Discussion
Which effect does the tilt have on the energy of the disturbance?
Answer: B
A westward tilt with height allows warm air to rise and cold air to sink in a systematic way, converting the available potential energy of the horizontal temperature gradient into kinetic energy of the disturbance. This is the energetic statement of baroclinic instability. An eastward tilt reverses the conversion, which is why decaying systems adopt that configuration and why the tilt is such a reliable diagnostic of the stage of development. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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