2:00pm on March 14 2012, we watched two skiers traverse from west to east on the upper ramparts of the Y Couloir, which triggered a good sized wet slab. Albeit, I thought it was sluff at first glance, but then it was apparent this was a lot more than just "some sluff". I managed to get the camera turned on and focused as the slide wrapped around the bottom stage of the couloir. Crown depth is unknown, crown width is unknown. I do know that this slide ran it's full 3200'+ course. After the slide had settled, I noticed two other remote pockets that broke loose and funneled in. As said by a passerby; "...Personally, I can think of a few better things to do at 2:00pm, than to be at the top of the Y Couloir in near 60º temps."