Discussion
Where does air leaving a northern hemisphere jet core rise?
Answer: A
Air leaving the jet core decelerates and becomes supergeostrophic, so the ageostrophic component points towards high pressure, giving divergence aloft on the left and hence ascent beneath. The entrance region has the opposite arrangement. Together the two produce the characteristic pattern of a direct circulation at the entrance and an indirect one at the exit, which is the standard picture in every synoptic textbook.
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