Discussion
Which correction must be applied to read the gradient wind from a chart?
Answer: B
The geostrophic value read from contour spacing must be reduced where the flow curves cyclonically and increased where it curves anticyclonically, and gradient wind scales built into plotting tools do exactly this. Latitude is already taken into account by the geostrophic scale itself, friction is irrelevant above the boundary layer, and density does not appear at all when pressure is the vertical coordinate.
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