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Which local wind results from flow forced through a gap in a barrier?

  • A.A katabatic wind, driven by the drainage of radiatively cooled air down a slope during the night hours
  • B.A gap wind
  • C.A foehn wind, which is instead the warm dry flow that descends the lee slope after crossing the crest
  • D.A sea breeze

Answer: B

Blocked flow accelerating through a gap can produce winds far stronger than the ambient flow, and such gap winds are a recognised hazard in fjords, straits and mountain passes. The foehn descends the lee slope after crossing the crest, while sea breezes and katabatic winds are driven by thermal contrasts rather than by dynamical channelling.

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