|Location:||Marmot SW face|
Route & General Observations
Mid-elevations, all aspects, highly discontinuous and shallow snowpack (HS 25cm-40cm), heavily scoured and loaded in isolated to specific areas, localized whumphing and shooting cracks. Persistent slab sensitivity stubborn to touchy.
Upper elevations, all aspects, in specific locations where winds deposited more continuous, thicker and cohesive hard slabs the persistent slab avalanche problem was more significant, up to 85cm (3 feet deep), averaging 45cm (1.5 feet deep). Persistent slab sensitivity touchy. Human triggered avalanches likely, remotely triggered avalanches possible.
Old raised tracks on some steep upper elevation slopes, sastrugi, supportable and breakable crusts and old wind slabs. Slabs begining to facet out, areas without cohesive slab are pure facets.
The gem for skiers or boarders would be finding a zone that lacks the slab and skiing pure square powder. We did not find it.
|Trigger||Skier||Avalanche Type||Hard Slab||Aspect||South Southwest|
|Elevation||3900ft||Slope Angle||40deg||Crown Depth||3ft|
avg crown height 1.5 feet;
touchy trigger from low angle (30 deg) ridgeline
Obvious signs of instability
|Recent Avalanches?||Yes||Collapsing (Whumphing)?||Yes||Cracking (Shooting cracks)?||Yes|
Cracking an whumphing abundant. Localized up to 15 meters, depth 25 to 40 cm. Mod strength, Poor structure, high energy.
Recent avalanche same aspect and elevation, winds Jan 5?
Ta= -9.2C, Ts= -7C @ 3400', Calm, surface snow NSF 0.5
NSF, wind board 2-6" thick, wind exposed xtra fragile faceted crust
Old wind slab over weak mid-pack over extra weak depth hoar