Discussion
Which construction gives the upper level wind from the surface wind and the thickness field?
Answer: B
Since the thermal wind is by definition the difference between the two geostrophic winds, adding it as a vector to the lower one recovers the upper one. Drawing this triangle on a chart was the standard method of estimating upper winds before routine upper air observation, and it remains a useful check. The other constructions have no basis in the relation and would give wrong answers in both magnitude and direction. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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