摘要
利用常规观测资料、NCEP/NCAR资料、FY-2E卫星云图、雷达等资料对2010年7月17～21日潍坊地区出现的局地大暴雨天气过程进行了分析。分析表明:此次局地大暴雨的主要影响系统为高空槽、切变线、低空急流和气旋。大暴雨落区k指数均大于36℃,大暴雨落区跟k指数大值区相吻合。冷空气从潍坊西北部侵入,触发不稳定能量释放,产生对流性强降水,强降水产生在暖空气一侧。强上升运动区与强降水落区非常吻合。此次强降水的地面中小尺度分析显示,地面低压移过的路径或地面辐合线对应着强降雨中心。这对于短时临近预报中确定降水落区、起止时间等具有很好的指示意义。
Based on the routine observational data,NCEP/NCAR data,FY-2E and radar data,an analysis is performed of a typical local heavy rainstorm process on 17 to 21 July 2010 in Weifang City.The result shows that the main influencing systems of the local heavy rainstorm are Prior Trough,shear line,Low level Jet and cyclone.K index of the rainstorm area is bigger than 36℃ and they are tallied each other.Intruding from the northwestward of Weifang,cold air triggers the release of unstable energy and produces convective rainstorm.The rainstorm occures in the warm air side.The area of powerful updraft is often accompanied with the heavy rainfall distribution.The mesoscale and microscale analysis of the heavy rainfall shows that the moving path of the surface low or surface convergence line is accompanied with the centre of the heavy rainfall.This has a good indicative effect for the precipitation area and the beginning and ending time in the short term forecasting and nowcasting.
出处
《中国人口·资源与环境》
CSSCI
北大核心
2013年第S1期184-187,共4页
China Population,Resources and Environment
基金
山东省气象局预报员专项资助(编号:sdyby2012-07)
关键词
大暴雨
地面辐合线
K指数
中小尺度分析
heavy rainstorm
surface convergence line
k index
mesoscale and microscale analysis
