A intensity wind shear at Lukou airport in Nanjing at 09:00 on 21 June 2006 is observed. A 50 km diametric convective cell moved eastward passing Lukou airport. It could been observed in reflectivity PPI image from Doppler radar at Longwang hill in Nanjing. This convective system leaded to the wind shear process at Lukou airport. Mesoscale observation network confirmed that there was rapidly changingflow in Nanjing at that time. These two data were analyzed. The analysis showed that there was horizontal wind shear at low level below 3 km and vertical wind shear at 1 km height. Development process of the convective cell can be clearly understand with the help of Vertical Integral Liquid product evolved from Doppler radar. This is helpful to forecast the location of wind shear.Downward flow from macroburst spreading on surface induced horizontal and vertical severe wind shear.
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