Tropical Cyclogenesis Triggered by Rossby Wave Breaking over the Western North Pacific

This study presents a possible large-scale factor of tropical cyclogenesis over the western North Pacific, which is triggered by Rossby wave breaking to east Japan. More than half cases accompanied cyclogenesis. Results from composite analysis for indicate that genesis and development cyclones are dominant southwest quadrant center, where an intrusion upper-level potential vorticity caused consequent enhanced convection seen. The number in exponentially increases time during developing stage breaking. results further lower-level strong wind convergence associated convection, resulting breaking, favorable conditions An monsoon trough Pacific–Japan pattern can regulate tracks cyclones. These show trigger through southwestward convection.