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Which observation confirms the cloud base estimate?

  • A.A ceilometer measurement of cloud base height
  • B.A radiosonde temperature profile, from which the height of the cloud base may be computed after the ascent
  • C.Satellite imagery
  • D.A radar reflectivity scan, which detects the precipitation falling from the cloud rather than its base

Answer: A

A ceilometer determines the cloud base directly by timing a laser pulse reflected from the cloud, and its readings agree well with the lifting condensation level for convective cloud. A radiosonde gives the saturated layer but only twice a day. Satellite imagery sees the cloud top and radar sees the precipitation, so neither gives the base. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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