Discussion
Which practical hazard does that instability produce near the jet stream?
Answer: D
Strong shear near the tropopause can reduce the Richardson number below the critical value, producing Kelvin-Helmholtz billows in cloud-free air that give sudden severe turbulence with no visual warning. It is a significant cause of in-flight injury. Icing requires cloud, ash requires an eruption, and wake vortices are generated by aircraft rather than by the atmosphere. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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