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
02/07/2018 - 10:49 Cathedral bowl Desolation Wilderness Area (including Emerald Bay) Snowpack Observation Guide
Tahoe Mountain School
02/07/2018 - 10:35 Lincoln Valley Yuba Pass Area Snowpack Observation Thin melt-freeze crust on shaded N aspect at ~7,350'.Cold unconsolidated snow under the melt freeze crust on same N aspect at ~7,350'. Forecaster
02/06/2018 - 13:00 Slab Cliffs Mount Rose Area Snowpack Observation Wind scoured exposed NE aspect at 9600 ft. Corn snow conditions on a SW aspect at 9600 ft. Forecaster
02/06/2018 - 11:35 Rubicon Peak and Peak 9,269' West Shore Area Snowpack Observation Coverage on SE aspect of Peak 9269' at 8800'.  Little to no continuous snow below 8200'. Forecaster
02/05/2018 - 12:30 Red Lake Peak Carson Pass Area Snowpack Observation Previous point release loose wet avalanche activity at 9000' on E aspect.Small roller balls on test slope.  E aspect at 11:45am. Forecaster
02/05/2018 - 12:00 W ridge Castle Pk Donner Summit Area Snowpack Observation Educator
Donner Summit Avalanche Seminars
02/04/2018 - 14:00 SW Face of Basin Peak Donner Summit Area Snowpack Observation Educator
Tahoe Mountain School
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
02/04/2018 - 10:00 Incline Peak Mount Rose Area Snowpack Observation Loose wet activity after a ski cut on a south facing test slope at 10am.North facing slopes around 9000 feet were "right side up" down a meter.Almost 170 cms of snow at 9000 feet on north facing slopes.South east face of Incline Peak. Professional Observer
02/03/2018 - 13:30 Underwood Bowl Bear Valley Area Snowpack Observation 2 to 5 cm (1 to 2 in) of corn snow on a S aspect at 3:00 pm.Patchy snow cover on SE-S-SW aspects in the area. Recent cornice collapses and good snow cover on NE aspects.Snow cover on N aspects and lack of snow cover on S aspects in the distance Forecaster
02/03/2018 - 12:00 Red Lake Peak SW Carson Pass Area Snowpack Observation Thin but usable snowcover on SW flank of Red Lake Peak (SE-S-SW aspects)2 inches of surface wet snow. Rain crust below glove providing supportability.Skier triggered roller balls on micro E aspect on gully wall (back of photo). Forecaster
02/02/2018 - 12:30 Fireplug Mount Rose Area Snowpack Observation Small roller balls and pinwheels on a SE aspect at 9100 ft. Forecaster
02/02/2018 - 12:15 N. Ridge of Silver Peak Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation ECTP 29 SP @68 cm Educator
Tahoe Mountain School
02/02/2018 - 10:15 Lincoln Valley Yuba Pass Area Snowpack Observation Recent roller balls created by snow falling from sun exposed trees onto colder shaded N aspect terrain did not produce any degree of loose wet avalanche activity. Forecaster
02/01/2018 - 13:30 Crest above Pole Creek Donner Summit Area Snowpack Observation Old wind slab avalanche above Deep CreekLimited Coverage Near AndersonOld wind slab and cornice debris Guide
Tahoe Mountain School


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