Avalanche: Turnagain

Location: Magnum PMS Bowl

Route & General Observations

We took the standard uptrack to PMS bowl up to 3,000 feet and skied low angle terrain on a southwest shoulder.

Avalanche Details
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Trigger CorniceRemote Trigger No
Avalanche Type Hard SlabAspect Southwest
Elevation 3200ftSlope Angleunknown
Crown DepthunknownWidthunknown
Vertical Run 1000ft  
Avalanche Details

We observed what appeared to be a cornice fall that triggered a wind slab which further entrained storm snow and ran almost all the way to the creekbed between Magnum and Cornbiscuit. The wind slab appeared to fail close to the ground as we saw rocks among the bed surface. We estimate the wind slab crown to be about 25 feet. The crown depth we estimate to be about 4 feet at its deepest. The debris was scattered with large cornice chunks and was predominantly soft storm snow. We are unsure whether there was a storm slab associated with the avalanche or if the debris we saw was simply entrained storm snow.

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

We found a glide crack where the standard uptrack usually exists. It is difficult to see from below until you are directly beneath it, especially if the visibility is bad.

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

Pleasant until about 1pm when the winds picked up and light precipitation began as tonights storm arrived.

Snow surface

We observed small surface hoar to about 1,400 feet.


We dug a 140 cm deep pit at 3,000 feet on a southwest aspect and got an ECTX. Structure appeared to be right-side-up. We did not note any weak layers.

Photos & Video
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