Not even sure what to call this. Down near the bottom of Lawnmower was this heavy fracture. Several feet deep but no obvious avy debris beneath it. Seems to be from snow sitting on a rock slab that had slid...? The upper portions of Lawnmower didn't exhibit warning signs (cracking, etc.). And this was near the bottom. Really not sure but figured the UAC magicians would have a theory.

Forecaster note: Could be some weird glide avalanche. Hard to say without visiting the site.