In this study, an attempt is made to understand the relationship between CBs and their environmental conditions and clarify the development mechanism of CBs. The data used for this study includes radar and satellite images, weather charts, rainfall data, thermodynamic charts, and NCEP Climate Forecast System Reanalysis data. Twenty-four CB cases occurred during 2001-2010 were selected.
Most of CBs generally developed under some typical synoptic situations: 1) meso-low propagating toward the northwestern flank of the western Pacific subtropical high (WPSH), 2) stationary monsoon front, and 3) large-scale convergence between synoptic-scale low and WPSH. Environmental conditions of CBs were characterized by strong low-level vertical shear along the parallel direction of CBs, low-level convergence and predominant band-parallel mean flow in the lower-troposphere. Thermodynamic condition of southern area of CBs was much more unstable compared to that of northern area of CBs. Averaged mCAPE over southern area and northern area of CBs were 1273 m2 s-2 and 329 m2 s-2, respectively.
The Weather Research and Forecasting (WRF) model was used for simulating representative CB cases. Especially, development mechanism of convection bands consisting of narrow convective cells with no stratiform clouds will be given.