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Observer Name: 
Zimmerman-Wall
Email: 
sean@patagoniaskitours.com
Observation Date: 
Monday, March 5, 2018
Occurrence Date: 
Monday, March 5, 2018
Occurence Time: 
1:00pm
Region: 
Mary Ellen
Location Name or Route: 
Y Not Buttress
Elevation: 
9500
Aspect: 
Northeast
Slope Angle: 
Unknown
Trigger: 
Snowmobiler
Trigger: additional info: 
Unintentionally Triggered
Avalanche Type: 
Soft Slab
Avalanche Problem: 
Persistent Slab
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: 
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