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Which quantity does the equilibrium level indicate?

  • A.The height at which the environmental lapse rate first becomes less steep than the moist adiabatic value
  • B.The approximate height of the anvil top
  • C.The base of the cloud, which is where the rising parcel first becomes saturated during its ascent upward
  • D.The level of free convection

Answer: B

At the equilibrium level the parcel temperature equals that of the environment again and the buoyancy vanishes, so the updraught decelerates and spreads out to form the anvil. Overshooting tops rise above it through momentum. The cloud base is the lifting condensation level, which lies far below, at the lifting condensation level. Reading the two levels off a sounding together gives both the cloud base and the cloud top in a single operation.

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