The slide was located in the South-facing vicinity of Chair Peak, near the uphill track to Snow Lake descents. This avalanche was the only outward evidence of instability. The air temperature remained cold but there was typical spring radiation. (Sunscreen weather). The avalanche looked like a WL but probably initiated due to wind loading up high. The snow on the direct South facing aspects was warming up during the afternoon. A compression test at 4900ft. South-facing revealed a Hard to initiate fracture 38 cm deep. (CTH 20) The snowpack appeared generally stable to skiing and cuts.