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Which sounding feature favours damaging downdraughts?

  • A.A deep dry layer in the mid-troposphere
  • B.Saturation through the whole depth of the troposphere so that no evaporation can occur within the downdraught
  • C.A low cloud base
  • D.Very weak wind shear through the layer between the surface and the level of the storm top above it

Answer: A

Precipitation falling into a dry mid-level layer evaporates, cooling the air and accelerating the downdraught, which is the mechanism of a dry microburst. An inverted V profile on the sounding is the classic signature. Deep saturation removes the evaporative cooling entirely and is therefore the least favourable condition.

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