Analysis on the Tornado in Outer Periphery of Typhoon Prapiroon

At 19:20 of August 3,typhoon Prapiroon landed on the coast area between Dianbai and Yangxi.On August 4,a series of strong tornadoes caused by the cloud belt of periphery irately attacked places such as Gaoyao Jindu,Sanshui Baini,Qingyuan Shijiao,Nanhai Dali,and have created serious disaster for the above areas.The tornado synoptic situation background was analyzed by the weather map material.Its environment field,cloud belt and echo was analyzed by physical measures such as ivergence,vorticity,vertical velocity,vertical wind shear,kindex and the satellite cloud chart,doppler radar material.