Wed, Dec 30, 2020 - 6:37 PM
Evan and MJ
Three Sisters Area
Snow Conditions Avalanche Activity Other
Ski or Snowboard
Group of four toured to Todd Lake from Dutchman Flat Snow Park at 0530. There was a significant amount of accumulation on the trail with skis penetrating from mid shin to knee with more snow falling.
We dug a pit at 6300 on ESE aspect at approximately 0730 on a 25° slope. The snowpack was 210 cm with 65 cm of storm snow. Rain crusts were present at 145 cm and 135 cm. The storm snow easily penetrated with fist until the pencil hard crusts. Four finger snow was present above and below. CT test revealed no fractures or instabilities and the new snow seemed to be bonding well. Small windslabs/cornices were noted at the top of the ridge but were not fracturing under skis or sliding on test slopes. There was little to no wind and no snow transport.
We skied three laps over the course of four or so hours on 25-33° slopes. The storm snow was settling throughout the day and we began experiencing firmness across the top layers of snow. One party member trigger a small shallow slide while descending through steep rocks that propagated about 5 feet ran about 10. Also, another member had reported fractures while descending.
Due to the change in conditions we boogied out of there. Snow was still falling and wind was hitting east aspects coming from the east (5-10 mph). Of note, the new storm snow was only sitting at ankle height on our skin track on the way out where it was shin to knee height four hours earlier.