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Which feature distinguishes the bora from the foehn?

  • A.The bora is saturated
  • B.The bora ascends rather than descends, being driven by the heating of the slope during the daytime hours
  • C.The descending air is cold before it starts to descend
  • D.The bora is warmer at the foot of the slope because it descends through a much greater depth of atmosphere

Answer: C

In a bora, cold continental air spills over a coastal mountain barrier and, although it warms adiabatically as it descends, it arrives still colder than the air it replaces. The foehn by contrast arrives warmer. The distinction lies in the initial temperature of the source air rather than in any difference of mechanism.

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