Discussion
Which conclusion follows from the gradient wind balance around a high?
Answer: C
Solving the gradient wind equation for anticyclonic flow gives a real root only while the pressure gradient stays below a limiting value proportional to \( f^{2}R/4 \), which is why anticyclones are always broad and gentle while cyclones can be small and intense. The wind around a high is supergeostrophic rather than subgeostrophic, and the curvature is finite. This asymmetry between highs and lows is one of the most striking results obtainable from a simple force balance.
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