North churchill slide

toured up starting @9, was around -10, rising to -2 by the time we got down around 3. Original plan for the day was skiing the couloir in the center of the first pic, but bailed once at treeline. Dug a pit around 2000m, snowpack was 160cm deep, with everything but the top 15cm very well consolidated. Top 15cm was loose and powdery where we dug, it collapsed @ 17 taps but wouldn't come off in a cohesive slab. Looked to confirm it a few meters away and the wind affect was much more significant, obvious slab on top. Post-pit I crossed a wind affected slope and heard hollow sounding snowpack in various spots, and then loud whumpf in a 2m wide by 10m tall strip. Promptly gtfo of there. Once back within treeline no wind affect and skiing quality was great. Some of the snow was more facety as we skied down the gully. Some old avalanche debris in the top section.