It thawed all of yesterday .. temps above 32 .. and the gable end of our roof had 9+ inches of wet heavy wind blown snow on it.
For evening feeding, I stepped out on the porch knowing I was "running the gauntlet" and I prayed and was told to go ahead and I did. Two minutes later it let loose and I had to climb over the rubble to get back into the house.
The roof area that slid was 12x30 time five pounds per sq. ft. equals 1,800 pounds of snow. Divide that by 30 and multiply by two and that represents the weight of the two feet that would have struck me doing what .. 10 mph .. 120 pounds. Survivable but not pretty.