wind shear - localised change in wind speed and/or direction over a short distance, resulting in a tearing or shearing effect, usually at low altitude, ...
Wind Shear
As with TCAS, government and industry jointly developed warning devices for aircraft that alert pilots to wind-shear conditions so they can take appropriate action to avoid these dangerous downdrafts of air.
WIND SHEAR Large changes in either wind speed or direction at different altitudes which can cause sudden gain or loss of airspeed. Especially hazardous when aircraft airspeeds are low on take-off or landing.
Wind Shear
Any rapid, horizontal, or vertical change in wind direction or speed.
World Aeronautical Charts (WAC) ...
WIND SHEAR- A change in wind speed and/or wind direction in a short distance resulting in a tearing or shearing effect. It can exist in a horizontal or vertical direction and occasionally in both.
WING TIP VORTICES-
(See VORTICES.) ...
A Microburst is a form of wind shear that is usually associated with convective activity. It is a severe downdraft that it critical to every type of aircraft flying through it.
August 2 - Delta Air Lines Flight 191, a Lockheed Tristar, crashes on approach to Dallas-Fort Worth International Airport because of wind shear from a sudden microburst thunderstorm. Of the 163 passengers and crew aboard, 29 survive.
A huge amount of cold air flows out of a Cb causing a strong downdraught with a cross section of 2 - 5 NM in center and horizontal wind shear and updraught around the center and severe horizontal wind shear outside of the Cb.
If there is a warm front passing through the area, there is almost guaranteed to be some low-level wind shear somewhere.
 See also: Direct, Aircraft, Speed, Wind, Pilot
  
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