Snowmobiler triggered on Skyline Ridge

Skyline Ridge
Southern Madison
Code
HS-AMu-R2-D2.5
Elevation
10000
Aspect
SE
Latitude
44.91620
Longitude
-111.22000
Notes

From an email:

" There was a avalanche on Sunday in Cabin Creek, it appears that a few rider's were high marking an open face, didn't see it happen but I did observe rider's from a distance in that area."

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Snowmobile
Trigger Modifier
u-An unintentional release
R size
2
D size
2.5
Problem Type
Wind-Drifted Snow
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche