Avalanche: Alta Ski Area 11/13/2011

Observer Name: 
Tom
Observation Date: 
11/14/2011
Occurrence Date: 
11/13/2011
Occurrence Time: 
1:30pm
Region: 
Alta Ski Area
Little Cottonwood Canyon
Salt Lake
Location Name: 
Stonecrusher - Alta
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Location

40° 34' 58.9764" N, 111° 38' 0.3552" W
Avalanche Characteristics
Elevation: 
9600'
Aspect: 
Northwest
Slope Angle: 
Unknown
Trigger: 
Skier
Avalanche Type: 
Soft Slab
Depth (avg): 
20"
Width: 
45'
Vertical: 
500'
People Involved
Caught: 
1
Carried: 
1
General Comments

Triggered remotely after a skier was about 50 feet below the highest crown. He got carried slightly and then traversed safely to skiers right. I'm not sure if realized when he saw the slide or heard us yelling. The slide broke anywhere from 12" to 24" at the top and along the side about 12" halfway down the gully as well. It ran out down into another gully and may have caught others at the bottom as there was more traffic there (almost to the cat road). Our group noticed cracking and whumphing halfway down on the same shot on our first lap. Our group decided to go slightly south to Christmas Tree but a solo skier dropped Stonecrusher as we watched with no issues. This was about 1 hour before the second skier (also solo) triggered the slide. The second skier was notified of our findings from earlier. See photos and video for more details.

Alta Ski Lifts is not open for the season yet.

AvalancheStonecrusherAlta_11132011-2.jpg
AvalancheStonecrusherAlta_11132011-3.jpg
AvalancheStonecrusherAlta_11132011-4.jpg
AvalancheStonecrusherAlta_11132011.jpg
AltaBackcountryGunsightDiagram_11062011-2.jpg
Video 1: 
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