Avalanche: Turnagain

Location: Sunburst

Date:
Observer:
Route & General Observations

Sunburst up to 3,400′

Avalanche Details
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Trigger NaturalAvalanche Type 
Aspect SouthElevation 2700ft
Slope AngleunknownCrown Depthunknown
Width 80ftVertical Run 80ft
Observer Comments

This avalanche occurred in the early to mid afternoon and was either remotely triggered or natural. See photo.

Red Flags
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Obvious signs of instability
Recent Avalanches?Yes
Collapsing (Whumphing)?Yes
Cracking (Shooting cracks)?No
Observer Comments

2 avalanches occurred on the South side of Tincan, one at 2,700' - D2, and one at 3,500' - D1. Multiple collapses between 2,300-2,600 small to medium in estimated size.

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

Sunny skies, warm temps, calm wind, no precip

Snow surface

1,000'-2,500' - surface refreeze of 6" overnight, with melting during the day
2,500'-3,400' - mostly dry surface with South aspects producing small roller balls late in the day

Snowpack

We dug in 4 locations along Sunburst ridge. High variability was found in pits. The underlying surface was mapped prior to the March 16th storm and showed mostly firm wind affected surfaces along Sunburst ridge. In these locations bonding between the St Patty’s slab and the old wind crusts/slabs was good (pits 2, 3, & 4). In areas we mapped that had facets prior to the Mar 16 storm bonding was not as good and tests showed moderate strength and high propagation potential (pit 1). Slab thickness varied and ranged between 30cm and 75 cm.

Pit 1 - 2,500’ SW - 55cm slab - see pit profile
Pit 2 - 2,900’ WNW - 40cm wind slab
Pit 3 - 3,100’- SW - 75 cm slab
Pit 4 - 3,400’ - S - 30 cm slab

Photos & Video
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