White Pine, Maybird Apron Obscured; ie., low hanging cloud Maybird Apron, NNE, skiers left; starting zone 8600' (~250' down from the ridge), 37 degrees, 10 to 20" deep, ran 400', 2pm. As I was decending, in the fog, I noticed the snow, to my left and down, moving. Not real fast; but, there was some large blocks coming to rest. I veered right into a small tree stand and then continued the run--to the right. At the bottom we veered back to the left and notice the tow of the slide at around 8200'. No collapsing; but some minor cracking in the adjacent area. Could not see the starting zone; but generally the snow was wind and sun effected punchy snow. No new snow. Did not stop to investigate. The slide was in an open area, up toward the ridgeline. I guess we found a pocket.