Mount Ontake
Upon making landfall on Honshu, Irma became the first tropical system to strike the nation that season. Impacting an area already devastated by prior flooding, Irma deluged the archipelago with additional precipitation. Mount Ontake received of rain throughout the duration of the storm. Additionally, Mount Amagi recorded in a day, including in an hour, both storm highs in those respective categories. A total of 1,475 mudslides occurred in Japan, resulting in 625 damaged homes. Approximately 650,000 customers were left without power at the height of the storm while 160 trains were delayed or cancelled, which left 50,000 people stranded. In Chiba Prefecture, one person was listed missing due to a drowning, where seven persons were also hurt and over 200 houses were flooded. There, 400,000 individuals were also stranded due to lack of train service. In Tokyo, 119 trees were toppled and 25 roads were flooded. Twenty domestic airline flights were cancelled and 26 railway lines within Tokyo were suspended, leaving 240,000 people stranded. Throughout the city, at least 40 dwellings sustained flooding. In Izu Ōshima, 17 boats were swept away and 20 houses were damaged. Offshore, 26 individuals were rescued from a freighter "Gloria Fortuna". Throughout the country, 493 people sought refuge in shelters. In all, 19 people were killed and 49 others were injured. A total of 811 dwellings were destroyed and 10,000 homes were damaged, with 12,691 houses flooded. Nationwide, a total of of crops were damaged. Across Japan, damage amounted to $545 million, including at least $61 million in property damage.