11th Annual Utah Snow & Avalanche Workshop Open and Motorized Sessions Oct. 27th.
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Observer Name: 
Jeremy Jensen
Observation Date: 
Saturday, April 8, 2017
Avalanche Date: 
Saturday, April 8, 2017
Location Name or Route: 
Christmas Tree Bowl
Elevation: 
9700
Aspect: 
North
Slope Angle: 
38
Trigger: 
Snowboarder
Trigger: additional info: 
Unintentionally Triggered
Avalanche Type: 
Soft Slab
Avalanche Problem: 
New Snow
Weak Layer: 
New Snow
Depth: 
10"
Width: 
150
Vertical: 
400
Comments: 

Storm slab avalanche occurred 4 or 5 turns into a N facing convex slope that rolls away from 37 degrees or so to maybe 39 or so triggering a small section that propagated to a larger area 10 ft below spanning maybe 130 ft wide. Rider was on a powsurfer but able to point it down hill to to outrun the slab as the snow buckled underfoot and about 100 ft in front of him.   A few minutes later the second powsurfer dropped in lookers right to avoid the slab and debris and triggered another section 60 ft or so wide at about the same point on the slope and able to ride thru the shallow slab without incident.   Slides ran only a short distance into the flat section of the bowl and piled up 6 feet deep or so at the toe of the debris. 

Comments: 

Photos show the initial slab from the first rider, then the second slab. Frame grabs from video taken showing the cracking and buckling. Also debris pile at the toe. 

 

Video: 
Coordinates: 
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