I viewed this avalanche from a distance today around noon. It appears it was triggered by a snowmobile based on all the recent tracks and lack of significant weather to act as a natural trigger. This path is a repeater and has release at least twice this season. People who were in this area yesterday did not observe the avalanche, which leads me to believe it occurred this morning of late yesterday.
The sled track in the crown here was made earlier this week. It is slightly drifted in by wind blown snow.
Below is a photo of the second time this avalanche ran this season which was on Dec 23.