Abstract
With the increase of extreme climate events due to the global climate change, urban areas have been becoming more prone to flooding. The advancement of numerical prediction method for heavy rainfall is a key technology for early warning. The objectives of this study are twofold. One is to estimate the accuracy of WRF (Weather and Research Forecasting) model through its application to the heavy rains in Hiroshima City in August 2014. The other is to discuss the evolution of rainfall system that caused the heavy rains based on the numerical results. It is shown that high-resolution downscaled simulation with WRF can reasonably reproduce the spatio-temporal distributions of the heavy rains. The evolution of the rainfall system and hence the high precipitation intensity zone are found to be sensitive to high moisture transport through the Bungo channel to Hiroshima city.
