Discussion
The foehn or chinook wind is
Answer: A
Correct answer: a warm dry wind descending a lee slope
Air that has been lifted over a range, cooled at the saturated rate and precipitated its moisture then descends the far side warming at the *dry* rate, so it arrives warmer and much drier than it began. That asymmetry is what makes the foehn and the chinook remarkable - temperature rises of twenty degrees in an hour are recorded - and it is the mechanism that produces a rain shadow.
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