Abstract：In order to do a good job in the prediction and early warning of extremely heavy rainstorm,conventional meteorological data,weather maps,NCEP reanalysis data and satellite cloud images are used to analyze the extremely heavy rainstorm process in Fuzhou City,Jiangxi Province,from May 5th to 6th,2023.The results indicate that:Jet Divergence Zone at 200 hPa in Fuzhou City,the Ural Mountains block the high pressure at 500 hPa,and the splitting trough in the cut-off vortex of the Balkhash Lake moves eastward,providing favorable circulation conditions for the extremely heavy rainstorm process;850 shear line,surface cold front,stationary front and mesoscale convergence center are the direct impact systems of this extremely heavy rainstorm;The southwest vortex at the middle and low levels is stable with little movement,and the southwest jet at 850 and 925 hPa in the east is stable and maintained at low and ultra-low levels,which is the key factor for this extremely heavy rainstorm.The specific humidity at 850 hPa in the eastern Jiangxi region reaches 15 g/kg,with a false equivalent potential temperature reached 346 K,and the central value of the maximum area of the average convective effective potential energy (CAPE) reached 1250 J/kg,which provided favorable water vapor and unstable energy conditions for the extremely heavy rainstorm.The extremely heavy rainstorm process is caused by multiple convective cloud clusters and mesoscale convective complexes.The topography of the windward slope at the west foot of Mount Wuyi Mountain plays an important role in the increase of rainstorm.The research provides an analytical basis for the prediction and early warning of extremely heavy rainstorm in Fuzhou,Jiangxi Province.
2024, Vol. 41 
