Wind shear

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This article explains the term wind shear; for other meanings see shear .

The formation of ice crystals in cirrus uncinus clouds indicates strong wind shear with changing wind directions and speeds.

Downdrafts with accompanying virga form clouds that appear like aurora borealis in civil twilight in the eastern sky over the Mojave desert .

When wind shear , wind gradient or rare Scherwindgradient is the difference in wind speed or wind direction designated over relatively short distances.

In the earth's atmosphere , a distinction is made between vertical and horizontal wind shear. Horizontal wind shear occurs predominantly in the vicinity of tall structures, solitary trees and other vertical obstacles such as rock ledges. Vertical wind shear usually manifests itself in increasing wind speed in proportion to the distance from the earth's surface. The aerodynamic flow resistance of the unevenness on the surface slows down the winds close to the surface.

Particularly pronounced shear effects arise in the vicinity of sharp-edged obstacles, as well as from strong and gusty winds, for example in thunderstorms or in the jet streams .

Wind shears close to the ground pose a risk to air traffic , especially if they hit an aircraft during take-off or landing.

See also

• Shear layer
• Downburst
• Gust of wind

Web links

• Wind shear in the dictionary of the German Weather Service

Individual evidence

1. ↑ Vertical wind shear . HurricaneScience.org (English) accessed October 2015