Discussion
Which thickness value marks the traditional rain and snow boundary over lowland Britain?
Answer: D
The 540 decametre contour of the 1000 to 500 hectopascal thickness is the classical rule of thumb for the rain and snow boundary at low levels. It is only a guide, because the distribution of temperature within the layer matters as much as its mean, and a shallow warm layer can melt snow that a bulk value would predict. The 528 value is genuinely used as a stricter threshold, which is why it makes a plausible distractor. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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