Observation: Public
Observation Details
Name:
Peter SundbergObservation Date:
December 24, 2020Submitted:
December 24, 2020Zone or Region:
West NorthActivity:
Skiing/SnowboardingLocation:
Mt Baker Wilderness, Coleman PinnacleTriggered Avalanches
Did you trigger any avalanches?
YesWas it intentional?
NoAvalanche Type:
Hard SlabSize:
Size 1: Relatively harmless to peopleElevation:
4500 - 5000Aspect:
NComments:
Triggered two wind slabs remotely on lee NE - NW aspects. Both occurred on convex features greater then 35 and propagated 20 ft across and 4 - 8 inches deep. Neither ran more then 10 - 15 yards, but both were triggered from 15 - 20 ft away.Photo:
Signs of Unstable Snow
Did you see shooting cracks?
Yes, IsolatedDid you experience collapsing or whumpfing?
Yes, IsolatedObservations
Winds were strong from the S and there was evidence of wind loading on lee aspects well below ridge line and in some cases below tree line. Wind load was rapid and slabs increased in sensitivity over the course of several hours. our party avoided large open slopes greater then 25, but still remote triggered two wind slabs on steeper slopes greater then 35. Wind loading was wide spread.
Media
