Avalanche: Twin Lakes Pass

Observer Name
Weston & Shaun D
Observation Date
Monday, December 14, 2020
Avalanche Date
Monday, December 14, 2020
Region
Salt Lake » Little Cottonwood Canyon » Grizzly Gulch » Twin Lakes Pass
Location Name or Route
Lower Heavens Gate
Elevation
10,200'
Aspect
Northeast
Slope Angle
37°
Trigger
Skier
Trigger: additional info
Remotely Triggered
Avalanche Type
Soft Slab
Avalanche Problem
Persistent Weak Layer
Weak Layer
Facets
Depth
20"
Width
20'
Vertical
250'
Comments
Skinning up the usual skinner to lower patsy trees. We were intentionally veering off the skin track and towards the ridge to see if we could get anything to go. We stomped on a few building cornices lower on the ridge- nothing. As we ascended Shaun found the sweet spot. The start zone was holding more snow than the rest and showed signs that it had gotten wind loaded presumably by the overnight winds. It failed, propagated, and stepped down to the top of the early Nov storm. It ran ~250ft quickly loosing energy as the slope angle relaxed. At the crown you could see that it had initially failed on the 12/12-12/13 interface, but then quickly stepped down to the 11/8 interface. The slide did not clean out the sandbox and this slope will likely be a repeater.
Comments
Looked like it originally failed on a density inversion from the start of yesterdays storm. Stepped down to old snow(Nov 8th)/new snow (Dec 12) interface.
Coordinates