Went for a second lap and ripped skins about 1/2 way up Flagstaff Shoulder uphill track at sunset. Followed tracks over a convex rollover and came across a new avalanche. New snow has very poor bonding to sun crust from past days. Soft slab broke and ran for about 100' and was ~40' wide. Small sloughing occurred elsewhere higher up on The face that didnt pose serious concern.