Record rain around Nagoya forced about 400 people to evacuate. Roads were submerged in places and flood damage was reported in several districts.

Weather authorities described a pattern of heavy rain concentrated in a short period. When rainfall exceeds drainage capacity, flooding builds quickly even in urban areas.

With the Asian Games approaching, attention turned to flood preparedness at competition venues and supporting facilities, and in particular to the safety of plans to use container units for accommodation.

The organising committee said it would review drainage and evacuation plans facility by facility. Given the region's recurring summer and early-autumn downpours, operational planning has to assume such conditions.

Japan has seen more records for hourly rainfall broken in recent years, and calls to revisit the design standards for urban drainage have continued.

Evacuated residents stayed in temporary shelters set up at nearby schools and public buildings. Authorities continue to monitor river levels and areas at risk of landslides.