Quick report
We observed no additional signs of instability. The weather was mostly clear with occasional clouds lasting <1hr. At the time of our arrival the slope was fully shaded as can be seen in photo 2. Travel up the face NW of the arch was done one at a time in between small gullies. After seeing the slide, we felt comfortable entering onto the bed surface ~100ft below the trigger point on the NE facing aspect to ski through the arch. The bed surface was relatively soft.
Avalanche
- Size
- D1
- Aspect
- NE
- Trigger
- AR
- Elevation
- 8800 ft
Snowboarder entering from the top of the chute triggered a 6"-10" slab on the NW facing side of the chute which failed to fully propagate to the NE facing side. The angled crown is visible in photo 1. It appeared that once the debris exited under the arch itself, the avalanche propagated towards the NW and SE, further in the SE direction, around 100-200 feet. This is visible in photo 2. The slide reached the trees below and passed through them ~<100 feet