Discussion
Consider the following statements about orographic lifting.
1. Precipitation tends to fall on the windward slope.
2. Descending air on the lee side warms and dries.
3. The air returns to its original temperature after descending.
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: the air is cooled as it rises and precipitates on the windward slope, and it warms and dries as it descends the lee. Statement 3 is wrong and is the whole point of the foehn effect - the air ascended partly at the saturated rate but descends entirely at the dry rate, so it arrives at the original level warmer and much drier than it began. That asymmetry is what produces a rain shadow.
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