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Avalanche: Turnagain

Location: Bertha Creek Campground

Date:
Observer:
Route & General Observations

Cornbiscuit parking lot to Bertha Creek Campground area to conduct rescue drills and snowpit tests.

Avalanche Details
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Trigger NaturalAvalanche Type Soft Slab
Aspect East SoutheastElevation 2000ft
Slope Angle 35degCrown Depthunknown
Width 100ftVertical Run 500ft
Avalanche Details

SS-N-R1-D2-U

Observed a couple small wind slab pockets on motorized side above Bertha Cr. Campground.

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

2 small avalanches noted above.
Very localized cracking at the storm snow interface (about 55cm deep).

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

Snowing 1cm+/ hr til noon. Clearing skies after noon on the South side of Turnagain Pass. Winds were light at road elevation. Noticed some moderate flagging on Seattle ridge from East winds. 28*F in morning. 32*F at 5pm.

Snow surface

New snow was ~55cm deep. Heavy, moisture-laden new snow made for deep trenching with snowmachines. SUper fun riding, DEEP!

Snowpack

HS= 120cm
HNS= 55cm
CT4,6,8
ECTP4, 8, 16

All column tests were failing about 75cm down on a layer of facets/ buried surface hoar over a thin crust.
Cory did a couple snowmachine slope cut tests with no results.

Photos & Video
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