Observer Name
Brett Kobernik
Observation Date
Friday, March 21, 2025
Avalanche Date
Thursday, March 20, 2025
Region
Skyline » Manti Canyon » South Fork
Location Name or Route
South Fork Manti Canyon
Elevation
10,200'
Aspect
North
Slope Angle
38°
Trigger
Snowmobiler
Trigger: additional info
Remotely Triggered
Avalanche Type
Hard Slab
Avalanche Problem
Persistent Weak Layer
Weak Layer
Facets
Depth
8'
Width
400'
Vertical
200'
Caught
2
Carried
2
Buried - Partly
1
Buried - Fully
1

Comments
A group of riders was parked at the bottom of the slope having lunch. A rider or two was jumping off the cornice onto the slope. Nothing happened. The group started to disperse after lunch. Two riders remained below the slope. Another rider was up on the far looker's right side of the slope when he triggered the avalanche from a distance (remotely). He was not caught. The two riders that remained below the slope were caught. One was thrown and fully buried with only a small amount of gear visible on the surface. The other rider was partially buried. The rest of the group quickly responded and were able to dig out the completely buried rider before it was too late. The riders that were caught had minor injuries.
The fracture line was 8 to 12 feet deep. Part of it was the remains of a cornice which accounts for it being very deep. However, the average slab depth was close to 8 feet. The avalanche basically broke to the ground.





Comments
It is very surprising that the avalanche did not release when the riders were jumping the cornice. It was ultimately triggered by a rider who was adjacent to the steep part of the slope. This demonstrates that just because there are tracks aready on a slope does not mean it is stable. This incident also demonstrates just how tricky and dangerous the current snowpack is on the Skyline.

Coordinates