Avalanche: Christmas Tree Bowl

Observer Name
Jeremy Jensen
Observation Date
Saturday, April 8, 2017
Occurrence Date
Saturday, April 8, 2017
Occurence Time
1:00pm

Region:

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
Storm Slab
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