When does it hail?
Hail begins as a drop of water falling toward earth. In conditions that produce hail, rain clouds and such, there are areas were the wind blows downwrd and also upward producing very turbulent conditions. There is very cold air in the upper atmosphere. As a drop o rain(mostiure) falls, it is caught by updrafts of air and pushed high up into the very cold air and the outside of the mosture crytalizes into ice. This may occur a few or many times and the number of times the drop returnsto the upper atmosphere determines the size of the hail, for each time the drop travels upward more ice forms and the drop increases in size, until finally there is so much ice attached until gravity takes over and pulls the drop, which is now what we know as hail, down and out of the effect of updrafts and it falls to earth. In every piece of hail there is the minute drop of water that developed into he ball of ice we know as hail.