Hail forms inside clouds when water droplets rise into air that’s below freezing, and freeze. In a thunderstorm they are lifted by an updraft to become ice. The longer the ice stays in the freezing air, the more layers of ice it can gain. Inside a thunderstorm, winds are up, down, and sideways, so hail may be held in place, or juggled, or rise and sink. In the cloud, hailstones can also clump together and then grow more layers of ice to become giant. The stronger the upward wind in a thunderstorm, the larger the hail can grow.
Meteorologist Alan Sealls
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