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A hailstorm is a weather phenomenon characterized by the formation and falling of hailstones. Hailstones are solid ice pellets that form within thunderstorm clouds when there are strong updrafts of air. These updrafts carry raindrops upward into extremely cold areas of the cloud, where they freeze into ice pellets. As the ice pellets are lifted by the updrafts, they accumulate layers of ice, growing in size. Hailstones can vary in size, ranging from tiny pellets to large chunks several inches in diameter. The size of hailstones depends on the strength of the updrafts and the amount of moisture present in the storm cloud. Larger hailstones are typically associated with more severe storms. When the hailstones become too heavy for the updrafts to support, they fall to the ground. The falling hailstones can cause damage to buildings, vehicles, crops, and other structures. Hailstorms can also pose a danger to people and animals caught outdoors, as the impact of large hailstones can cause injuries. Hailstorms are most common in areas with a suitable combination of atmospheric conditions, such as strong updrafts, cold temperatures aloft, and abundant moisture. They are often associated with severe thunderstorms, which also produce strong winds, heavy rain, and lightning. Hailstorms can occur in various parts of the world, but they are more frequent in certain regions, such as the central United States, known as "Tornado Alley." To stay safe during a hailstorm, it is important to seek shelter indoors and avoid windows, skylights, and other glass surfaces that could shatter due to the impact of hailstones. If caught outside, it is advisable to seek cover under a sturdy structure or inside a vehicle, if available.