A developing low-pressure system and a seasonal rain front are expected to bring heavy rain to wide areas of Japan from Kyushu to Hokkaido through Friday.
The Meteorological Agency forecasts up to 200 millimeters of rainfall in the Kyushu and Shikoku regions, and 100 millimeters for the Chugoku, Kinki and Tokai regions in the 24 hours through Friday morning.
Southerly winds are also expected to gradually intensify as the low-pressure system develops.
On Friday, winds of up to 72 kilometers per hour are forecast for Hokkaido and up to 64.8 kilometers per hour on the Pacific side of the Tohoku region. Maximum instantaneous wind speeds of 108 kilometers per hour are forecast for both regions.
Weather officials are urging residents to be on the alert for landslides, flooding in low-lying areas, overflowing rivers, as well as strong winds and high waves.