“94·7"北京大暴雨的湿位势倾向诊断

利用湿位势倾向方程，对１９９４年７月１２－１３日的７００ｈＰａ位势高度场进行了诊断分析。结果表明，湿位势倾向方程中的差动潜热能平流项，对产生北京地区本次大暴雨天气的台风低压系统发展和移动，起到不可忽视的作用；而相对涡度平流项，在该次过程中作用不大。

A Diagnosis of Wet Potential Tendency Equation of"94. 7"Torrential Rain in Beijing

The wet potential tendency equation is used to diagnose 700hpa potential height on July 12-13 in 1994.The results show that the differential latent heat advection term has an important effect on the develpment and movement of the typhoon low generated the torrential rain in Beijing.But the effect of relative vorticity advection is much less during the torrential rain.