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Impact of Wind Shear upon Aviation and Its Predictable Scale

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    Abstract:
    The wind shear caused by the passing of a coldfront through the Capital Airport on 11 November 2008 and its predictable time scale are analyzed by means of the NCEP reanalysis data and AMDAR data.It is concluded that while the coldfront passing，there existed several forms of wind shear，including the horizontal wind shear related to an upperlevel trough; the vertical wind shear caused by the upperlevel and midlevel jet axes，temperature inversion before the coldfront，as well as the horizontalwind and crosswind shear on the runway surface while the surfacefront passing.The predictable time scales of these forms of wind shear are also discussed.

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