Route & General Observations
Moose Pass to Grandview.
|Trigger||Snowmachiner||Avalanche Type||Hard Slab||Aspect||West|
|Elevation||2000ft||Slope Angle||unknown||Crown Depth||5ft|
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.
Obvious signs of instability
|Recent Avalanches?||Yes||Collapsing (Whumphing)?||Yes||Cracking (Shooting cracks)?||Yes|
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.
Snowing lightly in the morning and clearing throughout the day. Winds were calm. Low to mid-30's F.
3'+ storm snow settled to about 2.5'. Consistent powder. Noticing sun affect late in the day on Trail Lake.
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.