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

In order to get further understanding the influence of the Tibetan Plateau vortex's to storm rain in southwest Sichuan Basin China and to summarize the storm rain's prediction experiences of this region, by using the Tibetan Plateau vortex and shearline yearbook 2001-2011, China historical MICAPS weather graphs, daily rainfall data in southwest Sichuan Basin stations and the NCEP FNL global data, the characteristics of causing storm rain Tibetan Plateau vortex in southwest Sichuan Basin are analyzed. Results show: 1. The main influence month in one year of Tibetan Plateau vortex to storm rain in southwest Sichuan Basin in China is July. 2. The Tibetan Plateau vortex usually moves to east and leads 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 into 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 Plateau 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 China southwest Sichuan Basin caused by Tibetan Plateau vortex has clear high temperature, high moisture characters over Plateau sky, with clear vertical ascending air flow and leaning to north with the altitude ascending, which is good for the air future convection development.

Key word:Tibetan plateau vortex, torrential rain, weather systems