摘要
[Objective]The aim was to analyze the first fit of rainstorm in southeast Hubei on June 9,2011.[Method]GFS reanalysis data with resolution 0.5°×0.5°,routine-observational data,the intensive observations of automatic weather station data,satellite image as well as satellite image were used in the analysis for the process of a heavy rain on June 9-10,2011 during Meiyu in Hubei province.[Result]The heavy rainfall occurred under the favorable environmental conditions,but the single-obstruction situation during Meiyu was different from the typical double-obstruction one.The affecting systems were the trough at 45° N on 500 hPa caused the systems moving slowly in the middle and low troposphere.The strong convergence of water vapor and conditional convective instability were provided from the shear line on 700 and 850 hPa,the southwest jet flow and dry lines in the middle and low troposphere for heavy rainfall.Three rain clusters which brought heavy rainfall had the features of meso-scale β system,which came from warm and humid airflow,the tail of shear line on 700 hPa and the head of shear line on 850 hPa.Through convergence and strengthening in southeast region of Hubei Province,the ribbon structure from northeast to southwest was formed to maintain the meso-scale β system.The cloud was the direct producer of precipitation.Heavy rainfall occurred in strengthening phase of strong convection zone on Tongcheng city.[Conclusion]The study provided theoretical reference for the report of rainstorm during Meiyu period.
