<ul><li>A new study challenges the conventional wisdom that hailstones form through repeated trips up and down through a storm.</li><li>Researchers found that most hailstones grew without any reversal in direction, with only a small number experiencing multiple cycles.</li><li>Hailstones larger than 25mm in diameter were observed to have at least one period of growth during lifting.</li><li>While smaller hailstones may not cycle in a storm, the largest hailstones typically climb at least once before descending.</li></ul>

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