三门峡市2005-08-17暴雨天气过程分析

利用"9210"实时资料,欧洲ECMWF和T213格点资料、物理量分析场,分析了2005-08-17三门峡市暴雨过程中500 hPa、700 hPa、地面天气形势及流场、水汽通量、总温度平流、散度,结果表明:副高东退,随着短波槽的东移加深,850 hPa和700 hPa槽前形成了≥6 m/s的偏南气流,打开了水汽通道,为暴雨形成提供了充足的水汽来源;中高层低槽后部冷空气的斜压作用以及地面西路冷锋的触发抬升,加之散度场上低层强烈辐合、中层上升、高层辐散的耦合机制,为暴雨形成提供了充足的动力条件。

Rainstorm Weather Process Analysis of Sanmenxia on August 17,2005

Based on "9210" real-time data,European ECMWF data,T213 grid point data and physical quantity field,the paper analyzes the weather situation which is at 500 hPa,700 hPa and on the ground of rainstorm weather process on August 17,2005 in Sanmenxia.And the flow field,moisture flux,total thermal advection and divergence are also analyzed The results indicate southern airflow above 6 m/s in front of 850 hPa and 700 hPa trough turns on the vapor channel followed by the subtropical high retreating eastward and the short-wave trough deeper moving eastward,which supplies abundant vapor source to forming rainstorm.The old air baroclinic motion of the rear upper-middle layer low trough,trigger uplift of ground western cold front,and the coupling mechanism of strong convergence in low layer,uplift in middle layer and divergence in upper layer in divergence field.These supplies abundant dynamic conditions to forming rainstorm..