Avalanche: Other Regions

Location: Grandview

Date:
Observer:
Route & General Observations

Moose Pass to Grandview.

Avalanche Details
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Trigger SnowmachinerAvalanche Type Hard Slab
Aspect WestElevation 2000ft
Slope AngleunknownCrown Depth5ft
Width 500ftVertical Run 800ft
Avalanche Details

1 snowmachine- triggered avalanche (1st photo) and several other deep wind slab pockets. Spoke to party and avalanche was triggered from below, lookers left side. Lookers left pocket then sympathetically triggered lookers right (larger) avalanche. May also have sympathetically triggered a wind slab above. Nobody caught.

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)?Yes
Cracking (Shooting cracks)?Yes
Observer Comments

Felt multiple collapses throughout the day. 1 snowmachine-triggered avalanche, 2 smaller (deep) wind slabs and 1 larger wind slab that stepped down. See photos.

Note: all avalanches were in the 2000-2500' range and all had a westerly component.

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

Snowing lightly in the morning and clearing throughout the day. Winds were calm. Low to mid-30's F.

Snow surface

3'+ storm snow settled to about 2.5'. Consistent powder. Noticing sun affect late in the day on Trail Lake.

Snowpack

Did not dig formal pit today. Snowpits from previous 2 days in Turnagain make me think that weak layer was facets/ bsh (Jan.21) below storm snow interface.
Many sled-cuts on small terrain yielded no results but recent avalanches speak for themselves. We kept our terrain choices very manageable today.

Photos & Video
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