呼和浩特市秋季一次大到暴雨天气过程分析

利用天气预报业务中的多种预报产品资料，对2008年9月21日呼和浩特地区秋季一次降水过程进行了分析，结果表明：（1）太平洋副高西伸，地面西南倒槽是本次降水形成的主要影响系统。（2）700hPa西南低空急流的形成与地面倒槽东移北上共同为降水提供了暖湿能量，对降水的形成发展起了重要作用。（3）在降水过程中，大气的高层辐散、低层辐合以及较强的垂直上升运动使降水加强。

A Weather Analysis on Heavy-hard Rain in Autumn in Hohhot

Using the various forecast production of weather forecast operation, the autumn precipitation process on September 21, 2008 in Hohhot ？district was thorough analyzed, the results showed： 1, western extension of subtropical high in Pacific and ground southwest inverse trough were the main effect system of forming this precipitation. 2. The forming of 700hpa southwest low-level jet stream and the moving to northeast of ground inverse trough provided warm and wet energy to this precipitation, and it played an important role in formation and development of this precipitation. 3. The upper-level divergence and lower-level convergence and vertical ascending motion of atmosphere strengthened precipitation in this precipitation process.