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Analysis of Continuous Rainstorm Process in Northern Jiangxi under the Influence of a Typical Meiyu Front

Based on the NCEP reanalysis data and observation data such as the satellite data and radar data the continuous rainstorm process in northern Jiangxi from June 23 th to June 25 th in 2017 is ana-lyzed. The conclusions are as follows. 1) This continuous rainstorm process is a typical Meiyu front rainstorm process. The main influence systems are the low trough in upper level and vortex shear line in low level. The southwest jets exit in 700 hPa, 850 hPa and 925 hPa levels. The high-pressure divergence area in 200 hPa level corresponds to the low level shear convergence area. The lifting condition is good which is conducive to the formation and maintenance of rainstorm. 2) The strong southwest jet continuously transports water vapor to northern Jiangxi which provides sufficient water vapor supply in the whole process that resulting in the continuous rainstorm. 3) The energy front area is located in the front line of the Yangtze River and northern Jiangxi is located in the high value area of pseudo equivalent potential temperature. The value of CAPE is up to 2000 J/kg. Good energy conditions provide sufficient energy for this process which is conducive to the occurrence of convective precipitation. 4) The convective cluster which causes this rainstorm is formed by the cluster generated in place and moving cluster from northwest Jiangxi. The occurrence of several short-term heavy precipitation which exists long time in place has brought a serious flood disaster to the northern Jiangxi.