Summary: Based off the forecast, my party expected wet loose avalanche risk as the day progressed, however, morning sun, warm temps and new snow overnight created wet slab risk on all north facing slopes that we encountered.
4 inches of new snow fell over night in Crystal area. Skinned to Bullion Basin, reaching the basin at around 10:30am. Snow was expected in the forecast, but instead light rain/sleet from 4800 ft to 5800 from 8:45 to 9:30 to sun appeared from 9:30-11am at 5800ft and above with rapid warming. West facing slopes off of East Peak had small rollerballs. While in the basin we witnessed a natural wet loose side on the N aspect (40-45 degrees). Went up NE slope toward ridge (30-34 degrees) with some evidence of rollerballs. Descended along skin track line (30-34 degrees) and set off small D1 slabs with every turn. Around 12:30pm we witnessed a skier trigger a D2 slab avalanche starting from the peak of Bullion peak on the NE slope (no photo). Also saw skier triggered D1-D2 on NE slope adjacent to skin line.