The result shows that extra low-altitude jet flow is the main cause of instability energy and water vapour except for the favorable large scale circulation.

Analysis of The Low-level Jet(LLJ) Effect on Typhoon Torrential Rain in Guangxi and The Conceptual Model;

The results show that the heavy rainfall,which had two main rain belts and significant daily variations,was mainly associated with the active 500 hPa trough,850 hPa shear line,low-level jet and cross-equatorial flows.

The relationships between the large scale circulation characteristics,low-level jet and warm heavy snow in Aletai distract were analyzed.

The results show that the high potential vorticity,dry air from the upper level of troposphere extended downwards and southwards,which increased the vertical component of the vorticity on the steep iso-entropy plane and promoted the rapid development of the low level cyclone,resulted in a low level jet and the intensive convergence in .

The results show that unbalance force of atmospheric motion and the coupling reaction among convective cloud cluster and moisture frontal zone and low level jet lead to the continuation of strong c.

Based on the improved definition of the low level jets(LLJs) in China,the southwesterly low level strong winds are divided into low level jets that have vertical axes in low level and low level strong winds(LLSWs) that have no wind axes, and the differences of the climatic and synoptic characteristics between them are discussed.

The cloud cluster self\|exciting process caused by the coupling reaction between strong vertical wind shear V/p and great vertical velocity gradient Δ ω is studied according to the non\|homogeneous distribution of wind field near the low jet and strong vertical velocity variation in the edge of cloud cluster.

The results indicated that the low vortex was a prominent baroclinic system,and there was keeping the strong southwest low jet in the southeast position of the moving low vortex .