Analysis on the Radar Echo's Characteristics of a Severe Rainstorm in Central Guangxi

[Objective] The aim was to analyze radar echo characteristic of a heavy rainstorm in central Guangxi in June,2010.[Method] Using conventional observations and automatic stations,Doppler radar and other data,a severe rainstorm in central of Guangxi which occurred on 31 May to 1 June 2010 was analyzed.The characteristics of weather radar data were analyzed to reveal the characteristics of radar echo during the heavy precipitation process.[Result] The heavy rainstorm had gone through many singular wind storms towards MCS variation.The existence of ultra-singular and train effect was the main reason of the heavy rainstorm.The results showed that during the heavy rainfall experienced an evolution process from multi-cell storm to MCS,and found that super cell and the train effect was the major reason which caused this torrential rain.The echo centroid of multi-cell storm stretching along its moving reverse order was the key factor which maintained the heavy rain.Analysis also found that the average echo intensity had a good relationship with rainfall.Strong echoes were in quasi-stationary state for a long time and was favorable heavy rain.In the diameter velocity diagram,mesoscale convergence line,the adverse wind regions and the mid-cyclone were the important basis to determine producing and keeping heavy rainfall.Radar wind profile can reflect the configuration of layers of wind conditions,and it was an effective tool to determine whether the trough was in transit or not.[Conclusion] The study provided reference for the short-term and nowcasting report.