Wind shear is a change in wind speed and/or direction over a short distance. It can occur either horizontally or vertically and is most often associated with strong temperature inversions or density gradients. Wind shear can occur at high or low altitude.
Four common sources of low-level wind shear are—
- Frontal activity
- Temperature inversions
- Surface obstructions
Wind shear is currently not implemented in Infinite Flight but it has a very big role of course in the real world.
Airplane pilots generally regard significant wind shear to be a horizontal change in airspeed of 30 knots for light aircraft, and near 45 knots for airliners at flight altitude.
References: ”Wind Shear” by the FAA. [PDF]