This evening I was traveling up a northwestern facing, 29 degree slope at 6200’ and triggered a D1 avalanche. Lower angle terrain existed above me, but steeper slopes existed to the west and northeast. No obvious signs of instability were observed prior to the slide. Old, faceted snow from the October and early November storms did not exist.
My intent was to ski a western facing aspect from middle elevation. The safest uptrack was on the north side of the compass, through low angle terrain. From my observation, the snowpack failed on interface between this weeks and last weeks storm. The crown ran 60-80’, broke far above me, and was 10”-12” deep. The slide ran ~200’ on a clean bed surface, but did not hit the valley floor. This happened after dark, so photos were nearly impossible to take. Skies were overcast, winds calm.