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Here in Arkansas, we had some pretty nasty rain tonight. A few grad
students and myself were sitting around watching the lightning and the
rain after a cookout. Why does the rain come down in sheets came up.
The best we could come up with was that the larger rain droplets reach
terminal velocity and cause a wave-like disturbance in the wind from the
storm and other droplets get caught in this initial phase. Much like the
Bernouli demonstration, the smaller droplets get pulled into the area
behind the larger drops because of the reduced pressure.