Manto nivoso

Southern Wallowas

Victor McNeilSouthern Wallowas
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Quick report

Collapsing
isolated

Followed the East Fork of the Pine up to the Blue Creek Saddle on snowmobiles.  We observed two recent natural avalanches up the West Fork of Pine Creek, near Pine Lakes.  These two naturals had the characteristics of Persistent Slab avalanches, likely failing during the storm cycle 2/23-2/24.  

During our ride, we found the Valentine's Buried Surface Hoar layer on a NE and West aspect around 7,500 feet.  On the NE aspect, it was reactive in our snowpack tests.  The same layer was found on a West aspect down 2 feet, but wasn't reactive at that location.  

Observed two natural avalanches up the West Fork of Pine Creek, near Pine Lakes. Had a collapse while working on our snowpack assessment.

Weather

Air Temp
27
Cloud Cover
clear
Wind Loading
previous
Recent Snowfall
20
Snow Avail For Transport
moderate amounts

Beautiful day in the mountains, with no wind and mild temperatures.

Snowpack

We found poor snowpack structure on a NW aspect at 7,500 feet, with the Valentines Buried Surface hoar reactive in two of our Extended Column Tests.  ECTP30 down 76cm or 2.5 feet.  We found a 1 Finger hard slab above the Buried Surface Hoar.