贵南地区2次暴雨天气过程对比分析

Comparative Analysis on Two Rainstorms in Guinan Area

利用MICAPS常规实况资料,从降水实况、天气形势、物理量特征等方面,对2015年6月29日和8月2日2次贵南地区暴雨天气进行诊断分析和对比分析。结果表明,2次暴雨过程都发生在有利的大尺度环流背景下,都受副热带高压影响当中。暴雨出现的区域在卫星云图上与中尺度对流云团的发展密切相关,具有明显的暴雨和局地短时强对流云团特征。在散度场上高层辐散、低层辐合的配置,不仅有利于暴雨天气的产生,同时也促进了暴雨区附近中尺度对流系统的发展和维持,为大降水提供有利的动力机制。产生强降水天气前期能量较高,从低层到高层水汽比较旺盛,为2次暴雨天气提供高温高湿的条件,另外,地形辐合抬升也为这2次暴雨天气提供了重要的动力条件。

The Guinan region rainstorms on June 29 th,2015 and August 2th were diagnostic analyzed and comparative analyzed from the following aspects,including live precipitation,weather conditions,physical characteristics,etc.,by using MICAPS routine factual information. The results showed that two heavy rainfalls occurred in a favorable large-scale circulation,which were subject to the influence of the subtropical high. The rainstorm area on satellite images closely related to the development of the mesoscale convective clouds and it had obvious short-term local rains and strong convective cloud features. Upper-level divergence and convergence of low-level configuration in divergence field were not only conducive to rainstorm generation,but also to promote rainfall areas near the mesoscale convective systems development and maintenance,and they provided favorable dynamic mechanism of heavy rain. Higher early energy which producd heavy rainfall weather and relatively strong vapor from low to high provided hot and humid conditions for 2times rainstorm. Further convergence uplift terrain also provided an important impetus for these two conditions rainstorm.