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Which pressure does the standard atmosphere give at 5.5 kilometres?

  • A.About 850 hectopascals
  • B.About 300 hectopascals, which is close to the level at which the jet stream core is generally found
  • C.About 500 hectopascals
  • D.About 700 hectopascals, which is the level often used for examining vertical motion and cloud in analyses

Answer: C

The 500 hectopascal surface lies near 5.5 kilometres in the standard atmosphere, with half the atmospheric mass beneath it. The 700 hectopascal surface is near 3 kilometres and the 850 near 1.5. Memorising the approximate heights of the standard analysis levels makes it far easier to interpret a chart without consulting a table. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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