Valanga

Lost Trail Backcountry

Cam MackenzieBitterroot
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Quick report

Collapsing
specific

Quick walk behind Lost Trail on the drive to Missoula. Once I left the ski area I experienced a collapse and dug on a north aspect at 8000'. I found very well preserved surface hoar and repeateable ECTP1 10 inches down on the Feb 14th buried surface hoar. For fun, I created larger columns 180cm wide and still had full propagation on the first tap from the wrist. While specific in distribution, this problem is very reactive. 

Walked onto open north facing slope at 8000' and created a rolling collapse that affected the entire 200'x200' area.

Weather

Air Temp
18
Cloud Cover
scattered
Wind Loading
none
Recent Snowfall
10 inches since Feb 14th
Snow Avail For Transport
moderate amounts

Cool clear day with minimal wind.

Avalanche

No fresh avalanches observed. On the drive to Missoula I glassed the central Bitterroot and found multiple D1.5 avalanches from previous cornice failure.