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
03/04/2019 - 12:00 Becker Ridge Echo Summit Area Avalanche Observation Loose wet avalanches occurring yesterday during rapid warming conditions near Hwy 50 below Echo Pass. Loose wet activity from yesterday on Ralston Peak Loose wet activity from yesterday off of Becker Ridge. Forecaster
02/19/2019 - 13:30 Donner Summit Donner Summit Area Snowpack Observation Skier triggered shooting crack on a low angle W aspect Skier cracking on a low angle slope wind-loaded by NE winds and previously undercut by the skin track. Variable wind scoured surfaces with exposed rain crust in some areas. Large surface hoar that was laying flat on many sheltered N-NE-E aspects. Forecaster
03/08/2019 - 11:15 Lincoln Ridge Yuba Pass Area Snowpack Observation One of many large cornices in this area. Sustained moderate to intense blowing snow on the ridgetop. Forecaster
12/26/2018 - 12:15 Deep Creek Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation No signs of wind effect in open areas below treeline, ~7,900 N aspect'. Minimal signs of wind effect from NE winds on ridgetop at ~8,000'. F hard surface snow with micro-sastrugi. Some exposed rain crust just visible reflecting on the cornice top in upper Pole Creek. Forecaster
01/20/2019 - 11:30 Carson Pass Carson Pass Area Snowpack Observation Scoured surfaces on the windward aspects. A mix of new snow on crusts and exposed crusts on leeward slopes. Forecaster
12/09/2018 - 12:00 East Ridge Tamarack Peak Mount Rose Area Snowpack Observation Surface hoar failing on an artificially loaded PST. Crusts on windward slopes preventing wind transport of snow with moderate SW winds. Windward SE-S-SW aspects have limited snow in this area. Forecaster
01/08/2019 - 11:00 Needle Peak Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation Minor cornice cracking Weak layer underneath a windslab Wind slab avalanche (~48hrs old) Guide
Alpenglow Expeditions
01/18/2019 - 10:15 Shirley Canyon Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation Minor wind slab cracking Large cornice drop, no slab failure Early stage settlement ring Roller Balls Profile Guide
Alpenglow Expeditions
02/07/2019 - 14:00 Mt. Judah Donner Summit Area Snowpack Observation Surface hoar varied from 3 to 10mm in size on multiple aspects and elevations. Wind textured snow on the top 50' of Mt. Judah from recent NW-NE winds. Guide
Tahoe Mountain School
02/09/2019 - 13:15 Round Valley Bear Valley Area Avalanche Observation Guide
California Ski Guides
01/09/2019 - 12:00 Wildflower Ridge Donner Summit Area Snowpack Observation ECTN's in recent storm snow with no results on old faceted layer. Guide
Tahoe Mountain School
01/19/2019 - 11:15 Chief Creek drainage Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation buried surface hoar propagation saw test (pst 20/130 end) Snowpack settlement


Alpenglow Expeditions
02/10/2019 - 14:00 Poison Canyon Bear Valley Area Snowpack Observation Guide
California Ski Guides
03/16/2019 - 13:00 Johnson Canyon West Face Donner Summit Area Avalanche Observation Guide
Alpine Skills International (ASI)
02/14/2019 - 13:15 Grouse rock Blackwood Canyon or Ward Canyon Area Snowpack Observation Rain runnels / S5 snowfall 15cm of new snow on top of rain crust/rain saturated snow grains Skin track filled in after 45 mintues Guide
Tahoe Mountain School


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