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How does hail form?

Hail con­sists of wa­ter droplets which freeze. Pow­er­ful up­drafts cause these "nu­cle­ation sites" to col­lide with su­per­cooled rain drops in the cloud, and so the hail­stones grow. When the hail­stone is suf­fi­ciently heavy, it will fall out of the cloud and ruin your veg­etable patch. And car.

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