Discussion
Which quadrant of a jet exit region shows upper divergence in the north?
Answer: C
Air leaving the jet core decelerates and becomes supergeostrophic, so the ageostrophic component points towards high pressure, giving divergence in the left exit quadrant. Together with the entrance pattern this produces a thermally direct circulation at the entrance and an indirect one at the exit. The four quadrant model is one of the most used diagnostics in operational forecasting.
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