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 Videos Observation made by
01/03/2017 - 13:15 Andesite Peak Donner Summit Area Snowpack Observation Pointing at the old/new snow interface.Pointing at facets near the Dec 15 rain crust. Forecaster
01/29/2018 - 11:45 Ophir Peak Mount Rose Area Snowpack Observation Small surface roller balls on northerly aspects, below 9000', in below treeline terrain.  Some of these were from yesterday.More surface roller balls below 8500' on northerly aspects. Forecaster
12/12/2015 - 09:00 NE of Radio Towers Mount Rose Area Snowpack Observation Public
01/12/2017 - 12:30 Wildflower Ridge Donner Summit Area Snowpack Observation Fairly large sections of cornice along the ridge.Small loose dry triggered by intentional cornice collapse. Forecaster
02/11/2018 - 11:45 Castle Valley Donner Summit Area Snowpack Observation Educator
Tahoe Mountain School
12/21/2015 - 15:00 Powderhouse Peak Luther Pass Area (including Job and Freel) Snowpack Observation Professional Observer
01/01/2016 - 11:00 Ginny Lake Mount Rose Area Snowpack Observation Forecaster
01/29/2017 - 10:00 Negro Canyon Donner Summit Area Snowpack Observation Melting/ free water dripping cornice on SE aspect at 7,500' at 9:45am.Rapidly melting sun crust on SE aspect at 7,500' at 9:45am.Human triggered rollerballs on E aspect at 7,640' at 10am. Forecaster
01/08/2016 - 16:00 Jakes Peak West Shore Area Snowpack Observation Forecaster
01/15/2016 - 12:30 Hidden Peak West Shore Area Snowpack Observation Forecaster
02/18/2017 - 12:00 Elephant's Graveyard Carson Pass Area Snowpack Observation Professional Observer
01/22/2016 - 13:30 West Fireplug Mount Rose Area Snowpack Observation Forecaster
02/23/2017 - 14:30 E end Boreal Ridge south of I-80 rest area Donner Summit Area Snowpack Observation Guide
Donner Summit Avalanche Seminars
01/31/2016 - 11:15 Castle Peak/Andesite Ridge Donner Summit Area Snowpack Observation Forecaster
03/03/2017 - 12:00 Castle Peak - North Bowl Donner Summit Area Snowpack Observation Some cracking on a slope undercut by my skin track. Forecaster

Pages

Subscribe to Central Sierra Nevada / Lake Tahoe Snowpack, Weather, and Avalanche Observations for California and Nevada from SAC