Analysis on Heavy Rainstorm in Hubei Province on 18 June 2011

Using the conventional observation and surface station data,NCEP 1°×1 ° reanalysis data,FY-2E satellite cloud image,Wuhan and Jingzhou Doppler radar data,the heavy rainstorm in Hubei Povince on 17-18 June 2011 was analyzed for the Dynamic diagnosis and mesoscale weather analyses.The obtained results are as follows:(1) The heavy rainstorm is produced in the large scale background and the special region.This heavy rainstorm is triggered by severe intersection of cold dry air from the north and warm moist air in the south of Jianghan plain and the eastern part of Hubei Province.(2) Mesoscale convective clouds have three types: A single cloud,combined cloud and the rapid development cloud.The greater the cloud scale,the longer the life history.The new cloud development around the α mesoscale convective cloud is the most rapidly,and rainfall is the largest.(3) Mesoscale echo group,which rotation is cyclonic,and mesoscale complex which is produced by a strong north wind and low-level south wind jet streams in cooperation with the scale of this rainstorm complex process,are the main forms of the radar echo.(4) Terrain for the intensity of rainstorm and the zones play the important roles.The middle reach of the Yangtze River region due to specific topographic effects formed three airflow.Mesoscale convergence system which is composed by the airflow plays an important role in the formation and development of mesoscale convective clouds.The strengthening and development of the F-cloud is closely related to the terrain.