Downburst wind shear detecting algorithm using radar Doppler velocity

摘要

1.Introduction A downburst is significantly created by an area of rain-cooled air that,after reaching ground level,spreads out in all directions and is capable of producing damaging straight-line winds over 240 km h-1.Downbursts begin as small powerful downdrafts,typically inside thunderstorms that descend from 3000 to 6000 m above ground level.When these cold downward rushes of air reach the ground,they create a locally intense divergent wind shear that is very shallow.