Discussion
Assertion (A): Wind undercatch is the largest systematic error in gauge measurement of snowfall.
Reason (R): Light snow particles are deflected around the gauge orifice by the flow it disturbs.
Answer: C
Both are true and the reason gives the mechanism, and losses can exceed half the true fall in strong wind. Shielded gauges reduce but do not eliminate the problem. Intercomparison experiments have quantified the residual loss.
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