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Which cloud marks the top of a thermal?

  • A.Altocumulus lenticularis, which forms at the crest of a standing wave in the lee of a mountain barrier
  • B.Cumulus
  • C.Stratus, which forms as a uniform sheet where a stable layer is lifted gently over a broad area of terrain
  • D.Cirrus

Answer: B

A thermal reaching its lifting condensation level produces a cumulus cloud, so the cloud marks the top of the rising column and is the visible signature glider pilots use to locate lift. Stratus indicates a stable layer, cirrus is high ice cloud, and lenticular cloud marks wave lift rather than thermal lift. Each cloud type indicates a different kind of vertical motion. Most errors here come from carrying a result across from a neighbouring case where it does not hold.

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