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Which cloud indicates instability at mid-levels?

  • A.Altocumulus castellanus
  • B.Stratocumulus, whose layered form indicates that the convection is confined beneath a strong capping inversion
  • C.Cirrus
  • D.Nimbostratus, whose continuous precipitation indicates deep and widespread ascent within a frontal zone

Answer: A

Turreted altocumulus shows that a layer at mid-levels is convectively unstable, which often precedes thunderstorm development later in the day. Forecasters treat a morning sky of castellanus as a warning sign. Stratocumulus and nimbostratus indicate stable and frontal conditions respectively, and cirrus says little about instability at all. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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