Tropical Storm Sepat is expected to move along the southern coast of Japan's main island through Friday morning, as heavy rain pelts the country's central area.
The Japan Meteorological Agency reports that as of 9 p.m. on Thursday, Sepat was southwest of Wakayama Prefecture, central Japan.
The agency says the storm is heading northeast at 50 kilometers per hour, packing winds of about 65 kilometers an hour.
The storm and a front of warm, damp air located to its north have formed rainclouds over central Japan.
Thirty-three millimeters of rainfall were recorded between 8 p.m. and 9 p.m. in Aichi and Nagano prefectures.
Atmospheric conditions over much of Japan will remain unstable through Friday.
Heavy rainfall is expected to fall in parts of western Japan, moving to the east and northeast through Friday morning.
Maximum winds of about 65 kilometers per hour are expected in western, central, and eastern Japan through Friday. Wind gusts of 90 to 108 kilometers per hour are anticipated.
The weather agency is warning of mudslides, flooding in low-lying areas, and swollen rivers, as well as strong winds, high waves, and lightning.