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Avalanche: Turnagain

Location: Lynx Creek

Date:
Observer:
Route & General Observations

Johnson Pass (N) trailhead into Lynx Creek drainage. Several fresh wind slab avalanches observed.

Avalanche Details
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Trigger NaturalAvalanche Type Soft Slab
Aspect West SouthwestElevation 2900ft
Slope AngleunknownCrown Depthunknown
Width 250ftVertical Run 1000ft
Avalanche Details

Several shallow wind slabs observed in the Lynx Creek area. These look to be in the 12-18" range on all aspects. The commonality is that these were all quite wide and connected, indicative of a buried surface hoar weak layer. Many were in very complex terrain not accessible by snowmachine though debris was observed to have run quite far in channelled terrain, well below treeline. These likely ran during or toward the tail end of last nights wind event.

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)?Yes
Observer Comments

Several recent avalanches observed on all aspects. Localized cracking was easy to initiate on steep wind-loaded test slopes.

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

Single digits all day from parking lot to 2300'. Clear skies. Intermittent winds 5-10 mph mainly from the WNW.

Snow surface

5-10" soft snow available for wind transport at 2300'.

Snowpack

4 snowpits with mixed results.

Pit #1: 2300'. HS=140cm. NE. Buried surface hoar (BSH) found 30cm below surface. ECTX, ECTP23 on BSH.
Pit #2: 2300'. HS = 250cm. W. No BSH found. ECTX
Pit #3: 1950'. HS = 165cm. E. No BSH found. ECTX
Pit #4: 1750'. HS = 145cm WNW. BSH found 50cm below surface (and below 2 rain crusts). CT 27 on BSH. CT13,14 on rain crust 30cm down.

Cracking and small shallow (fresh) wind slabs were easy to initiate with informal snowmachine slope testing. See photo below.

Photos & Video
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