Explosive triggered slide at Big Sky

Big Sky Resort
Northern Madison
Code
HS-ABc-R3-D2-O
Elevation
10901
Aspect
N
Latitude
45.28
Longitude
-111.45
Notes

"We triggered a large avalanche in the Cirque with a 5lb. shot dangled from the Tram.  The slide broke 3’ deep and took out the Dobies, Cron’s and part of the Ramp Shot avalanche paths.  Hard slab- 1F minus generally.  Storm slab from the past 8 days.  The slide ran on a crust that formed from the left over snow from mid- October that got warmed in the 3rd week of October.  The weak layer was just a thin layer of lower density snow trapped under the hard slabs- didn’t seem to be particularly faceted. Some grauple. The crust is not very hard or slick, about 2cm thick, and crumbled easily in hand... The slide had good propagation and the crown was at least 300’ long- impressive debris pile." -Big Sky Ski Patrol

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
An explosive detonated above the snow surface (air blast)
Trigger Modifier
c-A controlled or intentional release by the indicated trigger
R size
3
D size
2
Bed Surface
O - Old snow
Slab Thickness
36.0
Slab Width
300.00ft
Weak Layer Grain type
Precipitation Particles
Weak Layer Hardness
F+
Slab Layer Hardness
1F-