Route & General Observations
Toured from IMB > Microdot > Nose Bleed
|Trigger||Foot Penetration||Avalanche Type||Soft Slab||Aspect||North|
|Elevation||4400ft||Slope Angle||37deg||Crown Depth||20in|
SS-AFr-D1.5-I new snow failing on old snow layer of NSFs, remotely triggered on foot
Also SS-ASc-D1-I x2 40-50cm deep x 10'wide x 15' long
Many slab and dry loose avalanches W>N>E, 2500'-4500'
Obvious signs of instability
|Recent Avalanches?||Yes||Collapsing (Whumphing)?||Yes||Cracking (Shooting cracks)?||Yes|
Multiple recent natural slab avalanches, W>N>E, 2500-4500' (mid to upper elevations), D1-2, during and shortly after 4/16-17 storm
Recent natural loose dry on all aspects but predominantly on northerly aspects on slopes 35 degrees and steeper, with more significant and larger loose dry on 40 degrees and steeper, D1.5. Example: All of Rae Wallace northerlies sluffed out. See picture.
Recent natural wet loose on steep southerly aspects failing on crusts, D1-1.5
50cm new snow 4/16-17
4500' H29F, 3500' H36, greenhousing, high humidity
calm winds observed up to 4500', no flagging observed
New storm slabs sitting on the old snow surface of NSFs on northerly aspects sensitive to human triggers on unsupported, steep convex slopes, 40 degrees and steeper. Northerly aspects on 4068, on slopes approximately 38 degrees, saw a good amount of skier traffic with no avalanche activity.
In most other locations, and on slopes 35 degrees and less, storm slabs were not reacting to human triggers.
The new snow was very warm today (hot pow) and appeared to be bonding to the old snow surface. Cold temps this evening should improve stability for tomorrow.
Loose wet avalanches were observed on steep southerly aspects, failing on old crust surfaces.
Loose dry avalanches were widespread and large on slopes 40 degrees and steeper.