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Which cloud results from convection confined beneath an inversion?

  • A.Cumulonimbus reaching the tropopause, since the inversion concentrates the buoyancy into a narrower column
  • B.Stratus
  • C.Altocumulus castellanus, whose turreted appearance indicates instability at a level well above the surface
  • D.Shallow cumulus with a flat top

Answer: D

An inversion caps the ascent, so the cloud spreads laterally at that level and develops the flattened top characteristic of fair weather cumulus beneath a subsidence inversion. Deep convection requires the cap to be absent or broken. Altocumulus castellanus indicates elevated instability and is a genuine sign of potential for later development, which makes it an instructive distractor. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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