Avalanche on Stevens Peak

Today two skiers were skiing Comma on the east face of Stevens Peak. We climbed up the south east ridge to lookers left of the peak. The weather was clear, calm, some warming, and moderate wind. There was some evidence of wind transport on the ridge we climbed but the wind was calm on the summit. No evidence of wind transport or wind loading into Comma. The first skier ski cut the line from the top, skiers right to left, had no results and continued to ski through the line with minimal sluff or snow movement. The second skier started a little lower on the skiers left side and made a cut across the top as well, made a couple of turns. At the top of the relatively most narrow and most steep part of the slope, the second skier triggered a slide breaking at her skis. It did not catch the skier and she held her position above the rocks and watched it propagate to skiers left and skiers right around the rock bands. The avalanche broke at the old snow new snow interface. The bed surface at the trigger point was the recent rain layer, however the remaining bed surface was softer snow compared to the rain layer. It propagated 300' wide with a crown of 4-9". Ran approximately 150'. D1.5 that it would have certainly entrained a person, probably not have fully buried them. Elevation appx 9800'