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《Meteorology and Disaster Reduction Research》 2014-01
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Causes and Analysis of the Unconventional Data Characteristics of the Rainstorm Happened in Jiangxi During 14-16 May 2013

Chen Juan;Yin Jie;Chen Yunhui;He Wen;Jiangxi Meteorological Observatory;Yichun Meteorological Observatory;  
With the help of conventional observation data and some unconventioanl observation data,such as NCEP/NCAR 1o×1o data,wind profile radar data and GPS/MET precipitable water,this paper analyzes the cause of regional rainstorm happened in Jiangxi during 14-16 May 2013. Some conclusions come to be as follows:(1)Favorable dynamic conditions and abundant moisture during this rainstorm process came from the interaction among the upper trough,low level shear line,southwest jet and vortex.(2)The configuration with warm-wet in the lower layer and dry-cold in the higher layer provided strong thermal instable energy.The intensive stability(θse500-850)was conducive to arouse the growth of mesosacle convective cloud. The strong vertical wind shear and southwest jet at mid and lower level triggered instable energy release.(3)Low level jet stream monitored by wind profile radar was corresponding with heavy rainfall occurred at downwind direction,which meant that the features of radar monitored wind field can be referred to analyzing the evolution of synoptic system. The strong signal noise ratio and strong descend motion presented by wind profile radar coincided with heavy rainfall.(4)Heavy precipitation area was coincided with intensive perceptible water vapor(PWV)belt. The maximum rainfall intensity appeared after 1-3 h of the PWV peak value. Before it rained,if the PWV amplified obviously and maintained as a high value for a longer time,with a suitable dynamic triggering,the rainfall will be heavier.
【Fund】: 江西省气象局面上研究项目“新探测资料在江西强对流预警中的应用”
【CateGory Index】: P458.121.1
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