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Which sounding shape indicates high potential for damaging downdraughts?

  • A.A profile in which the wind increases steadily with height without any change of direction through the layer
  • B.An inverted V with a deep dry layer beneath a high cloud base
  • C.A saturated profile from the surface to the tropopause, giving the greatest possible depth of precipitation
  • D.A shallow moist layer

Answer: B

The inverted V is produced by a deep dry adiabatic layer with a large dew point depression, so precipitation falling into it evaporates and drives a strong downdraught. It is characteristic of the high plains in summer and of dry microburst environments. A saturated column removes the evaporative cooling entirely and is the least favourable case.

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