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Which thickness value is often used as a rain and snow guide in mid-latitudes?

  • A.540 decametres
  • B.500 decametres, which corresponds to a layer mean temperature well below freezing at every level
  • C.570 decametres
  • D.1000 decametres, which is close to the thickness of the whole troposphere in the tropics at midday

Answer: A

The 540 decametre contour of the 1000 to 500 hectopascal thickness is the traditional rule of thumb for the rain and snow boundary over lowland Britain. It is only a guide, since the temperature profile within the layer matters as much as the mean, and the value varies with altitude and with the depth of any warm layer. Using it as an approximation while understanding why it is only approximate is the right approach. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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