Many of us have experienced hail storms at some point. Maybe you were at work or home when it happened. Perhaps you were out on the roadways running errands. Hail storms consist of balls of ice. They are often short-lived, lasting for fewer than 15 minutes. Many produce pebble-sized hail, but you have probably heard of hail the size of golf balls. This type of hail can be dangerous to buildings, cars, and other objects. While rare, massive hailstones can cause concussions and even fatal head injuries.