Analysis on a Rainstorm in Summer in Urumqi

Using the conventional observation data,automatic weather station data,FY-2E satellite TBB data,Xinjiang radar mosaic and NCEP FNL reanalysis data,the atmospheric dynamics and satellite radar image characteristic of the heavy rain which happened in Aug.26 27,2011 in Urumqi area was analyzed.The results showed that: central Asia low vortex tank is the main influence system for the precipitation process,front of trough southwest airflow provides sufficient water vapor condition for the rainstorm;the vertical motion is the essential condition of torrential rain.During the rainstorm process,strong updraft caused condensation of water vapor for rain,providing long-lasting dynamic conditions for the rainstorm;Seeing from the analysis of satellite TBB data: TBB products has certain instruction function on the current weather,short-time strong precipitation along with mesoscale convective system activity during the heavy rain process.TBB low value distribution and convection location exists a certain corresponding relationship.