【摘要】 利用陕西关中地区46个自动气象站数据、NCEP/NCAR 1°×1°再分析资料、西安新一代多普勒天气雷达资料等,对2016年7月18日关中一次突发性暴雨过程进行分析。结果表明:影响此次暴雨的主要因子有西太平洋副热带高压、西北路弱冷空气、切变线、偏南和偏东风急流等。雷达图上,最强回波中心(45～55 dBz)高度在6 km以下,为低质心结构,径向速度图上零速度线呈"S"型,表示低层暖平流,风向辐合辐散和逆风区等特征均有利于短时强降水的发生。逆风区、VIL的峰值与强降水中心区、强回波中心位置有很好的对应关系。当VIL中心值在25～30 kg/m~2时,可能会出现小时雨强超过20 mm的短时强降水。这些结果对预报关中地区突发性暴雨有很好的参考意义。更多还原

【Abstract】 Based on the conventional meteorological data of Guanzhong region,NCEP/NCAR 1° ×1°reanalysis data and the characteristics of Doppler radar,the abrupt heavy rain processes occurring in Guanzhong region on 18 July 2016 was analyzed. The results show that the main factor affecting the storm were the western Pacific subtropical high,northwestern weak cold air masses,shear line,southerly and easterly jet. The radar reflectivity factors of the short-time heavy rainfall present lowquality core structure that the strongest echo center(45～55 dBz) height below 6 km,the low-level"S"warm advection on the radial velocity,wind convergence or divergence and adverse wind regions.AWR and the peak of VIL were consistent with strong precipitation centers and strong echo center.The appearing time of the AWR was half an hour ahead of the time of the short-time heavy rainfall.When the VIL content was 25～30 kg/m~2,there may be a short-time strong rainfall which raininess get up to 20 mm per hour. The results have a very good indication of the short-time heavy rainfall which occur in Guanzhong region.更多还原