【摘要】 对武汉地区１９９８年７月２１～２２日连续两天出现的特大暴雨过程进行雨情和天气环流特征分析，认为这次特大暴雨的发生是一次７００ｈＰａ能量锋区锋生的结果；造成能量锋锋生的主要原因是非绝热θｓｅ平流、锋区上中－β尺度低涡生成和对流不稳定大气中环绕锋区有正垂直环流；通过对锋生函数的定量计算，其结果与定性分析相吻合更多还原

【Abstract】 During 21～22 July 1998, sustained extremely heavy rain occurred in Wuhan . It has been demonstrated that frontolytical energy front in 700 hPa caused the extremely heavy rain. Main reasons that caused frontogenesis are non adiabatic advection θ se ,meso β scale low pressure system and vertical direct circulation around frontal zone in convective inslability atmosphere. Quantitative characteristics in frontogenesis is the same as qualitative analysis.更多还原