Typhoon No. 19 Flatland also suffered heavy rains due to high sea water temperature October 19th 4:08
Typhoon No. 19 caused heavy rain not only along the mountain but also on the flat ground, causing serious damage such as river flooding. Experts point out that the main factor was that the amount of steam blown near the center was considerably higher because the seawater temperature in the east, such as Kanto, was higher than normal.
In this typhoon, not only “along the mountain” where the river is upstream, but also the “flat land” downstream, the amount of rain increased.
Regarding this factor, Professor Takashi Nakamura of the Research Center for Advanced Science and Technology at the University of Tokyo analyzed the factors of record heavy rain based on typhoons, water temperature in the sea near Japan, and rainfall data.
On the “mountainside”, strong and strong winds from the east and southeast brought about by large and extremely powerful typhoons hit the mountains of Kanto Koshin and Tohoku, and develop rain clouds for a long time. Is the main factor.
The main reason for the increased rainfall in the “flat land” was that the seawater temperature on the Pacific side of Kanto and Tohoku was 2 to 3 degrees higher than normal, and the typhoon speed was relatively slow. I give it.
In the vicinity of the center of the typhoon, a large amount of water vapor is blown by warm seawater and rain clouds develop, and it is said that this rain cloud slowly passed through the flat land such as Kanto, and it continued to rain very heavy rain.
Professor Nakamura said, “The pace of water temperature rise in the sea near Japan is particularly fast in the world, and typhoons will continue to be strong and easy to approach. The amount of rain will increase. Therefore, the idea that it's okay again isn't valid. You have to keep in mind that there is a high risk of serious damage, "he said.