Observer Name
Carl Dec
Observation Date
Saturday, December 11, 2021
Avalanche Date
Saturday, December 11, 2021
Region
Salt Lake » Big Cottonwood Canyon » 10420 » Lanes Leap
Location Name or Route
Lanes Leap
Elevation
9,600'
Aspect
Northeast
Trigger
Skier
Trigger: additional info
Remotely Triggered
Avalanche Type
Soft Slab
Avalanche Problem
Persistent Weak Layer
Weak Layer
Facets
Depth
17"
Width
150'
Comments
Travel on the 10420 ridge from the guardsman's pass parking lot looking to see how coverage is getting onto the ridge, in Promise Land and see how the snow was adjusting.
On the way up noted, what appeared to be a natural avalanche just west of Lance's Leap, which is where we triggered today's slide. The debris had just a touch of new snow on it indicating that is ran at the tail-end of the storm last night. We observed shooting cracks as we moved up the ridge and trigger this remotely from 20 or 30'.
SS-AS-u-D2-R2
The avalanche took out all the new storm snow running on facets above the old snow surface.
We continued up the ridge and wanted to correlate this level of sensitivity with some quick CT's.
HS 85
Results were CT12 @45 SC and CT13 @45 SC.
The bottom 40cm is a facet sandwhich with crusts down 55cm and 65cm.
If we get enough snow from the next storm the addtitional load may be enough to cause avalanches to break into this deeper, weak snow.
1st photo - Older natural?
2nd photo Remotely triggered
3rd layers
Coordinates