Objective identification research on cold vortex and mid-summer rainy periods in Northeast China*
Gong Zhi-Qianga)†, Feng Tai-Chenb), Fang Yi-Hec)
       
Differences in 500-hPa omega ((a)-(c)) (in units of Pascal/s) and relative humidity ((d)–(f)) field (in %) between P2 and P1, between P3 and P2, between P4 and P3.