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:
- Horizontal wind shear - A change in the wind over a horizontal distance. Measured in knots/1 000 ft.
- Vertical wind shear - A change in speed and/or direction with change of height. Measured in knots/100 ft.
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