Skiing into the Smiley Creek drainage at 8500' on a NE aspect on a 35 degree slope, I triggered a D2 soft slab. The slab broke on an open slope and was approximately 150' wide, ran 200' and was 6-10" deep. The bed surface was a slick crust with weak sugary snow on top of it, there was another crust and then then the current storm snow. The slab failed on the weak sugary snow. When I stepped on a chunk of the hang fire the slope fractured again and propagated past the original flank.
Signs of Unstable Snow
I was on the lookout for Wind Slab and Loose wet. We did not observe any signs of instability while traveling. My avalanche radar was not pinging, I was vey surprised to trigger this slab.