wind shear

(redirected from Windshear)
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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 ?
The only modification on the vehicle was applied to the driveshaft which had to be disconnected to protect the differential this is standard practice at Windshear.
More than 500 fatalities and 200 injuries have resulted from windshear crashes involving 26 aircraft between 1964 and 1985.
The card-ending bet365 Handicap over a mile and a quarter has an impressive recent history to live up to - the last two winners have been Jack Hobbs and Windshear.
at a height of 340 meters, after getting a windshear (abrupt change in wind speed and direction) alert, the crew decided to go around and then continued on holding pattern waiting for improved weather conditions," the report said, according to (http://sputniknews.
The resultant windshear can cause aircraft to drop suddenly.
The Luca Cumani-trained Connecticut and Hannon's Windshear are other noteworthy international hopefuls.
Brian Meehan's horse cruised into the lead two out under Jimmy Fortune and pulled clear in the closing stages to rout Windshear (8-1) by five lengths.
I expect to see him go one better this afternoon although Elite Army has only tasted defeat once in four starts and that was on soft ground at Sandown behind Windshear (reopposes) last spring.
WINDSHEAR can breeze up in the Group 3 Ormonde Stakes at Chester under top man Ryan Moore.
15: CANNOCK CHASE (R L Moore 11-4Jtf) 1; Windshear (11-4Jtf) 2; Extra Noble (8-1) 3 8 ran.
One windshear downdraft at the wrong time and not only will you not clear the cliff, you might never see it coming.
Predictive Windshear Detection with windshear event data recording and retrieval.