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Which quantity does a rain gauge network on a windward slope typically show?

  • A.A maximum of rainfall at the crest of the range with rapid decreases both upwind and downwind of it
  • B.A steep increase of rainfall with elevation
  • C.A uniform rainfall total across the slope because the ascent is spread evenly through the whole depth
  • D.A decrease of rainfall with elevation

Answer: B

Forced ascent increases with the steepness of the slope and with the depth of moist air lifted, so rainfall commonly doubles or triples between the foot and the upper slopes of a range. The maximum often lies slightly upwind of the crest rather than at it, because hydrometeors take time to grow and fall. A decrease with elevation occurs only in the rain shadow beyond the crest.

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