Hail is water that gets caught in strong upward moving winds. The water will freeze, then start to fall, with more water attaching to the hailstone. This can get sent back up into the freezing air several times. Each time it goes up, a layer of ice is formed. Once the hail is too heavy or the strong upward winds weaken, the hail will fall to the ground. While most hail is small, some hailstones can be as big as softballs.
