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Avalanche: Turnagain

Location: Tincan Trees

Date:
Observer:
Route & General Observations

Set a skin track from Center Ridge to Tincan Trees up to 1800 ft on Tincan’s W ridge. Tons of whumphing on entire tour, shooting cracks in lower elevations, and many natural avalanches observed (from storm or after storm).

Avalanche Details
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Trigger NaturalAvalanche Type Unknown
Aspect NorthwestElevation 2500ft
Slope AngleunknownCrown Depthunknown
Width 200ftVertical Rununknown
Avalanche Details

Large, probably natural avalanche, on Sunburst that started near the lower ridge and propagated quite far, ripping down to expose alders.

Noticed small avalanche on Magnum on same aspect and approx. elevation.

Small D1 natural observed near powerline not far from Center Ridge pull-out that appeared to have released in the storm.

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)?Yes
Cracking (Shooting cracks)?Yes
Observer Comments

Experienced a TON of whumping both while breaking trail, and while skiing down our existing skin track. What was so interesting about this, is that we had whumphing in areas we had both previously skinned up. On one slope in Tincan Trees we experienced a double whumph in the same spot where we believe multiple weak layers (likely BSH) collapsed one after another. Shooting cracks occurred near and not far from the Center Ridge pull-out, with a few more at lower elevations when stomping on test

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

Center Ridge parking lot at noon - broken skies, no wind, and no precip.
1600 ft in Tincan Trees at 1:30 pm - overcast skies, light winds, S-1.
1800 ft in Tincan Trees at 2:30 pm - broken skies, calm to light winds from the North, no precip.
Center Ridge Parking lot at 4 pm - broken skies, no wind, and no precip.

Snow surface

20+ inches of wet, heavy new snow everywhere. Difficult trail breaking. Ski penetration - boot top to knee, Boot penetration - hip.

Snowpack

Dug a snowpit in Tincan Trees at 3 pm at 1800 ft on a NW aspect. 20 degree incline. HS = 155 cm. Found 3 layers of buried surface hoar. Top layer of BSH 3-6mm crystals. CT15 45 cm down from surface collapsed on a density change in the new snow. ECTP 13, 15 SC down 83 cm on the closest BSH to the surface. PST 25/100 END. Full pit profile to ground shown below.

155
F
110
4F
75
4F
72
4F BSH
70
1F
65
BSH
64
1F+
60
P
50
1F
40 BSH
4F
35
4F
30
1F
10 K
1F
0

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