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What is the definition for horizontal windshear?
  • A
    The change of the vertical wind vector with horizontal distance, as might be determined by two or more anemometers mounted at the same height along a runway.
  • B
    The change of the horizontal wind vector with horizontal distance, as might be determined by two or more anemometers mounted at the same height along a runway.
  • C
    The change of vertical wind vector with height, as might be determined by two or more anemometers at different heights on a mast.
  • D
    The change of horizontal wind vector with height, as might be determined by two or more anemometers at different heights on a mast.

WIND SHEAR is a sudden change in wind direction and/or speed over a very short distance. We can think of wind shear as a gradient in wind velocity that can be interpreted in the same way as a pressure or temperature gradient. Wind shear can be broken up into two parts:

  • Vertical wind shear is defined as change of horizontal wind direction and/or speed with height, as would be determined by means of two or more anemometers mounted at different heights on a single mast.
  • Horizontal wind shear is defined as change of horizontal wind direction and/or speed with horizontal distance, as would be determined by two or more anemometers mounted at the same height along a runway.
Wind shear may be associated with a thunderstorm, a low-level temperature inversion, a jet stream or a frontal zone. 

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