These observations document past conditions at a small and variable scale. They are not to 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
12/16/2021 - 13:00 Poulsen's Peak Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation Sastrugi on S facing ridgeline from SW wind Small natural wind slab/cornice break on NE aspect at summit of Poulsen's peak Roller balls on W aspect below 7000'. Mostly skier triggered, some natural coming off of exposed rock. Guide
Alpenglow ExpeditionshA
12/16/2021 - 12:30 Hidden Peak West Shore Area Snowpack Observation Small cracking in wind loaded terrain Wind scoured snow near ridgelines Small 3-4'' wind slab failures Small wind features forming on ridgelines Forecaster
12/16/2021 - 12:00 Shirley Canyon Cabin Creek, Deep Creek, or Pole Creek Area Avalanche Observation Public
12/16/2021 - 02:26 Above Snow Lake Desolation Wilderness Area (including Emerald Bay) Avalanche Observation Public
12/15/2021 - 14:00 Castle Valley Meadow Donner Summit Area Snowpack Observation Guide
Alpenglow ExpeditionshA
12/15/2021 - 13:00 Castle / Andesite Donner Summit Area Avalanche Observation Small natural wind slab avalanche near Castle Peak Public
12/15/2021 - 13:00 Castle peak Donner Summit Area Snowpack Observation Public
12/15/2021 - 12:30 Gold Star Peak Snowpack Observation Clouds starting to move into the area ahead of the storm forecasted for tonight. Winds started to pick up in the afternoon and began blowing snow off the trees. Forecaster
12/15/2021 - 12:00 Border Ruffian Carson Pass Area Snowpack Observation Professional Observer
12/14/2021 - 13:30 Waterhouse Peak Luther Pass Area (including Job and Freel) Snowpack Observation 100+cm Boot pen. Shooting cracks through storm snow. Professional Observer
12/14/2021 - 12:30 Andesite Peak Donner Summit Area Snowpack Observation 4+ ft of new snow had accumulated on the lower elevations of Andesite with more at the higher elevations. Minor cracking in a soft wind slab on a wind-loaded E facing test slope around 8100 ft on Andesite Peak Wind-loaded test slope on Andesite Peak. Ski kicks released small pieces of cornice that then triggered small sluffs in the new snow on this slope. It looked like there was buried debris at the bottom of the slope indicating that it had avalanched sometime during the storm. Wind-loaded slope where I could trigger loose snow sluffs by pushing snow onto the slope with my pole from a safe spot above the slope. It looked like there was buried debris at the bottom of this slope as well. Forecaster
12/14/2021 - 11:15 Johnson Canyon Donner Summit Area Snowpack Observation Educator
West Wind CollectivehW
12/14/2021 - 01:01 Relay Ridgeline Mount Rose Area Avalanche Observation Public
12/13/2021 - 15:35 Mt. Rose Highway Mount Rose Area Snowpack Observation Public
12/13/2021 - 12:00 Pickett Peak Woodfords Canyon Snowpack Observation Professional Observer


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