夏季乌鲁木齐地区一次暴雨天气分析

利用常规资料、地面自动站资料、FY-2E卫星TBB资料、新疆雷达拼图和NCEP FNL再分析资料,对2011年8月26～27日乌鲁木齐地区一次暴雨天气进行了大气动力学和卫星雷达图像特征分析。结果表明,此次大降水过程中中亚低涡槽是主要影响系统,槽前西南气流为此次暴雨天气提供充足的水汽条件;垂直运动是暴雨过程发生的必不可少条件,暴雨天气过程中,强大的上升气流将水汽输送高空,致使水汽凝结致雨,为暴雨提供持久的动力条件;分析卫星TBB资料可看出,TBB产品对对流天气有一定的指示作用,暴雨过程中短时强降水伴随着中尺度对流系统的活动。TBB低值的分布与对流发生位置的确定有一定的对应关系。

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.