Avalanche: Mirror Lake Highway

Observer Name
Neil Provo
Observation Date
Tuesday, January 24, 2017
Occurrence Date
Tuesday, January 24, 2017
Occurence Time
Afternoon

Region:

Location Name or Route
Mirror Lake Highway
Elevation
9000
Aspect
Northeast
Slope Angle
Unknown
Trigger
Snowboarder
Trigger: additional info
Intentionally Triggered
Avalanche Type
Soft Slab
Avalanche Problem
Storm Slab
Weak Layer
Surface Hoar
Depth
15"
Width
40
Vertical
60
Comments
While powsurfing in bench-like terrain, avalanches were easily triggered on top of convex rolls with the slightest human input. I suspect they were sliding on surface hoar and/or buried facets. It was spotty as the snow was stable in some places, and very sensitive in other spots. I saw 5 natural avalanches that probably ran during the storm ranging from 30-80ft wide, all on northeast facing slopes between 8000-9500ft. The terrain we were riding was pretty low angle with steep spots in between, and it was predictable where the slabs would be touchy. In bigger terrain with more vertical this depth of slide could do serious damage.
Coordinates