遵义机场一次暴雨天气过程成因分析

Cause Analysis of a Severe Precipitation Process at Zunyi Airport

利用常规气象观测资料、NCEP再分析、多普勒雷达资料,对2015年7月22日遵义机场发生的暴雨天气过程进行分析研究。结果表明：500 hPa高空槽、700 hPa切变线、850 hPa西南涡为此次过程提供了动力抬升条件;700-500 hPa间的水汽输送为暴雨的发生提供了水汽来源;上层辐散、下层辐合的空间结构有利于强降水的发生维持;假相当位温高能舌、K指数大值的出现与雷达回波在雷暴强降雨天气的发生结束判断上有一定参考作用。

A torrential rain case occurred at Zunyi Airport on July 22,2015. By using conventional observation data,NCEP / NCAR 1° × 1°reanalysis data,the rainstorm process was analyzed. The results show that the 500 hPa trough,700 hPa shear line,850 hPa southwest vortex provides dynamic lifting condition for the rainstorm process;the vapor transport between 700 - 500 hPa provides vapor; the spatial structure of high- level divergence and low- level convergence is conductive to the precipitation maintenance; the appearance of the high energy tongue of potential pseudo- equivalent temperature and the great value of K index,and radar echo has a certain reference role in the judgment of strong thunderstorm rains＇ occurrence and end.