雷雨性豪雨の発生と気象状況

1994年・関東平野での解析事例

抄録

Almost every year small rivers and drainage basins in urban areas suffer from flooding as a result of large-scale typhoons or concentrated thunderstorms. To minimize damage from such urban flooding, it is very important to predict rainfall and to take appropriate flood-fighting measures quickly. In this study, the relationship between the occurrence of a thunderstorm and the weather condition of the site is investigated. The place where a thunderstorm occ-urs may be related to updraft affected by wind convergence and topography, and to the spatial distribution of temperature. Furthermore, the occurrence of a thunderstorm is influenced by not only the lower-layer short-term weather condition but also the upper-layer condition and the long-term condition.