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
12/08/2018 - 11:30 Castle Peak Donner Summit Area Snowpack Observation Extended column test with no failure, Snow pack was 125cm Surface hoar was seen almost everywhere, except for the most sunny areas. Public
12/10/2018 - 11:45 N End of Janine's Ridge Desolation Wilderness Area (including Emerald Bay) Snowpack Observation 5cm Windslab Public
12/14/2018 - 10:30 Anderson Ridge Donner Summit Area Snowpack Observation High winds but minimal local ridge top transport wind scoured and side loading below the ridge thin and non-reactive wind loading at 10:30a Public
12/01/2018 - 12:15 Gareth Feldstein Donner Summit Area Snowpack Observation Wind loading - small cornice 125cm weak top layer roughly 35cm Checking the crust @ 55cm - 30cm Crust @ 55cm Joe - extended column test (Low angle probably prevented negative test results) Wind loading along the ridge-line Lots of wind on the ridge-line Public
12/12/2018 - 12:30 South Ridge Houghton Mount Rose Area Snowpack Observation Public
11/29/2018 - 12:30 Relay Peak Mount Rose Area Avalanche Observation Small windslab along ridge line Public
11/23/2018 - 15:00 Upper Ophir Creek Drainage Mount Rose Area Snowpack Observation Wind slab over storm slab (hand shear) HS 35-55 cm 4f over F Shooting cracks Public
12/17/2018 - 11:45 Mt. Lola Independence Lake Area Snowpack Observation Active wind transport along ridge line @ 8000' Small loose dry avalanche Storm hung up on the HWY49/Yuba river drainage Public
12/03/2018 - 12:00 Jakes Peak West Shore Area Snowpack Observation Public
12/11/2018 - 12:45 Tamarack Peak Mount Rose Area Snowpack Observation Heavy Traffic in the Hourglass Evidence of wind transport and loading in Broken Glass Thin snow cover (40cm) w vegetation showing and sun affected on SE aspect Public
12/15/2018 - 14:00 Castle Pass Donner Summit Area Snowpack Observation Public


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