Discussion
Which hazard does that shear present to aviation?
Answer: D
An aircraft descending through a shear layer experiences a change in headwind that translates directly into a change of airspeed, which must be anticipated and corrected. Low level wind shear alert systems monitor for exactly this. The stable layer is typically smooth rather than turbulent, which is why the hazard is the airspeed change rather than the buffeting. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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