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Which effect does the lee slope have on the vertical motion?

  • A.It has no effect
  • B.It produces alternating ascent and descent whose wavelength is set by the width of the barrier itself
  • C.It forces descent and produces a rain shadow
  • D.It forces further ascent because the flow continues to be deflected upward beyond the crest of the range

Answer: C

Descent on the lee slope warms the air adiabatically and evaporates cloud, giving the rain shadow characteristic of the downwind side of every major range. Trapped lee waves do produce alternating vertical motion downstream, which makes the last option partly true, but their wavelength is set by the stability and wind profile rather than by the mountain width, and the immediate lee slope effect is simple descent. The shared properties explain why these belong to one family, and the differences explain why more than one exists.

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