9615号台风特点及其原因分析

The Analysis of the Characteristics and Causes of Typhoon Sally

通过对现有资料的分析及与历史相似个例的比较，对９６１５号台风的特点及其原因进行了分析．结果表明，该台风具有路径稳定、移动快、近海发展迅速、登陆强度大、灾情重等特点；西太平洋副热带高压强大而稳定、对流层中层存在暖区是该台风路径稳定、移动迅速的主要原因；副高强大而稳定、对流层中层相对湿度大、低层水汽辐合、高层为辐散场等为该台风在近海发展提供了有利条件．

By analyzing the relative data and comparing with similar historic cases, the characteristics and causes of typhoon Sally are analysed here. The conclusions are: Sally is characterized by stable track, quick movement, quick offshore development and strong landing intensity, etc. The strong and stable west Pacific high pressure and the warm zones in the middle troposphere are the major causes of the stable track and quick movement of the typhoon. The strong and stable subtropical high pressure, the high relative humidity in the middle troposphere, the water vapor convergence in the lower level, and the divergence field in the upper level provide advantages to the offshore development of the cyclone.