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Which feature forms downstream of a major mountain range as a result?

  • A.A stationary front, formed where the deflected flow meets the undisturbed current beyond the barrier
  • B.A lee trough
  • C.A ridge, because the flow descending the lee slope warms adiabatically and raises the pressure there
  • D.A closed anticyclone

Answer: B

Stretching of the column on the lee slope generates cyclonic vorticity, producing the semi-permanent lee troughs east of the Rockies and south of the Alps. These are preferred regions of cyclogenesis for exactly that reason. Adiabatic warming does occur but the vorticity argument dominates the flow pattern, and neither a closed anticyclone nor a front is the characteristic feature.

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