Discussion
Which situation makes the geostrophic approximation poor even in mid-latitudes?
Answer: B
A small radius of curvature makes the centrifugal term comparable with the other two, so the Rossby number rises and gradient wind balance must replace geostrophic balance. Broad weak systems and straight flow are precisely where geostrophy works best. Alignment of contours with isotherms says something about the thermal wind rather than about the validity of the geostrophic approximation at a single level.
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