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Which assumption does the pressure-wind relationship rest on?

  • A.The storm is stationary so that the trajectory curvature equals the streamline curvature exactly
  • B.The storm is symmetric
  • C.The storm has a well defined eye within which the wind falls almost to zero at the very centre
  • D.The storm is approximately in gradient wind balance

Answer: D

The relationship follows directly from assuming balance between the radial pressure gradient and the sum of Coriolis and centrifugal forces. Symmetry and steadiness improve the accuracy but are secondary, and a well defined eye is a feature of intense storms rather than a requirement. Departures from balance during rapid intensification are exactly why observed winds sometimes exceed the value the relationship predicts. The shared properties explain why these belong to one family, and the differences explain why more than one exists.

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