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The air a few miles above the ground is always cold enough for water to freeze. Hail starts off as small pellets of ice called graupel in the cold, upper reaches od a thunderstorm. This graupel is cycled through the storm by powerful air currents. As this happens, the pellets collide with supercooled water droplets, in which water remains liquid below its normal freezing point. These droplets freeze instantly to the surface. Hailstones grow by accumulating layers of ice in the manner. Eventually the hail becomes too heavy to remains suspended in the storm and falls to the ground. The hail is large enough and falls fast enough that it does not have time to melt.

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11y ago

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