Avalanche: Turnagain

Location: PMS Bowl

Date:
Observer:
Route & General Observations

Toured up the west ridge of Magnum to PMS bowl.

Avalanche Details
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Trigger NaturalAvalanche Type 
Aspect UnknownElevationunknown
Slope AngleunknownCrown Depthunknown
WidthunknownVertical Rununknown
Observer Comments

Superbowl/Corner Pocket avalanche was seen from afar. It looks like it ran during the 12/18-19 storm. D3 size slide. The crown wrapped around the basin. We suspect the early December NSF or BSH was the weak layer due to the contiguous nature of the crown.

There was also a recent D1 on the Sunburst S face that looked to be cornice triggered (possibly from skiers/riders/dogs on the ridge).

The wind loading patterns on the S face of Sunburst showed top loading (cornices) and cross loading (pillowed and sculpted snow). There was a number of old wind slabs from the storm that were lower in the paths and looked to be from the cross loading.

We also observed a small (D1) wind slab in one of the N chutes on Magnum that looked like it was also from the storm. The crown was off the ridge lower into the track.

Red Flags
Red flags are simple visual clues that are a sign of potential avalanche danger. Please record any sign of red flags below.
Obvious signs of instability
Recent Avalanches?Yes
Collapsing (Whumphing)?No
Cracking (Shooting cracks)?No
Observer Comments

See avalanche details
No collapsing or cracking
Skier triggered sluffing observed on the steep west facing terrain of Magnum.
Cornice triggered D1 on Sunburst S face.

Weather & Snow Characteristics
Please provide details to help us determine the weather and snowpack during the time this observation took place.
Weather

Broken skies with some beautiful solstice sun
Temps in the teens
Very light wind

Snow surface

6-10 inches of Near Surface Facets with Surface Hoar to ridge tops.
Stiff wind effected snow on the ridge.

Snowpack

No formal tests

Photos & Video
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