I was curious as to the speed of hail. Can you tell me the average speed of hail when it is about the size of a golf ball?
This took some calculating, which I won't
bore you with. I calculated the terminal
fall velocity of an ice sphere the size of
a golf ball (1.68 inch diameter); it is
1626.5 cm per second (234.7 miles per hour).
This is assuming that the hail is a perfect
sphere, which it rarely is. Normally hail
is gouged out on the top and enlarged on the
bottom. More rime collects on the bottom
than the top as the hail falls.
meteorologist at Argonne Nat. Lab.
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Update: June 2012