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
04/04/2018 - 12:00 Mt. Houghton Mount Rose Area Snowpack Observation 12:15pm on E aspect at 9400', 4-6'' boot pen. Forecaster
02/03/2016 - 10:00 Andesite Peak Donner Summit Area Snowpack Observation Forecaster
01/05/2018 - 12:00 Red Lake Peak Carson Pass Area Snowpack Observation ECTP's on facet layer buried below slab.Coverage on N side Red Lake PeakSmall roller balls skier triggered. 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
11/16/2017 - 12:00 Tamarack Peak Mount Rose Area Snowpack Observation Skier triggered cracking on a wind-loaded test slope on an E aspect at 9700 ft. Forecaster
01/27/2017 - 12:00 Andesite Ridge Donner Summit Area Snowpack Observation Wind transport and scouring along Andesite RidgeSkier triggered crack on a wind loaded W facing test slopeNatural cracking on a wind loaded W facing test slope Forecaster
11/23/2016 - 15:15 East Ridge of Relay Peak Mount Rose Area Snowpack Observation Forecaster
01/03/2016 - 12:20 Mt. Tallac Desolation Wilderness Area (including Emerald Bay) Snowpack Observation Forecaster
12/16/2016 - 07:00 Bronco Chutes Mount Rose Area Avalanche Observation
Looking up at several crowns that likely happened on 12/16 at the end of the recent storm.
A closer look at some of those crowns.
03/18/2018 - 13:00 Incline Lake Peak Mount Rose Area Snowpack Observation Forecaster
12/06/2017 - 14:30 Andesite Peak Donner Summit Area Snowpack Observation Heavily wind scoured E aspect near summit. No snow remaining for future NE wind transport.2mECTP result along top of old nsf layer. Forecaster
02/19/2016 - 12:30 Castle Peak Donner Summit Area Snowpack Observation Forecaster
01/09/2018 - 02:00 Elephants Hump Carson Pass Area Avalanche Observation
02/04/2018 - 11:00 Kings Realm Bear Valley Area Snowpack Observation Looking at S facing slopes across Mokelumne Canyon. N facing slopes in Kings Realm in the foreground.2 to 5 cm (1 to 2 in) of corn on a S aspect at 8000 ft. by 10:30 amS aspect on the lookers right and N aspect on the left. Photo is from standing at 8000 ft. on the ridge. Forecaster
03/17/2016 - 14:00 Mt. Judah Donner Summit Area Snowpack Observation Forecaster


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