Leavitt Halfpipe SS-AM-R2-D2-I

Location Name: 
Leavitt Creek Halfpipe
Region: 
BWRA
Date and time of avalanche (best estimate if unknown): 
Thu, 01/10/2019 - 14:40
Location Map: 


Red Flags: 
Recent avalanche activity
Recent loading by new snow, wind, or rain
Terrain Trap

Observation made by: Avalanche Specialist
Avalanche Observations
Avalanche Type: 
Dry
Slab
Slope: 
38degrees
Trigger type: 
Snowmobiler
Crown Height: 
2 ft
Aspect: 
Northeast
Weak Layer: 
Old Snow
Avalanche Width: 
300ft.
Terrain: 
Below Treeline
Elevation: 
9 100ft.
Bed Surface: 
Old Snow
Avalanche Length: 
75ft.
Number of similar avalanches: 
3
Number of people caught: 
1
Number of partial burials: 
0
Number of full burials: 
0
Did the avalanche hit a building, vehicle, or structure?: 
Yes
More detailed information about the avalanche: 

On Thursday 20190110 at 14:40pm a snowmobile on a 34 degree slope triggered a soft slab avalanche in the Leavitt Creek Drainage. On the fourth slope cut the slab broke to a depth of 70cm, pushing the snowmobile & rider from their path with no burial. Tracks on a piece of intact slab could be seen within the debris. The avalanche occured in a drainage feature, propagating through trees & rocks on a wind deposited NE aspect. The old snow/ new snow interface acted as a bed-surface with facets as the persistent grain type. An inversion overnight has the facets rounding. As slabs perform, it broke above the rider in a 38 degree convex roll. Within cavities around the slide chains of depth hoar could be found near shallow rocks & trees. The individual escaped without damage or injury.

Avalanche Photos: 
Snowpit or crown profile photo or graph: 
Public Photo
Weather Observations
Blowing Snow: 
No
Cloud Cover: 
75% of the sky covered by clouds
Air temperature: 
Above Freezing
Wind Speed: 
Calm
Precipitation: 
None
Air temperature trend: 
Static
Wind Direction: 
South
Accumulation rate: 
None
More detailed information about the weather: 

Calm S winds. Sky went from overcast to partly cloudy with an air temperature of 6C. Inversion overnight at location