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Which sounding feature indicates the potential for large hail?

  • A.A deep saturated layer extending from the surface to the tropopause with no dry air anywhere in the column
  • B.A low lifting condensation level
  • C.A strong capping inversion that persists throughout the day and prevents convection from initiating at all
  • D.Large available potential energy with strong deep layer shear

Answer: D

Hail growth requires a strong sustained updraught to keep the stone aloft in the growth layer, and that requires both buoyancy and the shear to organise a persistent storm. Deep saturation would reduce the buoyancy by warming the mid-levels. A persistent cap prevents any storm at all, which is the opposite of the condition required.

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