A developing low-pressure system is expected to bring extremely stormy weather to all parts of Japan over the weekend.
Officials at the Meteorological Agency warn of possible landslides, strong winds, and flooding in low-lying areas.
They say warm, humid air moving toward a low-pressure system has caused rain clouds to form above a large area of the nation's Pacific side.
The low-pressure pattern is expected to move through western parts of the country to the Japan Sea on Saturday, making atmospheric conditions unstable over wide areas, including eastern Japan.
Strong winds and localized downpours are expected in eastern and western Japan on Saturday. The rain and wind will intensify in the north through Sunday.