Landslides in Chiba and Kanagawa due to record heavy rains from Typhoon No. 25, highest rainfall in one day in history in Sakura City and other areas

In areas where landslides occurred in Chiba and Kanagawa prefectures, the amount of rainfall on the 21st, when large and strong Typhoon No. 25 passed off the coast of the Boso Peninsula, was at or near the highest in statistical history. According to the Japan Meteorological Agency, No. 25 moved northward with thick rain clouds, and the amount of rain had increased since the 20th before it approached the southern Kanto region, causing the ground to loosen and causing the landslide.

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On the 21st, the rainfall amounted to 278.0 mm in Sakura City, Chiba Prefecture, 291.0 mm in Kisarazu City, which is adjacent to Sodegaura City, where the fatality occurred, 241.5 mm in Kamogawa City, and 244.0 mm in Miura City, Kanagawa Prefecture. Sakura City and Kisarazu City recorded the heaviest rainfall in a single day in statistical history, Kamogawa City the third highest, and Miura City the second highest, all of which significantly exceeded the average rainfall for a single month in September.

On the 20th, 99.5 mm of rainfall was observed in Sakura City, 109.5 mm in Kisarazu City, 126.0 mm in Kamogawa City, and 121.5 mm in Miura City.

At a press conference on the 21st, Takuya Hosomi, head of the agency's forecast division, explained that the 25th vessel was on a course to pass offshore instead of landing on the Boso Peninsula due to the influence of high pressure centered over the sea northeast of Hokkaido. However, it moved northward at a slower speed than expected, and because it took a long time to travel through areas with high sea surface temperatures, it developed into a large and powerful force, he said.