The fist hitting the water, then fingers splayed out in a "Rolling puff" as the air comes rolling down from above while advancing.
I actually saw this happening on a bright sunny blue morning at Lake Louise, Canada- there were light snow crystals being driven down to the water with the rolling puffs coming from the other end of the lake. It looked just like the Fist and Splaying Fingers: I had read about this but until made visible, it's hard to imagine as real. Dang- No video camera!