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. This program is available as a free download at http://www.snowpilot.org/. A video on how to download and use this program is available here. Please send us your observations using the buttons below.

Location Region Observation Type Date and time of observation or avalanche occurrence Avalanche observation video Avalanche photos Snowpit videos (tests, etc) Snowpack photos Snowpit or crown profile photo or graph Observation made by
Relay Peak Mount Rose Area Snowpack Observation 03/18/2017 - 14:00 Public
Red Lake Peak Carson Pass Area Snowpack Observation 03/18/2017 - 11:30 Looking north along the Sierra Crest - note the more widespread cloud cover north of Emerald Bay Cracks near the edge of a small cornice and an older cornice collapse Forecaster
Prosser Hill Donner Summit Area Snowpack Observation 03/17/2017 - 12:00 Knee deep wet snow on a S aspect at 6900 ft. at noon. Forecaster
Rose Knob Mount Rose Area Snowpack Observation 03/17/2017 - 12:00 Below 8200' on E-SE-S aspects were unsupportable, wet, and sticky snow at 12noon. Sagging cornices have opened up large, deep cracks between cornice and ridgeline.. Forecaster
Echo Peak Echo Summit Area Snowpack Observation 03/17/2017 - 10:00 Just after 8:00am, at 6800 feet open east facing slopes had a solid surface freeze. Around 9:00am, north facing partially open slopes had slick but shallow surface freeze with soft snow below. Huge crevasse where the east facing slope meets the flat ridge. Around 9:30am, on east facing slopes at 8600 feet snow was already softening. Around 10:00am, at 6800 feet open east facing slopes were softening significantly. Large amounts of running water at 8:00am in open areas. Professional Observer
Twin Crags Sawtooth Ridge to Tahoe City Snowpack Observation 03/16/2017 - 12:00 Loose wet sluff triggered by a ski cut on a S aspect at 6900 ft. @ noon. More ski cut triggered loose wet sluffs on a S aspect test slope. Mid shin deep wet snow on a S aspect at 6600 ft. at 10:30 am. Forecaster
Mt. Tallac Desolation Wilderness Area (including Emerald Bay) Snowpack Observation 03/16/2017 - 12:00 Below 7500', unsupportable knee deep snow. Sagging cornices with debris from recent cornice failures widespread. Looking downslope on E-SE aspect, 8000'. Forecaster
Black Wall Area - Donner Summit Donner Summit Area Snowpack Observation 03/15/2017 - 12:00 Shin deep boot penetration into wet snow on a SE aspect at 7100 ft. Cornice failure that caused a small loose wet avalanche on an E aspect at 7200 ft. Likely occurred within the last 48 hours. Forecaster
Donner Peak Donner Summit Area Avalanche Observation 03/15/2017 - 11:47 Loose wet avalanche size D2 triggered by natural cornice collapse.Loose wet avalanche size D2 triggered by natural cornice collapse. Forecaster
Below Eagle Buttress Desolation Wilderness Area (including Emerald Bay) Snowpack Observation 03/14/2017 - 13:00 March 14-Glide crack as seen from Emerald Bay March 16-Glide crack as seen from Emerald Bay March 18-Glide crack as seen from Emerald Bay March 23-Glide crack as seen from Emerald Bay post storm. March 28-Glide crack as seen from Emerald Bay - Possibly some recent activity near one of the middle cracks.. April 3-Glide crack as seen from Emerald Bay. April 6-Glide crack as seen from Emerald Bay. Forecaster
West Ridge of Mt. Tallac Desolation Wilderness Area (including Emerald Bay) Avalanche Observation 03/14/2017 - 13:00 Loose wet avalanche size D1.5-D2 triggered by natural cornice collapse. Forecaster
Stevens Peak Carson Pass Area Snowpack Observation 03/14/2017 - 11:15 Shin deep wet snow on an East aspect at about 7700 ft. at 12:00pm 1-2 inches of wet snow on top of a thin but supportable refreeze crust at 9200 ft. on a SE aspect Boot top deep wet snow on an ESE aspect at about 8200 ft. at 10:45 am. Forecaster
South of Frog Lake Cliff Donner Summit Area Avalanche Observation 03/14/2017 - 10:15 Educator
Donner Summit Avalanche Seminars
Andesite Ridge Donner Summit Area Snowpack Observation 03/13/2017 - 13:00 1pm.  Boot top boot pen and full length ski pole pen on S aspects at 7500'. Guide
Tahoe Mountain School
Angora Peak Echo Summit Area Snowpack Observation 03/13/2017 - 11:30 At 9:15 am on a 7800 foot East aspect under dense tree cover, the snow was soft an unfrozen. At 10:20 am on a 8200 foot South East aspect on an open slope, the top 4-6 inches of snow was melted and soft. A slight freeze lingered below that depth. In the same location as Photo 2, more force on the pole could move through the lingering freeze layer and penetrate to deeper unconsolidated snow below. At 10:20 am on 7800 foot South East aspect on an open slope, snow was melted and very soft. Impressively deep holes over creeks in this area. Professional Observer

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