
At least six people died in eastern Japan after heavy rain pounded Chiba prefecture late Thursday, triggering landslide warnings, power outages and widespread flooding. The Japan Meteorological Agency issued its highest Level 5 warning for heavy rain and landslides in Chiba for the first time, with 115mm of rain falling hourly in some areas—nearly the entire average for August.
Evacuation orders covered more than 400,000 people in Chiba and surrounding areas, while about 45,000 homes lost power. The bodies of a man in his 60s or 70s and a 66-year-old woman were recovered from floodwaters in Ichikawa and Sakura cities, respectively. Two others died after being trapped in submerged vehicles, and two additional fatalities were reported by Friday noon, according to NHK and the Chiba Prefecture Disaster Management Office.
Nearly 7,000 travelers were stranded overnight at Tokyo Narita Airport, with many sleeping on terminal floors as train services were suspended. About 1,700 people sought shelter at the Chiba prefectural government building, while hundreds more remained at Chiba station. Footage from NHK showed water surging from a maintenance hole, exceeding the height of a five-story building in Chiba’s central ward.
Chiba Governor Toshihito Kumagai called the situation “extremely unusual,” stating he had never encountered a disaster of this scale in his career. Kazuhito Shimamoto of the Ministry of Land, Infrastructure, Transport and Tourism urged residents near high-risk rivers to take immediate action to protect their lives and heed local evacuation advisories.
By Friday morning, the highest-level warning was downgraded to Level 4, though authorities warned of continued flooding and landslide risks. Approximately 26,000 households remained without power, and 45 homes were flooded in cities including Ichikawa, Kashiwa and Sakura, with another 39 reporting water seepage below floor level. A JMA official had described the rainfall as “shaping up to be an unprecedented level” during a Thursday news conference.
Soldiers were dispatched to assist with relief efforts as rain eased, but officials maintained evacuation orders affecting around 25,500 people. The downpours disrupted roads and rail services, with more than a dozen cars abandoned on flooded streets in rural Chiba.
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