College of Oceanic and Atmospheric Sciences;
Ocean University of China;
Qingdao 266100;
P. R. China;
Department of Physics;
Imperial College London;
London SW7 2AZ;
UK;
Qingdao Meteorological Bureau;
Qingdao 266003;
P. R. China;
explosive; extratropical; cyclone; meteorological; bomb; rapid; cyclogenesis; mesoscale; structure; northwestern; Pacific;