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Which thickness value is the traditional rain and snow guide over lowland Britain?

  • A.500 decametres
  • B.528 decametres, which is sometimes quoted instead as a stricter threshold applicable at higher elevations
  • C.540 decametres
  • D.570 decametres, which is a value more typical of a warm tropical maritime air mass during the summer

Answer: C

The 540 decametre contour of the 1000 to 500 hectopascal thickness is the classical rule of thumb for the boundary between rain and snow at low levels. It is only a guide, since the distribution of temperature within the layer matters as much as its mean. The 528 value is genuinely used as a stricter criterion, which is why it makes a plausible alternative. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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