Abstract
The evolution process and fine structure of a long-lived MαCS(meso-α-scale convective system) in the subtropical East Asia was studied for 14-15 July 1979 using Geostationary Meteorological Satellite IR observation and radar observation data.
This MαCS was generated in the Baiu frontal zone under the influence of a weak short-wave trough and developed into a weak Baiu frontal depression. The MαCS consisted of a few MβCSs (meso-β-scale convective systems). The evolution and propagation of the MαCS were related to both development and displacement of MβCSs.
The successive generation of MβCSs over the western coast of Kyushu (western part of Japan) indicated the orographic influence on the formation of convection. The successive development of MβCSs to the west of the preexisting one over Kyushu resulted in the slow moving of the MαCS over Kyushu.
The environmental conditions for development of MβCS and the strong response in the upper-level wind field to MβCSs are also discussed.
