2023 Volume 79 Issue 27 Article ID: 23-27024
This study compares the factors of heavy rainfall caused by Typhoon Hagibis (Typhoon No. 19) in 2019 to the Kanto Mountains with those of previous typhoons that had similar paths and those extracted from a huge ensemble of data (d4PDF). The mountain separates the upper reaches of the Tone River and Chikuma River. The results indicate that the heavy rainfall was caused by the southeastward inflow of large amounts of water vapor and by the collision of dry cold air from the north and moist warm air from the southeast over the Chikuma River basin, which collided with a wall of cold air moving southward and then turned around. Furthermore, this typhoon was found to be one of the largest typhoons in the future meteorological field. The methodology can be commonly applied to the analysis of heavy rainfall cases caused by typhoons in a certain basin.
