I found that yellow dotted pocket of moderate avy danger today. We were on a ridge just above a convex slope with two previously skied gullies on either side at 10,400ft in elevation. Previous skiers had caused sluff slides of the top 4” that laid on top of a sun crust. It looked boney. Our first skier skied the gully to the left and hit a big rock. I decided to ski cut the top of the convex on my way over to ski the right gully. A previous skier had hit rocks and ski cut the same convex before me (we could see his track) while apparently changing his mind on which gully to ski. I was actually ski cutting above his track and sort of bouncing to put a bit of extra weight on it when the top 8 inches broke 30 feet wide on the convex and ran down 200 feet through the trees below and uncovering rocks. I happened to catch most of it on video.

Having a look at the crown I found: 3" of fist density on top of a 1/2" crust that gave way to 4 finger density for about 4 more inches until the weak layer of small to medium fragile facet snow on which it ran (updated thanks Brett! - see updated photos below).

Forecaster Note: I visited this avalanche on Dec 19. The "buried hoar flakes" that Matt referred to were small to medium sized buried facets. I was not able to identify any surface hoar in the crown or flank. I've attached a couple of photos below of the grains that acted as the weak layer. Kobernik