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Which cloud marks the crest of a trapped lee wave?

  • A.Altocumulus lenticularis
  • B.Cumulonimbus, which develops where the ascending branch of the wave lifts air beyond its level of free convection
  • C.Stratus
  • D.Cirrus uncinus, whose trailing ice crystals indicate strong vertical shear at the level where they form

Answer: A

Lenticular cloud forms in the ascending part of each wave crest and dissipates in the descending part, so it appears stationary while the air moves through it. The clouds mark the wave train clearly from the ground and from satellite. Deep convection requires conditional instability rather than wave lifting, and the other cloud types have no particular association with lee waves. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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