Puzzling Weather

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Hail is created by strong updrafts, typically in thunderstorms. Small hailstones have a soft center and a single outer coat of ice. Large hailstones usually alternate between hard, clear layers (made of solid ice, these layers form when the hailstone encounters moisture that spreads across the stone before freezing) and softer, milky layers (these form in a colder environment as moisture freezes on contact, trapping tiny air bubbles as it freezes). © University Corporation for Atmospheric Research, Photo by Carlye Calvin. Want to know more about thunderstorms? Go to JetStream - an Online School for Weather.

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