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Which analysis level is preferred over mountainous terrain?

  • A.Mean sea level pressure, which remains the most reliable field even where the terrain rises steeply above it
  • B.500 hectopascals
  • C.1000 hectopascals, which lies close enough to the surface for the reduction to introduce very little error
  • D.850 hectopascals

Answer: D

The 850 hectopascal surface lies at about 1.5 kilometres and is above most of the terrain in many regions, so contours of its geopotential height give a fictitious-column-free analysis of the low level flow. Sea level and 1000 hectopascal analyses both require the problematic reduction. The 500 hectopascal level is used for the mid-tropospheric flow rather than for low level analysis. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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