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Which limitation does the thickness rule for precipitation type have?

  • A.A shallow warm layer can melt falling snow
  • B.Thickness cannot be computed reliably in mountainous regions where the surface pressure varies greatly
  • C.It applies only in winter
  • D.It requires a radiosonde ascent at the exact location for which the forecast is being prepared

Answer: A

Thickness is a mass-weighted mean, so it conceals the vertical distribution of temperature, and a warm nose only a few hundred metres deep is enough to turn snow into rain or freezing rain. Examining the full profile is therefore always preferable. Thickness is computable anywhere the analysis extends, and while the rule is used mainly in winter that is a matter of relevance rather than validity.

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