Abstract
As a continuation of the previous study (Yamasaki 2006), another example of tropical cyclone (TC) formation processes described by a 20-km grid model is presented. This paper describes a TC that forms from two band-shaped mesoscale convective systems (MCSs) embedded in a large-scale convective system, which is produced by horizontal convergence due to northerly flow associated with the previous TC and southwesterly flow of air that crosses the equator. Among many MCSs, two MCSs are selectively enhanced. These two MCSs rotate cyclonically. The western MCS approaches the eastern one, and these become a single system. When the orientation of the major rainband becomes west-east, the system attains TC intensity, as in the previous study.
