Got to the top of flagstaff ridge and witnessed two snowboarders descend down Two Dogs into Days Fork. First boarder hugged the trees on the skiers left of the main run and had a clean run to the basin. Second boarder cut a bit skiers right into a wind loaded run and immediately set off the slab. They took a few more turns and cut left, avoiding the bulk of the slide. They made it safely to the bottom without getting caught. The slide ran for about 200 feet.

From the party that triggered the avalanche (KL)

After watching a group safely descend Upper Days, my buddy dropped in to Two Dogs & rode out safely. I dropped in next, further skiers right into slightly steeper terrain. On my 2nd turn I triggered the edge of a large wind slab . Fortunately I was able to ride out & veer skiers left out of the slide path. It picked up some speed part way down the slope & ran a few hundred feet, definitely large enough to catch & carry. The avy report was dead on this morning & in hindsight given the wind slab risk & strong winds on the ridge, we should have stuck to lower slope angles.