2010年7月甘肃一次区域性暴雨分析

摘要

利用甘肃省自动站降水、NCEP/NCAR 1°×1°再分析资料、FY-2C卫星云图等资料,对2010年7月22～24日甘肃东部发生的区域性暴雨天气过程进行分析。通过对高空天气形势、多种物理量场以及卫星云图等数据从不同角度对此次暴雨过程进行分析。研究表明：此次暴雨天气过程是由于大陆高压的快速发展西进,切断高原东部的短波槽造成切断低压引起的;降水强度大、持续时间长是造成累计大降水的主要原因;另外台风＂灿都＂的存在也在一定程度上加强了暴雨量级。%Based on precipitation observations from automatic meteorological stations in Gansu Province,NCEP/NCAR 1°×1° reanalysis data and infrared satellite cloud pictures observed by FY-2C,a regional rainstorm event occurred on 27 and 28 July 2010 in eastern Gansu Province was analyzed.Results show that the rapid develpment and moving westward of the continental high cut off the short wave trough in eastern plateau and formed the cut-off low,which resulted in this regional rainstorm weather event.Strong precipitation intensity and a long lasting time caused the large accumulated rainfall.The ＂Chanthu＂ typhoon maybe strengthened the rainstorm magnitude.