Nagoya issued emergency warnings after hourly rainfall surpassed historical records, prompting Level 4 evacuation orders for about 1.31 million people and Level 5 flood warnings for rivers flowing through Aichi and Gifu prefectures.
The Japan Meteorological Agency recorded 104.5 mm of rain in one hour, the highest hourly total in Nagoya since records began in 1890.
A Level 5 special flood warning was issued for the Shonai River in Aichi and Gifu prefectures, with authorities saying flooding was imminent or may have already occurred.
Nagoya and surrounding areas in central Japan received exceptionally heavy rain that caused rivers to rise and triggered large-scale evacuation advisories. City authorities issued their highest emergency safety warning for some neighborhoods and ordered or advised roughly 1.31 million people to evacuate or move to safer locations.
Agency reported 104.5 millimetres of rain fell in one hour through 4:53 p.m. in Nagoya. That value is the highest hourly rainfall recorded in the city since official records began in 1890. Heavy downpours pushed several rivers to dangerous levels.
The Shonai River, which runs through Aichi and Gifu prefectures, was put under a Level 5 special flood warning. Level 5 indicates flooding is imminent or may already be occurring, and authorities warned that certain areas could already be flooded.
The volume and intensity of rainfall in a short period produced rapid rises in river levels and flash-flood conditions in urban and rural areas alike. Hourly rainfall rates above 100 mm are rare in Nagoya's historical record and can overwhelm drainage systems and river-containment infrastructure.
Practical next steps for residents and nearby communities
Keep an eye on updates about river levels (especially the Shonai River), additional evacuation orders in neighbouring municipalities, and re-establishment of transport services. Local authorities will announce relief measures and damage assessments as conditions stabilize.
A historic short-duration rainfall in Nagoya triggered the city's highest emergency warnings and large-scale evacuation advisories. Record hourly rainfall and a Level 5 flood warning for the Shonai River created immediate flood danger, transport disruptions, and sheltering of residents. Authorities have urged people to move out of flood-prone places and to follow official instructions.
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The warning was issued in various parts of the country, with residents urged to take precautions against the rain.
The Japan Meteorological Agency is urging people to be on high alert for landslides, rising river levels and floods in some low-lying areas.
Land ministry officials are calling on people to stay away from rivers, irrigation canals and flooded roads.
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