造成山东不同天气的两个西南低涡异同分析

１９９６年６月２８－２９日和７月３－４日两桨相似的西南低涡东移，造成山东降水的范围和强度却悬殊柝大，分析发现，西南低涡影响山东产生天气差异的根本原因在于引导气流，物理机制和热力结构的不同，尤其是引导气流的差异，西南低涡的移向基本上沿引导气流方向，而其发展决定于高空冷却平流的强弱，给出了西南低涡造成了山东暴雨的天气概念模型，对今后预报此类暴雨提供了一些参考。

Comparative Analysis of Two Southwest Low vortices Causing Different Weather in Shandong

here are two similar southwest low vortices moving eastward on June 28-29,1996 and July 3-4,1996,but causing large difference in coverage and intensity of precipitation in Shandong. Study on it shows: the basic reasons that southwest low vortices cause different weather in Shandong are the differences of steering flow,physical mechanism and thermal structure,esp. the difference of steering flow. The movement direction of the southwest low vortices is decided by the steering flow,but the development is decided by the intensity of aerological thermal advection. The weather pattern of rain gust in Shandong caused by southwest low vortices is given. The results give us some references in the operational forecast.