Observation Date: 02/13/2018

We were riding the upper bowls of copper creek, Lincoln Montana when a sled infront of us high marked a severly wind loaded, 60 degree slope. The crown apeared to be 3-4 ft and broke as the sled arced the top. Snowmobiler was lucky and escaped out the side. During the next few hr, we saw 3 more similiar sized slides in the same area.
I ride this area often, todays slides were unprecedented, though so was the level of wind loading over the entire area.

Sunny, 20F, wind out of the west 15 kts, gusts to 25 kts generally blowing down the valley.

Blowing surface snow, Wind crust and pillows over the entire area.

New Snow: No New Snow

Avalanche Activity:
4 mid sized that we saw, a few small ones we caused. Snow was hard, wind loaded. 50 – 60 degree slopes, 8000 ft elevation.

Other Comments:

Observer: Steve Lamphier