Discussion
Which quadrant of a straight jet streak entrance favours ascent in the northern hemisphere?
Answer: D
In the entrance region the flow accelerates and becomes subgeostrophic, so the ageostrophic component points towards low pressure, producing convergence aloft on the left and divergence on the right. Divergence aloft implies ascent below, so the right entrance is the favoured quadrant. The exit region reverses this, giving ascent in the left exit. Learning the four quadrants as a consequence of acceleration rather than as a picture makes them easy to reconstruct. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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