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The strength of the updraft within a storm determines how large hailstones can grow and be lifted. Stronger updrafts (upward winds) are needed to lift larger hailstones. Specifically, winds of 64 mph can support a golf ball-sized hailstone, while grapefruit-sized hail requires updrafts near 100 mph. The updraft also plays a role in how long the hailstone stays in the freezing air, allowing it to accumulate more ice and grow large
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