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
01/18/2019 - 11:00 Near Frog Lake Carson Pass Area Snowpack Observation Settlement cone present first thing in the morning. Crown from a natural avalanche during storm. Several cornices were pulling away and revealing cracks. Down 70 cms adjacent to the old crown, 5-10mm surface hoar crystals. Around noon a wet fog rolled through coating everything in rain droplets. Professional Observer
12/10/2018 - 11:00 Maggie's Peak Desolation Wilderness Area (including Emerald Bay) Snowpack Observation Open area at 8400 feet on ridge between Maggie's Peaks showing NSFs but no Surface Hoar. Professional Observer
02/08/2019 - 13:00 Tallac Desolation Wilderness Area (including Emerald Bay) Avalanche Observation Public
01/03/2019 - 10:00 Angora Peak Desolation Wilderness Area (including Emerald Bay) Snowpack Observation Public
02/11/2019 - 12:30 Tallac Corkscrew Desolation Wilderness Area (including Emerald Bay) Snowpack Observation Public
12/09/2018 - 14:00 Mt. Tallac Desolation Wilderness Area (including Emerald Bay) Avalanche Observation Forecaster
12/31/2018 - 12:00 Mt Tallac Desolation Wilderness Area (including Emerald Bay) Snowpack Observation Professional Observer
02/08/2019 - 11:45 tallac Desolation Wilderness Area (including Emerald Bay) Avalanche Observation Public
12/10/2018 - 11:45 N End of Janine's Ridge Desolation Wilderness Area (including Emerald Bay) Snowpack Observation 5cm Windslab Public
02/08/2019 - 11:00 Mt. Tallac Desolation Wilderness Area (including Emerald Bay) Snowpack Observation Public
01/30/2019 - 12:00 Angora Peak Desolation Wilderness Area (including Emerald Bay) Snowpack Observation Professional Observer
02/19/2019 - 11:15 North shoulder of Judah Donner Summit Area Snowpack Observation Shooting crack in a small windslab Guide
Alpenglow Expeditions
12/15/2018 - 14:00 Castle Pass Donner Summit Area Snowpack Observation Public
11/29/2018 - 11:30 Castle Peak Donner Summit Area Snowpack Observation High intensity wind loading at ridge top above treeline. High intensity wind loading at ridge top above treeline. Minor skier triggered cracking of newly formed wind slabs. 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

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