CHARACTERISTICS OF CONVECTIVE CLOUD IN LINE-SHAPED RAIN BANDS FOR KANTO-TOHOKU HEAVY RAIN IN 2015

Abstract

 We analyzed the spatial distribution of convective clouds using Doppler radar for the Kanto and Tohoku torrential rains that caused a major flooding event in the Kinugawa River basin in September 2015. Specifically, based on observation data from multiple X-MP radars, a three-dimensional wind speed field was estimated by the variational method called MUSCAT method.

 Using the observed results, the convective clouds that are generated were moved momentarily. Then, the characteristics of the three-dimensional wind speeds inside and around them are arranged. Furthermore, when analyzing the temporal characteristics of the spatial interval of the convective cloud within the time zone in which the linear rainfall exists, lively convective clouds existed at intervals of about 10 km and about 50 km.