A Study of Storm Rainfall on May 10，2000

Zhang Jingmei; Xie Shao

doi:10.3969/j.issn.1007-6190.2001.02.014

Abstract：This paper presents some characteristics of synoptic situation,atmospheric phisical field and application of numerical weather predicion products for the case of storm rainfall that occurred on May 10 ,2000.Some significant results were obtained as follows:①East Asia trough developed repeatedly and deepened rapidly at 500hPa,It led the low-level southwest vortex developed and moved towards east,which formed the typical“north trough and south vortex”system and caused the mesoscale “T” convergence shear of wind between the west of Guangdong and south of Guangxi.There was favourable synoptic background environment for the heavy rain.②The low-pressure trough of fronts at surface moved southward,and surface pressure fell rapidly,So it caused strong convergence and rising monton.The mesoscale updraft and precipitation were further strengthened.As a result,the atmospheric instability energy was delivered and the rainstorm was outbroken.③ The maintenance and reinforcement of the upper air divergence at 200hPa and the low-level convergence at 850hPa guaranteed the perseverance of ascending and made the low-level vapor move upword.④The rainstorm took place near the centre of the positive vorticity and the south to the rising movement.