What causes hail to form?



  1. 0 Votes

    Hailstones usually begin forming on seeds of small frozen raindrops or soft ice particles (graupel), and can contain foreign matter such as pebbles, leaves, twigs, and insects that have been blown into the storm by strong updraft winds.  Hail is found in the middle and upper portions of the majority of thunderstorms, yet most hail melts before hitting the ground.  So, in order for the frozen raindrops or graupel to grow into large hailstones, they must accrete additional ice, and so must remain in a supercooled cloud region where temperatures are below freezing.  The size of hailstones generally increases with the storm’s intensity, residence time in the supercooled cloud region, and number of droplets available in the cloud.


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