Variation in wind velocity occurring along a direction at right angles to the wind’s direction and tending to exert a turning force.
- Near the ground, thunderstorms sometimes create quick changes in wind speed and direction, called wind shear, which has caused several crashes.
- Slow the airplane to reduce impact forces; also, you'll likely encounter wind shear and strong downdrafts.
- Winds blowing in different directions, or at different speeds create what meteorologists call wind shear.
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