Looks like it was triggered by a snowmobile, just at the break of the ridge, Last weeks observations found that the old snow had faceted and we got a release of the of a small slab, much the same.

FORECASTER NOTE:  This may have been snowmobile triggered or may have released naturally.  I saw a similar cornice fall that fell naturally from recent wind loading.  However, I also experienced a collapse of the snowpack under my machine in a drifted area.  The collapse was due to the new drift sitting on old faceted (sugary) weak snow.  Brett Kobernik