpack Observation A view of the pit with distinct layers. Snow fall rates picked up to S1 or S2 as we continued to ascend. Minor surface instabilities/slough (NSF and new snow) were easy to trigger in steeper terrain. Public
02/03/2019 - 13:45 Bear Valley Via Meadow Lake Rd Independence Lake Area Snowpack Observation Public
03/04/2019 - 11:00 Red lk pk Carson Pass Area Avalanche Observation Public
03/12/2019 - 12:15 South side of Jakes West Shore Area Snowpack Observation Public
11/29/2018 - 08:00 Tamarack Peak Mount Rose Area Snowpack Observation Public
02/19/2019 - 13:45 Trimmer Peak Luther Pass Area (including Job and Freel) Snowpack Observation Public
02/07/2019 - 08:00 Shirley Canyon Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation Surface hoar developing on north facing aspect at ~7500' Public
12/19/2018 - 10:30 Rubicon Peak West Shore Area Snowpack Observation Shooting Cracks in Wind loaded area Near Treeline Public
03/08/2019 - 12:30 Andesite Ridge Donner Summit Area Snowpack Observation Public
03/17/2019 - 14:45 Donner Lake Run above Conifer Drive Donner Summit Area Avalanche Observation Public
03/19/2019 - 11:00 Donner Summit Donner Summit Area Snowpack Observation Photo of the compression test failure we saw in the artificially loaded tests on a shade N aspect. Public
01/22/2019 - 09:15 The 11s - Trimmer Peak Snowpack Observation Graupel on the surface of my skis Graupel can be seen piled up by the wind on an exposed ridge E-NE wind transporting snow over the false summit of Trimmer Peak Minor settlement found around some trees Cracking of windslabs was isolated and small Public


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