These observations document past conditions at a small and variable scale. They are not too be confused with an avalanche forecast. They come from a variety of sources. We can only vouch for the quality of those produced by the SAC forecasters and professional observers.
Date and time of observation or avalanche occurrence Location Region Observation Type Photos Snowpack, Avalanche, Weather Videos Snowpit videos (tests, etc) Observation made by
12/10/2020 - 16:15 Blue lakes Five Lakes Area Snowpack Observation Public
12/11/2020 - 11:15 Silver Peak Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation Snowpit from a below treeline avalanche path. The snowpack was shallow and weak. Patches of dirt below 7000 ft. More wind affected slopes near the ridge. Forecaster
12/12/2020 - 01:45 Andesite Peak Donner Summit Area Snowpack Observation Very Small Wind slab (NE aspect) Educator
Tahoe Mountain School
12/12/2020 - 11:00 Grouse Rocks Blackwood Canyon or Ward Canyon Area Snowpack Observation 1 cm thick rain crust at bottom of new snow from freezing rain event. Thin rain crust was supportable but easy to intentionally break through. Freezing rain deposited on trees. Freezing rain deposited on rocks, trees, and evenly across the old snow surface. Forecaster
12/12/2020 - 12:45 Tamarack Peak Mount Rose Area Snowpack Observation Reverse tracks on N aspect Cracking and small slabs in top 2” of snow Wind transport onto S aspect Public
12/12/2020 - 14:30 Frog Lake Cliffs Carson Pass Area Snowpack Observation About 10 cms (~4 inches) of new snow on top of weak facets. Best attempt at capturing weak facets Skier trigger small wind slab. Ski kicks on convex rolls produced small wind slabs Looking up from debris at ski kick triggered wind slab Professional Observer
12/12/2020 - 15:00 Andesite Peak Donner Summit Area Snowpack Observation Educator
Alpenglow Expeditions
12/13/2020 - 11:00 Ridge of Tamarack above Tamarack Lake Mount Rose Area Snowpack Observation Public
12/13/2020 - 12:30 Castle Peak Donner Summit Area Snowpack Observation Cracking along N side of Castle west ridge, ~8300' Educator
Alpenglow Expeditions
12/13/2020 - 13:00 Lincoln Ridge Yuba Pass Area Avalanche Observation Small ski-kick-triggered wind slab avalanches on a wind loaded test slope The wind slab was about 8 to 12 inches thick Shooting cracks in wind loaded terrain 1f wind slab on top of a thin crust on top of 4f- old near surface facets Wind scoured areas along the ridge line Forecaster
12/13/2020 - 13:30 Andesite Peak Donner Summit Area Snowpack Observation Public
12/13/2020 - 14:15 Silver Peak Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation Public
12/13/2020 - 15:30 Chickadee Ridge Mount Rose Area Snowpack Observation small shooting crack Public
12/14/2020 - 02:00 Silver Peak Cabin Creek, Deep Creek, or Pole Creek Area Avalanche Observation Cornice collapse and wind slab avalanche Debris and bed surface covered by additional storm snow and wind blown snow Forecaster
12/14/2020 - 06:30 Grouse Rock Blackwood Canyon or Ward Canyon Area Snowpack Observation Public

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