Warm, humid air blowing from the east is causing heavy rains in Japan's southern Kyushu.
Evacuation orders have been issued to more than 12,400 people in all parts of Yakushima Town in Kagoshima Prefecture. Residents have been told to evacuate immediately.
The Meteorological Agency says the rain in Yakushima is falling at a level seen only once every 50 years. The agency is warning against landslides.
Rainfall of more than 50 millimeters per hour has been recorded, bringing the total in some areas during 12 hours to 8 p.m. on Saturday to more than 420 millimeters.
Radar analysis indicates about 120 millimeters of rain fell over a one-hour period up to 6:10 PM in the southern part of the town.
Heavy rain is expected to continue to fall in southern Kyushu until Sunday, bringing the total rainfall over a 24-hour period to 200 millimeters in the Tanegashima-Yakushima region.