HOW BIG CAN HAILSTONES GET?

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Everyone knows that it doesn't take a large hailstone to cause much damage. But out of curiosity, how big can hailstones get?

While most hailstones are the size of peas (about 0.25 in [0.63 cm] in diameter), they sometimes grow larger than softballs. Large hailstones have been responsible for destroying crops, breaking windows, and denting cars, and have caused the deaths of many people and animals.

Hail causes nearly one billion dollars (U.S.) in damage to property and crops annually. The costliest United States hailstorm: Denver, Colorado, July 11, 1990. Total damage was 625 million dollars (U.S.). Hail falls when it becomes heavy enough to overcome the strength of the updraft and is pulled by gravity towards the earth. How it falls is dependent on what is going on inside the thunderstorm. Hailstones bump into other raindrops and other hailstones inside the thunderstorm, and this bumping slows down their fall.

Drag and friction also slow their fall, so it is a complicated question! If the winds are strong enough, they can even blow hail so that it falls at an angle. This would explain why the screens on one side of a house can be shredded by hail and the rest are unharmed! Hail is a form of precipitation that occurs when updrafts in thunderstorms carry raindrops upward into extremely cold areas of the atmosphere where they freeze into ice.

The National Climate Extremes Committee, which is responsible for validating national records, formally accepted the measurements for the largest hailstone ever to fall in the U.S.: seven inches in diameter (17.8 centimeters) and a circumference of 18.75 inches (47.6 centimeters). The old record for the largest hailstone had a diameter of 5.7 (14.5 centimeters) inches, a circumference of 17.5 inches (44.5 centimeters), and was found in Coffeyville, Kansas, on September 3, 1970. The previous longstanding record was believed to be a hailstone which fell at Potter, Nebraska on July 6, 1928. It measured around 7 inches (17.8 centimeters) in diameter and weighed about 1.5 pounds (680 grams).

The largest hailstones ever reported, weighing up to 7.5 pounds (3.4 grams), fell in the state of Hyderabad, India, in 1939. However, scientists believe that these huge hailstones may have been several stones that partially melted and stuck together. On April 14, 1986, hailstones weighing 2.5 pounds (1 kilogram) each were reported to have fallen in the Gopalgang district of Bangladesh.

Clearly hailstones can become quite large given the right meteorological conditions. All of which begs the question, with the current environmental changes occuring...can we expect hailstones to get heavier and larger as the years roll on?

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