2005年7月清江流域一次连续暴雨的中尺度分析

Mesoscale Analysis of a Continuous Heavy Rain Occurrence in the Reaches of the Qingjiang River in July,2005

利用气象卫星、多普勒雷达及常规气象资料,对2005年7月8～10日清江流域连续暴雨过程进行综合分析。结果表明:(1)高低空急流的优势配置、高空急流右侧强辐散场的存在,副热带高压稳定于我国东南沿海,为此次暴雨提供了有利的大尺度环境背景;(2)雨团滞留和经过区域正是暴雨发生区域;(3)低层垂直风切变可使回波加强而产生强降水;(4)雷达回波中“逆风区”对于暴雨识别及暴雨落区预报具有很好的指示性。

Based on the satellite data, Doppler radar data and the general station data, the continuous heavy rain occurrence in the reaches of the Qingjiang River during 8-10th July, 2005.The results show that：（1）the suitable allocation of the upper and lower level jets, the strong divergence at the right of the upper level jet and the stable subtropical high at the southeast coast of China provide the favorable large-scale background for the generation of the heavy rain; （2）the region where the rain clusters last and pass is just the heavy rain region; （3）the vertical sheer of the low level wind intensifies the precipitation, which is indicated by the enhanced radar echo; （4）the ＂anti-wind area＂ of the radar echo is a good predictive index for the heavy rain identification and location.