Rescuers were being scrambled Thursday to reach areas of southern Japan hit by flash flooding in the aftermath of Typhoon Nanmadol, which swept through the area this week.
At least one person was killed and several were reported missing after torrential rains swelled rivers and triggered landslides in Fukuoka and Oita prefectures.
In Fukuoka prefecture, about 375,000 people at risk of flooding were ordered to leave their homes. Overflowing rivers damaged the town of Asakura, where muddy rapids covered what had been dry ground. In neighboring Oita prefecture, more than 21,000 people were told to evacuate, NHK reported.
Japan's Meteorological Agency said unprecedented amounts of rain would continue to fall in the two prefectures through Thursday.