Observation: Lake Peak

Observation Date
3/15/2014
Observer Name
Greg Gagne
Region
Salt Lake » Little Cottonwood Canyon » White Pine » Lake Peak
Location Name or Route
White Pine - Lake Peak
Weather
Sky
Broken
Wind Direction
North
Wind Speed
Moderate
Weather Comments
Mild temps at trailhead with -8C atop Lake Peak at 10,600'. Moderate winds out of the North with occasional strong gusts. Mostly cloudy.
Snow Characteristics
New Snow Depth
2"
New Snow Density
Medium
Snow Surface Conditions
Powder
Dense Loose
Wind Crust
Melt-Freeze Crust
Snow Characteristics Comments

Perhaps an optimistic 5 cms new (2") but with so much wind slopes were either scoured to old crusts or there were some areas with up to 15 cms new where it had filled in. Several fresh 1F to Pencil hard wind slabs on primarily North and East aspects. These were up to 20 cms thick (8"). Without much snow available for transport, these wind slabs were not widespread and were mostly smaller pockets.

Red Flags
Red Flags
Recent Avalanches
Red Flags Comments
Triggered a class 1 soft slab avalanche from wind loading.
Comments

Route today was White Pine drainage to Lake Peak and Lake Chute. Evelyn's forecast was spot on - the only hazards we were identifying were small pockets of fresh wind drifts at mid and upper elevation aspects. These were somewhat sensitive and would crack around your skis. Quite easy to identify and manage. Exiting Lake Chute and wrapping around through North-facing Boulder Basin my partner triggered a class 1 soft slab as we were traversing a steeper North facing aspect. 20 meters (60') wide, 50 meters vertical. Crown was 20-30 cms (8-12"). This was exactly the type of terrain Evelyn was pointing out in her Saturday forecast. The weak layer was re-crystallized snow at the new/old snow interface. For those keeping score SS-ASu-D1/R1-I. To somewhat paraphrase from Aaron Rice's super nice observation from Monte Cristo, this was a manageable hazard in manageable terrain.

I would not be surprised to hear several stories of these types of skier-triggered fresh wind slabs by the end of the day on Saturday. However, I think a significant majority of the terrain is not wind loaded and has a Low danger.

No warming on the snow surface while we were out this morning. Perhaps a Moderate hazard for Sunday with any lingering wind slabs and warming on solar aspects.

Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate