Conices building and lipping - very sensitive. After cutting cornice at end of cat trak and getting good results (75' wide 500' vert. The next chute west, past the peak (end of normal traverse) had a very large overhanging conice >15'. I skied down and 5' back from normal 'safe' zone attempting to test the cornice from what I thought was a prudent distance - turned out to be off by half a foot, downhill ski dangled into moving/falling conice. I managed to lean over to S side and avoid the pull into the slide. N chutes loading up to 2' this slide ran better than 500' Incidently notice a slide off catherdral area running below C-rock vacinety