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Which limitation does that thickness rule have?

  • A.Thickness cannot be computed in mountainous terrain where the lower pressure surface lies below the ground
  • B.It applies only in summer
  • C.It requires a radiosonde ascent at the precise location for which the precipitation forecast is being made
  • D.A shallow warm layer aloft can melt falling snow

Answer: D

Thickness is a mass-weighted mean, so it conceals the vertical distribution, and a warm nose only a few hundred metres deep can turn snow into rain or freezing rain. Examining the full profile is always preferable. The computation over high ground does involve a fictitious layer, which makes that a genuine secondary difficulty rather than a wholly wrong answer. The shared properties explain why these belong to one family, and the differences explain why more than one exists.

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