At least eight people have died and roughly 7,000 travelers were stranded overnight at Tokyo’s Narita International Airport after record-breaking rainfall pounded Japan’s Chiba Prefecture on August 13 and 14, 2026.
The Japan Meteorological Agency formally named the event the “August 2026 Chiba Heavy Rain” after its meteorological monitoring station in Chiba City recorded 351 millimeters of rain in a single day, the highest daily total since records began in 1966 and far above the previous record of 259.5 millimeters set in 1996. Peak intensity reached 115 millimeters in a single hour, shattering the old one-hour record of 71 millimeters.
Record Rainfall Overwhelms Infrastructure
The deluge triggered JMA’s maximum Level 5 emergency alerts for more than a third of the prefecture’s municipalities, the first use of the highest-tier warning since the system was revised in May 2026. Eight deaths were confirmed across five cities, including three in Chiba City, two in Sakura, and one each in Ichikawa, Kashiwa, and Yachiyo. Several victims were found in flooded roads or vehicles caught in rapidly rising water.
Flooding severed rail lines, bus routes, and highways connecting Narita Airport to central Tokyo, stranding approximately 6,000 passengers inside the terminal as of late evening on August 13. Authorities distributed water, food, and sleeping bags, while another 3,877 people were accommodated in 17 temporary-stay facilities across the prefecture overnight.
Damage and Recovery Underway
The Fire and Disaster Management Agency’s situation report listed 85 homes affected, including one classified as half-destroyed and 84 others with above-floor or below-floor inundation. Widespread power outages compounded the disruption, and authorities maintained landslide warnings at critical levels even as the heaviest rainfall passed.
The prefecture’s governor said the total rainfall in parts of Chiba was roughly three times the average for the entire month of August.
The flooding struck during Japan’s Bon holiday week, one of the busiest travel periods of the year, compounding the chaos for tourists and domestic travelers. Rail services began resuming on the morning of August 14, and airport operators expected flights to return to near-normal operations by the end of the day.
The event highlighted growing concerns about extreme weather events in Japan’s densely populated eastern seaboard, where aging infrastructure is increasingly strained by more frequent and intense rainfall episodes driven by warming ocean temperatures.
Sources: Japan Meteorological Agency; Fire and Disaster Management Agency; AP News; Asahi Shimbun; The Watchers
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