So basically, this creates some snowballs high in the sky after you've already made it snow, and then sends them down on the enemy. If you make a hand seal, you can combine the snowballs into one, which I can only assume is four times the size of any of the individual snowballs.
Now I do have a couple questions here. This is B-Ranked, but the description never really says how much damage these things can do. The way it's worded, they seem like regular old snowballs to me. You never stated that their particularly dense or anything like that. So what kind of damage do they do? Also, if I were to shape them into spikes, would they puncture people? Do they make any sound as they come down?