【摘要】 利用常规气象观测资料、1°×1°NCEP/NCAR的再分析资料等,对2009年4月24～25日广东出现的一次区域暴雨过程进行诊断分析,结果表明:高层辐散、高空槽过境与低层低涡东移耦合,冷空气和西南暖湿气流在广东中西部地区交汇,形成明显的气旋性辐合,促进了强降水的发展;弱冷空气入侵触发了此次降水过程,而低空西南急流在广东中西部地区的强风速辐合为大暴雨动力和充足的水汽条件;湿位涡对此次降水过程落区有较好的指示作用。更多还原

【Abstract】 Based on the conventional observation data and the NCEP/NCAR reanalysis data(1×1 deg),the diagnostic analysis on a regional torrential rain event during April 24 to 25 in Guangdong is carried out.The results show that the high level divergence,the couple of the passing upper trough and the low level vortex,and the cyclonic convergence by cold air and the southwest warm and moist air stream,together strengthened the development of the heavy precipitation;weak cold air intrusion triggered the rainfall process,and the low level southwest jet stream provided the dynamical condition of velocity convergence and the abundant water vapors for the heavy torrential rain;moist potential vorticity(MPV) have good indication for the rainfall distribution.更多还原