Discussion
Which combination is most favourable for supercell development?
Answer: B
Supercells require both a deep-layer shear of roughly 20 metres per second and enough buoyancy to sustain a vigorous updraught, since shear without instability gives no storm and instability without shear gives only short-lived pulse cells. The shear ultimately comes from the thermal wind of the baroclinic environment, which is how this large-scale relation reaches down into the forecasting of individual storms. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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