Avalanche: Turnagain

Location: Sunburst

Date:
Observer:
Route & General Observations

Sunburst Ridge up to 3,300′

Avalanche Details
If this is an avalanche observation, click yes below and fill in the form as best as you can. If people were involved, please provide details.
TriggerintentionalAvalanche Type0
Aspect SouthwestElevation 3000ft
Slope AngleunknownCrown Depth 10in
Width 100ftVertical Run 400ft
Avalanche Details

Skier triggered small soft slab on a short, but steep, rollover - Sunburst's SW facing slope. This rollover commonly slides with new snow and wind. 100ft wide, 8-16" deep and running around 400'. No one caught, triggered with a ski cut. Debris was damp and sluggish.

SS-AS-D1.5-R1-I

Other avalanche activity observed were several natural and human triggered sluffs. These were moderate in volume - enough to push someone around on sustained slopes.

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)?No
Weather & Snow Characteristics
Please provide details to help us determine the weather and snowpack during the time this observation took place.
Weather

Obscured skies with breaks in visibility now and then. Light snowfall until noon followed by a short graupel shower around 230pm. Temps in the upper 20'sF and 32F at the parking lot. Winds were light from the South and West.

Snow surface

Happy to report 8-10" of new snow above 2,500'. Below this, the snow became increasingly moist down to the parking lot (900') where 3" of wet snow existed.

Snowpack

Snow stability concerns were confined to the new storm snow. Very little wind has affected the snow at the elevations we traveled today and the new snow was quite loose and lacking cohesion. I'm suspect that more wind affect and slab formation occurred above 3,500'. We did see areas above 3,000' that were wind affected mid-storm that are now concealed by several inches of fluff.

*Warming of the new snow by sun and warm temps was the most concerning factor in slab development within the storm snow today. We saw this later in the day with thin cloud cover and intense sun (green-housing). In the video below, the snow was just starting to warm while minutes later we triggered a slab avalanche on a suspect rollover. Although this rollover was wind loaded mid-storm, the warming may have played a role to some degree.

Photos & Video
Please upload photos below. Maximum of 5 megabytes per image. Click here for help on resizing images. If you are having trouble uploading please email images separately to staff.