I was skiing solo and was noticing isolated spots where the storm slab was very reactive, and other spots that were just sluffing. On my second lap I skied down about 600' and looked back and saw a big cloud of snow chasing me down, I cut hard left out of it's path, I estimate it ran about 500', possibly longer. I expect any instabilities on solar aspects to settle by 2/23, the reactive slabs seemed very isolated.