[1
]Department of Atmospheric and Oceanic Sciences, School of Physics; Peking University;
Beijing China
[2
]Key Laboratory of Meteorological Disaster of Ministry of Education; Nanjing University
of Information Science and Technology; Nanjing China
[3
]Center for Analysis and Prediction of Storms, School of Meteorology; University of
Oklahoma; Norman Oklahoma USA
[4
]State Key Laboratory of Severe Weather; Chinese Academy of Meteorological Sciences;
Beijing China