Observation Date:
February 13, 2020
Submitted:
February 14, 2020
Zone or Region:
Challis Area and Lost Rivers
Activity:
Skiing/Snowboarding
Location:
Lost River
Did you trigger any avalanches?
Yes
Was it intentional?
Yes
Avalanche Type:
Hard Slab
Size:
Size 3: Could bury and destroy a car, damage a truck, destroy a wood frame house, or break a few trees
Elevation:
alpine
Aspect:
N
Comments:
Remotely triggered deep slab from ridgeline. Entire bowl collapsed, two sizable pockets ripped out. Crowns 3-8' deep, each pocket was several hundred feet wide, 1F to P hard slab. Debris 20-30' deep, ran 1,700'. Ran near the ground, where 20-30cm of depth hoar are sitting under a 3-5cm melt-freeze crust with 3-5cm of advanced facets on top. Really ugly snowpack structure.
Photo:
Did you observe any avalanches?
Yes
Avalanche Type:
Hard Slab
Size:
Size 3: Could bury and destroy a car, damage a truck, destroy a wood frame house, or break a few trees
Elevation:
alpine
Aspect:
Comments:
Several deep slab crowns on northern half of the compass. Tough to be certain on how recent these are, due to lack of snowfall and wind
Did you see shooting cracks?
No
Did you experience collapsing or whumpfing?
Yes, Isolated
Really ugly snowpack structure. Brutal full depth facet trail breaking. Fun.