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Observations

Region: Outside of Advisory Area
Location: Grandview
Observer:
Date:

Route & General Observations

Moose Pass to Grandview.

Avalanche Details

Avalanche details

Trigger SnowmachinerAvalanche Type Hard SlabAspect West
Elevation 2000ftSlope AngleunknownCrown Depth5ft
Width 500ftLength 800ft  

Observer Comments

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

Obvious signs of instability

Recent Avalanches?YesCollapsing (Whumphing)?YesCracking (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

Weather

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

Snow Characteristics

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

Photos



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