Observation: Park City Ridgeline

Note pooling above crusts. Pooling and possible wet slab release is commonly noted above crusts or as it develops percolation columns through the slab and pool - moving laterally - across weaker, perhaps coarser grained layers. Even if snowpack is isothermal, a structured snowpack may still act as a dry one regarding fracture mechanics. Facets may be collapsed beneath crusts and propagate.

You'll see pooling in the first film and no alarming results with the second one.