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Which quantity does a forecaster read from the wind profile for aviation?

  • A.The surface pressure, which must be set on the altimeter subscale before the aircraft begins its descent
  • B.The freezing level
  • C.The height of the cloud base, which determines whether an approach may be made under visual flight rules
  • D.Shear layers indicating turbulence and the jet core position

Answer: D

Rapid changes of wind speed or direction with height indicate shear layers where turbulence is likely, and the level of maximum wind locates the jet core. Both feed directly into flight planning and turbulence forecasts. The freezing level and cloud base come from the thermodynamic curves rather than from the wind profile.

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