Abstract
Part I of the present study has shown that a long lived meso-α-scale convective system (MαCS) during 14-15 July 1979, which was accompanied by a weak Baiu frontal depression consisted of meso-β-scale convective systems (MβCSs) and the development/decay and movement of MβCSs had strong influence on the behavior of the MαCS.
In Part II, the fine structure of precipitation was studied using dense surface observation data over western Japan (Kyushu). MβCSs consisted of a few meso-γ-scale convective systems (MγCSs), which had the life-time of∼3 hours and brought precipitation of 1-5×108 tonne. Although MγCSs developed in the eastern, central and trailing portions of the depression, the large part of the precipitation over Kyushu was brought about by MγCSs generated around the trailing portion. These MγCSs were generated over the western coast of Kyushu.
Under the condition of strong vertical wind shear in the trailing portion, MγCSs showed remarkable band structures generated over the western coast of Kyushu. The intense precipitation (maximum 100mm/hour) in this area was not associated with strong gusts nor with temperature fall.
The orographic influence of Kyushu on the generation of MγCSs and the possible role of symmetric instability in the strong vertical shear flow on the formation of precipitation bands were discussed.
