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Which quantity does gradient wind balance predict for a given central pressure deficit?

  • A.The radius of the eye
  • B.The depth of the layer through which the circulation of the storm extends into the troposphere above
  • C.A maximum sustainable tangential wind
  • D.The rate at which the storm will move across the ocean surface over the following twenty four hours

Answer: C

Given the radial pressure profile and the radius, the gradient wind equation gives the tangential wind that balances it, which is the basis of pressure-wind relationships used operationally. Storm motion is governed by the steering flow, and the eye radius and vertical extent are set by other aspects of the dynamics. The relationship is only approximate because real storms are unsteady and the balance is never exact, but it is accurate enough to be useful.

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