On this day in the Gopalganj District, in central Bangladesh, the heaviest hail in recorded history fell. The hailstones, some weighing one kilogram, killed as many as 92 people. Hail is formed in clouds called cumulonimbus, especially when there is an upward motion of air. Specifically, such a flow raises the icy grains up several times, and each time the hailstone becomes larger by getting a new layer of ice.
When the hailstone becomes too heavy to be lifted, it falls to the ground. The bigger the hailstone, the greater is its velocity. Hailstones weighing one kilogram can thus exceed the speed of 200 kilometers per hour, making them deadly indeed.