Record-breaking rainfall in areas east of Tokyo caused widespread flooding overnight, killing at least five people, leaving one person missing and disrupting travel across the region. Roads and homes were inundated, railway infrastructure was damaged and power outages were reported as torrential rain swept through parts of Chiba prefecture. The Japan Meteorological Agency downgraded its highest-level heavy rain warning for more than a dozen municipalities in Chiba on Friday morning as the rainfall eased. However, the agency warned that additional heavy rain was expected later in the day, raising concerns about further flooding and disruptions in already affected areas.

Daylight revealed the extent of the damage, with photographs and television footage showing muddy water covering roads, vehicles and residential areas. Dozens of homes were flooded, while sections of railway tracks were also affected. Emergency services continued assessing the damage as authorities worked to assist residents and travellers stranded by the severe weather. Thousands of commuters and travellers were left unable to continue their journeys after transport services were disrupted. The Ground Self-Defense Force deployed buses to help about 4,000 people who had spent the night stranded at Soga train station. The evacuation operation was completed later on Friday, allowing those affected to move to safer locations.

Narita Airport, one of the main international gateways serving the Tokyo region, also saw thousands of passengers stranded overnight. Train services connecting the airport were partially restored on Friday morning, although delays continued. Flights operating to and from Narita were reported to be running normally, allowing many travellers to continue their journeys as Japan's Bon Buddhist holiday week came to an end. The severe weather also disrupted local transport and raised concerns about further flooding as additional rain was forecast. Authorities continued monitoring rivers, roads and residential areas while assessing the consequences of the record rainfall. The scale of the flooding also created challenges for emergency crews attempting to reach affected communities.

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Despite the widespread disruption around the Tokyo region, Tokyo Disney, which is served by the affected local rail route, did not report any damage. The situation at Narita Airport also gradually improved as train connections resumed, easing the pressure created by thousands of passengers who had been unable to leave the area overnight. The fatalities and missing-person report have added a serious human toll to the weather emergency. Rescue and recovery operations were continuing as authorities assessed affected communities and infrastructure. Officials remained alert to the possibility of further heavy rainfall, particularly in areas already saturated by the overnight downpour.

The flooding comes during a busy travel period associated with Japan's Bon holiday week, when large numbers of people travel across the country. The disruption therefore affected both local residents and returning travellers, with transport authorities working to restore services while emergency agencies responded to the flooding. With more rain forecast, authorities are urging continued caution in affected parts of Chiba. The immediate priorities remain locating the missing person, assisting stranded residents and travellers, restoring transport links and assessing damage from one of the most severe rainfall events to hit the region in recent years.

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