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Which quantity does the cloud base height indicate about the surface air?

  • A.Its pressure
  • B.Its wind speed, since the depth of the mixed layer depends principally upon the mechanical generation of turbulence
  • C.Its dew point depression
  • D.Its temperature, which determines directly the altitude at which the parcel becomes saturated on ascent

Answer: C

The lifting condensation level rises about 125 metres for each kelvin of dew point depression, so a large depression gives a high cloud base. Temperature alone does not determine it, since a warm moist parcel and a cool dry one can have very different bases. The relationship is one of the most useful rules of thumb in practical meteorology.

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