2010年6月3日强对流风暴过程分析

Analysis on Severe Convective Storm Process on June 3^(rd) in 2010

利用常规资料、卫星云图、多普勒雷达产品,对2010年6月3日发生在三门峡市的强对流风暴过程进行分析。结果表明,此次过程影响范围大、持续时间长,过程发生时东北低涡稳定少动,贝湖高压脊前强盛的偏北气流不断向低涡中输送冷空气,低涡后横槽转竖引导冷空气南下影响三门峡。过程发生前低空东风急流建立,为此次强对流过程提供了充足的水汽;上干下湿、上冷下暖的环境场有利于强对流天气的发生。在预报过程中,三门峡附近郑州探空站K指数的变化对当地强对流天气的预报具有较好的指示意义。另外分析多普勒雷达资料发现,当组合反射率因子达60 dBz,同时垂直累积液态水含量达35 kg/m2时,产生局地冰雹的可能性非常大。雷达径向速度场中,零等速线呈反"S"形,风向随高度逆时针旋转,雷达站附近有冷平流存在,为对流天气的持续提供了有力支持;同时在风暴前沿与强回波相对应的有辐合并伴有中气旋,中气旋的出现有利于将冷空气带入对流风暴,促使对流持续旺盛发展。

A severe convective storm process occurred on June 3rd in 2010 is analyzed based on the conventional data,satellite images and Doppler radar products.The results show that the influence range of the process is wide,the duration time is long.During the process,the northeast low vortex occurs to less stability.The strong northerly flow in the front of the ridge keep the transport of cold air in the low vortex,vertical cross-slot switch in the back of the vortex leads cold air to move to the south,thus affect Sanmenxia.Before the process come up,the foundation of low-altitude easterly jet provides sufficient moisture for this convection process.Under such wet on dry,warm under the cold environment on the field is in favor of the occurrence of severe convective weather.In the forecasting,the evolution of K index of Zhengzhou station near Sanmenxia,has good indication of local strong convective weather forecast.In addition,Doppler radar data analysis found that when combined reflectivity reached 60 dBz,meanwhile vertically integrated liquid water content reached 35 kg/m2,local produces very large hail possible.In radar radial velocity fields,the zero-constant line is anti-＂ S＂-shaped,counterclockwise rotation of wind direction with height,the cold advection near the radar station provide strong support for the convective weather.Meanwhile,there is convergence merger in a storm front and strong echoes accompanied mesoscale cyclone,the occurs of the mesoscale cyclone is benefit to follow the cold air to the convective storm,prompting continued strong development of convection.