Observer Name
Greg Gagne
Observation Date
Sunday, February 12, 2012
Avalanche Date
Sunday, February 12, 2012
Region
Salt Lake » Big Cottonwood Canyon » Twin Lakes Pass
Location Name or Route
Twin Lakes Pass
Elevation
10,000'
Aspect
North
Slope Angle
39°
Trigger
Unknown
Trigger: additional info
Unintentionally Triggered
Avalanche Type
Soft Slab
Weak Layer
Facets
Depth
7"
Width
100'
Vertical
150'
Comments
Remotely triggered slide just off of and South of Twin Lakes Pass. SS-ASr-R3-D1.5 This bed surface had slid back in January and the snow since Thursday (now totaling 20 cm or 8") was sitting on top of very weak faceted snow. The near-surface facets that have been preserved underneath the Thursday snow really just needed a large enough slab to make them reactive. All my stability tests today indicated they required a fairly steep slope (approaching 40 degrees) to make them reactive.
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Coordinates