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Hailstones larger than about which diameter are conventionally classed as severe?

  • A.10 centimetres
  • B.0.5 millimetres
  • C.2 centimetres
  • D.2 millimetres

Answer: C

Thresholds vary between national services but lie around two centimetres. Damage to property and crops rises very steeply above that size. Stone size correlates directly with updraught strength. Warnings are issued on stone size for exactly that reason.

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