Microburst

The wind shear is a strong wind, which occurs in a small geographical area, while in the vicinity prevail only weak or otherwise directed winds. Penetrates into this area a plane a, then its motion - inertia - slow to adapt to the sudden change in wind direction and strength; that is, depending on the wind direction acts on the wings first, an additional buoyancy and buoyancy loss by increasing or decreasing airflow to the profile. Horizontal wind shear can occur at the gaps of hills and large rows of buildings, as well as be the result of a microburst ( down wind, and vertical wind shear ), the on the ground in a horizontal direction ( outflow ) is deflected.

Driving force are large differences in air pressure at which the wind acts as a motion compensation. Near the bottom is this weather phenomenon especially during the landing of aircraft a potential hazard represents a example of the aviation accident of Lufthansa Flight 2904 is in September 1993. Airbus A320 -211 is at the airport Warsaw during landing in bad weather windshear detected and subsequently overshot the end of the runway. In August 1985, Delta Air Lines Flight 191 was hit by wind shear. The Lockheed L -1011 TriStar was thereby forced to the ground, where they raced along a highway, killing a motorist before it exploded in front of the airport of Dallas. 134 people died, only 29 survived. This flight has an intense research for the early detection of wind shear triggered, which can be recognized now by in-vehicle Doppler radar.