During a hailstorm balls of ice called hail fall to the ground. Hailstorms often happen during thunderstorms. As rain falls, it pulls air down with it. The downward draft of air may turn upward again. This causes the rain to churn around in the clouds. Some of the rain may freeze to form hail. The hail grows so heavy that it falls to the ground.If you get hit by hail it hurts really bad.