临夏州一次连阴雨天气过程诊断分析

Analysis on a Continuous Rain Process in Linxia Prefecture

利用常规气象资料,对2014年4月14—21日临夏州出现范围广、降水强度大的连阴雨天气从环流形势演变和水汽条件等方面进行分析。此次连阴雨天气形成的原因:2次东移的乌拉尔山低槽与南支槽相结合是此次过程的主要影响系统;副高位置较常年偏西偏强使冷暖空气交汇于川北及甘肃南部地区;西南暖湿气流的发展为连阴雨过程提供了充足的水汽条件。

By using conventional meteorological data,a continuous rain process in Linxia Prefecture during April 14th to April 21th ,which has the characteristics of wide range and large intensity ,was analyzed from the aspects of circulation situation and moisture conditions. The reasons caused the continuous rain process were as follows ：the main influencing system of this process was two Ural east-moving low trough and the south trough ,the location of subtropical high was stronger than normal,and toward west;it made cold and warm air converged in north Sichuan and south Gansu Province ;the development of southwest warm air provided abundant water vapor for this continuous rain process.