Above treeline observation on Mt Shasta

Total height of snow unknown, could not hit ground. Overall, soft and smooth snow surface conditions above treeline. Isolated sastrugi and erosional features in windy locations, ridgelines, etc. I did not view any super recent avalanches, although at some point during this past week, the entire east aspect of Green Butte came down, likely a soft wind slab or storm slab combo. Debris was piled up and visible from about 9,000 feet down to 8,400 feet, approx. Skiing and riding conditions were superb. A few bold folks center punched Sun Bowl. The snowmobilers were a safer bunch today and kept riding on lower angle slopes. The main goal today was to take a look at above treeline terrain and assess wind slab formation, distribution and sensitivty. Overall, moderate avalanche danger was observed. At my snow profile location, about a 35cm hard wind slab sat on top of lighter density snow. It was at this density change where all failures within tests took place.Moderate to hard failures produced clean shears at this layer within small and large column stability tests, however full propagation on a slope scale I feel would be tough, though not impossible. Multiple riders on a slope or near the edge of a wind slab could potentially trigger a hard wind slab.