Discussion
Which wind is read from the spacing of those contours?
Answer: C
Contour spacing gives the geopotential gradient and hence the geostrophic wind, with the Coriolis parameter supplying the latitude dependence. The gradient wind requires an additional correction for curvature, and the thermal wind is obtained by comparing two charts. Reading wind speed from contour spacing is the fundamental skill of upper air analysis. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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