Follow up on obs. of remotely triggered avalanches from 1/26, after snowfall stopped and visibility improved. Both are located approx. 100 yards apart, near treeline on leeward and wind-loaded slopes. Both are small-to-large soft slabs that released at the interface of new and old snow layers, with an average slab depth of approx. 24 inches. Both were unintentionally, remotely-triggered by a skier. Both slides occurred in exposed terrain with the potential to pull a skier or rider into trees, or over cliffs and rocks below. The smaller of the two codes: SS-ASr-R1-D1-I ; the larger of the two codes: SS-ASr-R1-D1.5-I
Signs of Unstable Snow
Did you see shooting cracks?
Did you experience collapsing or whumpfing?
A quick hand-pit was dug to reveal an overall strong-over-weak structure of the snowpack near treeline on an E-facing aspect. The pit was dug adjacent to recent avalanches.
Observed Avalanche Problem #1:
E-facing, near treeline. Small-to-large in size (D1-D2). Likely triggered by a skier/rider at the new/old snow interface, approx. 24in down. High confidence in likelihood thanks to evidence of recent avalanches and cracking, but low confidence in distribution of problem due to lack of observations.