Discussion
Which wind does an isobaric chart most directly give?
Answer: A
Contours of geopotential height on a constant pressure chart give the geostrophic wind directly through their spacing and orientation, which is why such charts are drawn in the first place. The gradient wind requires additional knowledge of the trajectory curvature, and the actual wind requires observations. The thermal wind is obtained by comparing two charts at different levels rather than from a single one.
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