Weather officials have issued an emergency warning for violent winds, high waves and storm surges for Kagoshima Prefecture in southwestern Japan. They say a very strong typhoon could trigger the kind of disasters that are seen only once in a few decades.
Torrential rain and violent winds are hitting wide areas across the Kyushu region.
The eye of Typhoon Nanmadol is south of Kyushu on Sunday afternoon. It is slowly moving north-north-west. It is expected to move close to Kyushu, and could make landfall through Monday.
Officials say maximum winds of up to 180 kilometers per hour will lash northern and southern Kyushu, as well as the Amami Islands, with peak gusts reaching 252 kilometers per hour through Sunday.
Southern Kyushu could get as much as 500 millimeters of rain in the 24-hour period through Monday noon.
The agency also warns that as the typhoon is large, rain and winds could intensify even in areas far from it. Heavy precipitation is expected in western and some of eastern Japan through Monday. The typhoon is forecast to head northeast and travel across Japan's main island of Honshu through Tuesday.