甘肃陇东黄土高原春末初夏局地暴雨诊断分析

Diagnostic Analysis of a Local Heavy Rain Occurred in Loess Plateau of Eastern Gansu

用常规观测资料、实时探空资料和雷达资料对2010年5月25～26日发生在甘肃陇东黄土高原春末初夏的局地暴雨天气过程进行了诊断。结果表明:此次局地暴雨过程由高空低槽、中低层低涡切变及西南急流、地面倒槽和冷空气共同影响产生;雷达回波上表现为局地暴雨由混合性降水回波产生,持续时间长,降水效率高;同时,暴雨量场及V-3θ图在暴雨的起报、结束及落区上有很好的预报能力。

Based on routine observed data,precipitation from the automatic meteorological station,physical quantity field,radar echoes and V-3θ digram,the local heavy rain occurred in loess plateau of eastern Gansu on 25-26 May 2010 was diagnosed.The results show that the upper-level trough,the middle-low-level vortex shears,southwest jets,ground inverted trough and cold air resulted in this local heavy rain.The mixed precipitation echo formed the local heavy rainfall and the rainfall lasted long.The prediction method based on the the forecasting tools（heavy rain field and V-3θ figures） could forecast the beginning,end and area of the heavy rain.