What is Hail damage? Hail damage is any damage resulting from hailstones and hailstorms. Small hail, around 1″ or smaller can fall at speeds of 9-25mph. Larger hail, hail about 2-4″ in diameter can fall at speeds of 40-70 mph and cause some serious damage when striking any object in its path. These high velocity balls cause a wide range of ding & dent sizes to your car’s body, crack or shatter glass, and can even cause interior water damage if they puncture through. In the event you experience significant damage to your car after a hailstorm, report the claim to your insurer as soon as possible, so they can pay to fix your vehicle (s).