Avalanche

Noisy Basin

Rob MillspaughSwan Range
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Observation photo 1Observation photo 2Observation photo 3Observation photo 4Observation photo 5

Quick report

We visited the Northern Swan Range to get a snapshot of the snowpack between the waning rain event and incoming snow:

  • We noted 2 small wet avalanches that occured in the previous 48 hours
  • Wet snow near the surface was begining to refreeze into a crust at upper elevations
  • Large column tests yeilded mixed results on buried weak layers
  • Snowfall and wind gusts began in the afternoon as temperatures decrease
  • We relied on extreme back-seat skiing to overcome wet snow and abundant obstacles on our descent

 

 

Noticed two small wet avalanches that likely failed during rain on snow.

Weather

Cloud Cover
obscured
Wind Loading
light
Recent Snowfall
3
Snow Avail For Transport
small smounts

Low cloud obsurred skies. Bursts of graupel after noon with some moderate gusts. Drove through rain in Bigfork transitioning to heavy snow south of Soup Creek.

Snowpack

Snowpit @6500' NW aspect:  2 cm of fresh precip on top of 12 cm wet snow that was begining to crust.  ECTP5, ECTN5 down 25 cm on SH.  ECTP25, ECTX down 55cm on FC.   11/7  = 5 cm thick and down 72 cm. 

See attached pit profile.

Avalanche

Size
D1 R1
Type
U
Count
2
Aspect
NE
Trigger
N
Elevation
6200 ft

Narrow and thin track leaving exposed rock. Could not see origin or debris pile. Wet Loose or Wet Slab.