the vector convergence field (VCF)at 700hPa of each QV is better than that of itself at 850hPa and 500hPa in reflecting precipitation,especially,the VCF at 700hPa of ageostrophic-and wet-QV have good indications to synchronous rainfall;

• 70 0hPa各 Q矢量的辐合场较各自在 850hPa及 50 0hPa的相应场对降水的反映更好 ,尤其是 70 0hPa非地转 Q矢量及湿Q矢量辐合场与同时刻地面降水的发生有很好的对应关系 ;