Observer Name
Zimmerman-Wall
Observation Date
Monday, March 5, 2018
Avalanche Date
Monday, March 5, 2018
Region
Provo » American Fork » Mary Ellen Gulch
Location Name or Route
Y Not Buttress
Elevation
9,500'
Aspect
Northeast
Slope Angle
Unknown
Trigger
Snowmobiler
Trigger: additional info
Unintentionally Triggered
Avalanche Type
Soft Slab
Avalanche Problem
Persistent Weak Layer
Weak Layer
Facets
Depth
3'
Width
45'
Vertical
100'
Comments
Watched one, or two sledders meander all over the steeper slopes of Y Not and Outhouse in Mary Ellen Gulch. High marking without incident for the most part. Turned away to have some lunch and when I looked back there was a small slide at the apex of one of their high marks mid slope on a convexity near some scrubby trees. I assume they throttled out, but did not witness the slide and the trigger continued to rip around on even larger faces without additional activity. See Slide pictured in middle of frame. Approximate dimensions viewed from across drainage.
Coordinates