【作者】 张弘； 梁生俊； 侯建忠；

【Author】 ZHANG Hong, Liang Shengjun, Hou Jianzhong (Shaanxi Meteorological Observatory, Xian, Shaanxi 710015)

【机构】 陕西省气象台；

【摘要】 通过西安市两次突发暴雨分析认为:暴雨成因是台风北侧低空东风急流与中纬度西风带低值系统共同作用的结果;台风低压北侧的气旋性环流在低空形成的偏东风急流带是此类暴雨的主要水汽通道和能量通道;冷锋前暖区内中β尺度对流系统(MβCS)的活跃直接导致了突发暴雨的生成和维持;台风北侧低层偏东急流、云图上MβCS的动态对暴雨生成和维持具有较好的指示意义。更多还原

【Abstract】 After the analysis of two abrupt rainstorm in Xi’an, the following conclusion can be drawn: the cause of rainstorm is effect of east wind jet along the north side of typhoon and the low-system west wind belt on middle latitude. The pivotal vapor and energy pathway is the jet of east wind belt along the north side of typhoon low- pressure circulation. The meso-β-scale convective system(MβCS) bring on development and maintain of abrupt rainstorm.The change of east wind jet along the north side of typhoon and MβCS on ultra-red cloud chart have obvious indication.更多还原