Abstract:

A heavy rain and hail event occurred in Zhangxian county from 16：20 to 19：10 on July 22，2003.Starting from the circulation background of large scale，and using diagnostic analysis of physics quantities，we discussed the main causes of the heavy rain.The results show subtropical high towards northwest，cold wave from north towards south，lower-trough and shear of Qinghai-Xizang plateau are the main circulation background of this event.By analyzing the three-dimensional contruction physics field of the circulation，it shows physics field has leading value to forecast nearly heavy rain

Key words: heavy rain, physics quantities, diagnostic analysis

摘要：

利用MICAPS常规资料，从大尺度环流背景入手，用物理量诊断分析方法，对2003年7月22日下午16时20分至19时10分发生于漳县县城的有气象记录以来最强的一次大暴雨、冰雹强对流天气过程进行诊断和分析，探讨漳县大暴雨天气的成因，结果表明：副高西伸北抬，北方冷空气南下及高原低槽切变东移是这次天气过程的主要环流背景。分析这种环流形势的物理量场三维结构特征，发现物理量场对暴雨的临近预报有较好的指示意义。

关键词: 暴雨, 物理量, 诊断分析