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Which relationship holds between precipitable water and observed rainfall totals?

  • A.Rainfall equals the precipitable water multiplied by the efficiency of the precipitation process in the cloud
  • B.Rainfall can greatly exceed the precipitable water present
  • C.Rainfall can never exceed the precipitable water, since that is all the moisture the column actually contains
  • D.The two are equal

Answer: B

Low level convergence continually feeds new moisture into a storm, so a system can produce several times the precipitable water of the column it occupies. Moisture flux convergence rather than the standing moisture content is what determines the total. This is why the quantity is used as an environmental indicator rather than as a quantitative forecast of accumulation.

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