Water falling from the sky is hard to believe if you had never seen it. What is even weirder, is hail. Chunks of frozen water, the size of softballs or even cantaloupes that weigh over a pound.
The largest officially recognized hailstone on record to have been 'captured' in the U.S. was that which fell near Vivian, South Dakota last summer (2010) on July 23rd. It measured 8.0” in diameter, 18 ½” in circumference, and weighed in at 1.9375 pounds.
It is estimate the winds have to blow straight UP at 300+ MPH for that to stay in the air and get bigger.