wind shear

(redirected from Wind sheer)
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wind shear,

a sudden, drastic change in wind direction or speed over a comparatively short distance. Most winds travel horizontally, as does most wind shear, but under certain conditions, including thunderstorms and strong frontal systems, wind shear will travel in a vertical direction. Microburst wind shear is an extremely violent downward blast of air that hits the earth and radiates outward. With its sharp shifts in wind direction and relative wind speed, it can cause an aircraft to lose lift and crash, especially during takeoff or landing, when the slower speeds and closeness to the ground make altitude correction more difficult. Since 1996 all U.S. airliners have been required to be equipped with instruments that provide the pilot with advance warning of wind shear. See also weatherweather,
state of the atmosphere at a given time and place with regard to temperature, air pressure (see barometer), wind, humidity, cloudiness, and precipitation. The term weather
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 and windwind,
flow of air relative to the earth's surface. A wind is named according to the point of the compass from which it blows, e.g., a wind blowing from the north is a north wind.
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.

wind shear

[′win ‚shir]
(meteorology)
The local variation of the wind vector or any of its components in a given direction.

wind shear

wind shear
Vertical wind shear near the ground.
The rate of change in the wind velocity in space, considered as a vector. A vertical shear is a change in the wind velocity with height, whereas a horizontal shear is the change in the wind with the horizontal distance perpendicular to the flow.
References in periodicals archive ?
Last year, El Nino, a major warming of the equatorial waters in the Pacific Ocean, created elevated wind sheer.
Moisture, fungal decay, termites, and wind sheer tests exceeding 205 pounds per square foot (PSF) were no match for walls featuring the Dryloc/LP SmartSide combination.
The winds to the east of Florida had low wind sheer as the storm developed, and the system took advantage of this, growing extensively.
It appears from the investigation that severe weather built up quickly on the North Shore of Kauai, generating severe wind sheer, thunder and micro bursts.
TOW-LINE goes into battle with SKYFIRE the jet and a heroic SKID-Z races to beat the evil WIND SHEER.
Steele indicated, "This crash appears to be due to wind sheer similar to the Delta Dallas crash and the final finding may point to pilot judgment in proceeding under those weather conditions or poor recovery technique.
However, your boss and co-workers won't make the stay/go decision about you should the organization hit wind sheers.