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Which practical use does the isallobaric wind have?

  • A.It indicates where low level convergence is developing
  • B.It gives the speed at which a pressure system will move across the chart over the next twelve hours
  • C.It measures friction
  • D.It determines the depth of the boundary layer through which the surface stress is being transmitted

Answer: A

Because the isallobaric wind blows towards falling pressure, a region of rapid fall attracts inflow and therefore convergence and ascent, which is a useful early indication of development. Pressure tendency also relates to system movement, but through a different argument. Friction and boundary layer depth are separate matters entirely, measured by other means.

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