You know, I could do the same job with a small RC plane, a small 1000 watt subwoofer scotch-taped to a cd player and drop the thing via remote.
As the thing falls down it begins playing the barbara streissand CD at full volume.
That will get rid of ANY snow.
Total cost: Cheaper than the 105mm shell I bet... and a ton more fun.
The PETA might sue though.