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Observations

Region: Turnagain
Location: Lynx Creek
Observer:
Date:

Route & General Observations

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

Avalanche Details

Avalanche details

Trigger NaturalAvalanche Type Soft SlabAspect West Southwest
Elevation 2900ftSlope AngleunknownCrown Depthunknown
Width 250ftLength 1000ft  

Observer Comments

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

Obvious signs of instability

Recent Avalanches?YesCollapsing (Whumphing)?NoCracking (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

Weather

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

Snow Characteristics

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

Video

Photos



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