The Causing Storm Rain in Southwest Sichuan Basin Characteristic Analysis of Tibetan Plateau Vortex

In order to get further understanding the of Tibetan Plateau vortex’s influences to the storm rain in southwest Sichuan Basin and to summarize the storm rain prediction experiences of this region，by using the Tibetan Plateau vortex and shearline yearbook 2001～2011，historical MICAPS weather graphs，daily rainfall data in southwest Sichuan Basin and NCEP FNL global data，the characteristics of Tibetan Plateau vortex causing storm rain in southwest Sichuan Basin are analyzed．Results show:1) The main influence time of Tibetan Plateau vortex to storm rain in southwest Sichuan Basin in one year is July．2) The Tibetan Plateau vortex moves to east and lead to clear rain in southwest Sichuan Basin，then turns to be weak and disappear．3) The Tibetan Plateau vortex with clear rain influence in southwest Sichuan Basin is usually warm vortex after generation in Plateau and then turns to be baroclinic vortex within 48 hours，with strong cold air flow invasion advection in it．4) The Tibetan Plateau vortex with influence to southwest Sichuan Basin usually accompanies with Plateau shear lines and under clear blocking situation background．There are southwest low Jiulong vortexes nearby the vortex，when most Tibetan Plateau vortex moves eastly，accompanying with low level jet air flow or high south wind air flow and coordination with South Asian High in high level．5) The storm rain weather process in southwest Sichuan Basin caused by Tibetan Plateau vortex has clear high temperature and moisture characters over Plateau sky，and with clear vertical ascending air flow and leaning to north with the altitude ascending，and this is be good for the air convection development．