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Which level does the top of that convergence mark?

  • A.The equilibrium level, at which the ascending parcel becomes cooler than its surroundings and stops rising
  • B.The lifting condensation level and hence the cumulus cloud base
  • C.The level of free convection, above which a parcel rises without any further forcing being required at all
  • D.The tropopause

Answer: B

Where the dry adiabat and the saturation mixing ratio line through the mixed layer properties meet, the air becomes saturated, and thermals reaching that level produce cumulus. This is why fair weather cumulus have such a uniform base across a landscape. The level of free convection lies higher wherever a stable layer must be penetrated first.

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