RELATIONSHIP BETWEEN THUNDERSTORMS AND THEIR METEOROLOGICAL FACTORS IN THE KANTO PLAIN

In small urban rivers, floods occur almost every year not only because of typhoons but also concentrated heavy rain such as thunderstorms. To implement the flood control plan adequately and flood prevention activity quickly, it is necessary to understand characteristics of the concentrated heavy rain. In order to forecast the occurrence and movement of thunderstorms and deal with them, it is important to make clear the relationship between thunderstorms and their meteorological factors.In this study, the relationship between thunderstorm occurrence and wind convergence is studied for the Kanto plain, which is the largest plain in Japan where the geometrical effect may mot be included.