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Which comparison makes precipitable water most useful?

  • A.Comparison with the climatological normal for that date and station
  • B.Comparison with the total rainfall recorded at the station during the preceding twenty four hour period
  • C.Comparison with the freezing level
  • D.Comparison with the value observed at the same time on the previous day, which indicates the trend over time

Answer: A

An absolute value means little without knowing what is normal, since 25 millimetres is exceptional in Britain and unremarkable in Florida, so the departure from the local climatology is what carries the signal. Percentiles of the historical distribution are the standard presentation. The same principle applies to almost every environmental parameter used in severe weather forecasting. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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