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 Snowpack, Avalanche, Weather Videos Snowpit videos (tests, etc) Observation made by
12/18/2017 - 12:45 Ophir Peak Mount Rose Area Snowpack Observation Minor wind scouring on the top 100' of peak.  Large boulders and trees still poking out of snowpack. Forecaster
03/21/2016 - 12:30 Tamarack Peak Mount Rose Area Snowpack Observation Forecaster
11/27/2016 - 12:00 Castle Peak Donner Summit Area Snowpack Observation Forecaster
03/13/2017 - 11:00 Silver Peak Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation Runnels creating less than smooth snow surfaces on ESE aspects (photo left), transitioning to smooth on NE aspects (photo right).Decent supportability in open areas at 9:45am.Cracking of weak melt freeze crust on nil aspect under forest canopy.Poor supportability of surface melt-freeze on N aspect at 6,700' at 9:30am. Forecaster
02/20/2018 - 13:15 South side of Grouse Rock Blackwood Canyon or Ward Canyon Area Snowpack Observation Wind scoured W aspects. Small skier triggered cornice failure on E aspect with very minor cracking on wind slab below. Forecaster
12/21/2016 - 12:20 Castle Peak Donner Summit Area Snowpack Observation Forecaster
12/15/2015 - 12:30 Grouse Rocks Blackwood Canyon or Ward Canyon Area Snowpack Observation Forecaster
01/09/2017 - 12:00 Hidden Peak West Shore Area Snowpack Observation Minor cracking of tiny wind slabs on summit of Hidden Pk.Pointing at the depth of non-refrozen wet snow all the way down to 120 cm.What was Dec 15 near crust facets, now moist from rain. Easily makes a snowball. Forecaster
02/02/2016 - 12:00 Rubicon Peak West Shore Area Snowpack Observation Forecaster
03/02/2016 - 10:30 South Side Castle Peak Donner Summit Area Snowpack Observation Forecaster
03/09/2018 - 11:00 Slab Cliffs Mount Rose Area Snowpack Observation Forecaster
11/21/2017 - 23:15 Incline Lake Pk and points to the NW. Mount Rose Area Snowpack Observation ESE aspect at around 8,600', ~12:30pm. Forecaster
02/03/2017 - 11:00 East Ridge Tamarack Peak Mount Rose Area Snowpack Observation Triggered wind slab at 9100', N aspect, 6-8'' deep. Debris from intentionally skier triggered wind slab.Triggered wind slab, N aspect, 9100', 8-12'' deep.ECTP-11.  14'' deep, N aspect, 9200' in wind loaded location. Forecaster
12/23/2017 - 11:00 Incline Lake Peak/Slab Cliffs Mount Rose Area Snowpack Observation 3-4'' of recent storm snow on top of old near surface facets with a deteriorating rain crust below.Minor wind loading of E aspect with small cornice formation from the recent W/SW winds. Forecaster
03/27/2016 - 12:00 Lincoln Ridge Yuba Pass Area Snowpack Observation Forecaster

Pages

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