[1] NOAA, Natl Severe Storm Lab, Norman, OK 73072 USA
[2] Univ Oklahoma, Ctr Anal & Predict Storms, Norman, OK 73072 USA
[3] Univ Oklahoma, Sch Meteorol, Norman, OK 73072 USA
[4] Nanjing Univ, Sch Atmospher Sci, Key Lab Mesoscale Severe Weather MOE, Nanjing 210093, Jiangsu, Peoples R China