河南商丘一次罕见强对流天气分析

Analysis of a Rare Strong Convective Weather in Shangqiu

利用Micaps常规资料、自动气象站资料、探空资料、卫星资料和新一代天气雷达资料等多种气象资料,采用天气学和天气动力诊断方法,分析了2010年7月17日河南商丘发生的历史罕见强对流天气成因,结果表明:受低槽及副热带高压边缘西南气流共同影响,地面弱冷空气侵入,结合辐合线南侧中低空西南暖湿气流,冷暖空气交汇,层结极不稳定,进而中低空急流的爆发和急流内大风中心的传播造成的强烈辐合上升运动,使中尺度涡旋云系中形成多个对流旺盛的对流单体,最终造成强降雨、雷电、局地强风暴等强对流天气.

Using Micaps routine data,automatic meteorological station data,sounding data,satellite data and new generation weather radar data and other meteorological data,the synoptic and weather dynamic diagnosis method, the author analyzes the causes of a rare strong convective weather on July 17,2010 in Shangqiu. Affected by low trough and subtropical high edge of southwest airflow,ground weak cold air intrusion,combined with low-level convergence line on the south side of the southwest warm and humid air,the intersection of cold and warm air, stratification was unstable. The outbreak of middle-low tropospheric jet and the spread of gale center caused strong convergence ascending motion,so that the multiple convection vigorous convection cells formed in the mesoscale vortex structures,and then resulting in the strong convective weather like heavy rain,thunder,strong local storm.