Pretty large assuming natural (no skintrack heading above where we dropped) new snow slide in the E facing bowl behind west porter. Probably triggered from high PI. Stopped in the trees to shoot a photo of my buddy and saw a lot of snow moving about 50ft to my left. Visibility was poor but from the debris piles looked like most of the bowl had slid, roughly 600ft from a caltopo measure. Triggered another 10 or so small soft slabs on our way out porter, just about every little roll or test slope would crack and get some snow moving. Roughly 8" of new snow above 8500' and was still dumping 1-2"/ hour on our exit at 1pm