People along the Japanese Pacific coast are bracing for powerful winds and downpours. Severe Tropical Storm Dolphin is set to close in on eastern and northern Japan on Thursday or Friday.
The storm is currently in waters south of Tokyo and heading northeast.
Intense rain, rough waves and wind gusts are expected to batter coastal areas through Friday.
Officials are urging people across the region to stay on alert for mudslides, flooding, and tornadoes.
East Japan Railway Company plans to suspend operation of parts of its network from Thursday.
Airlines say their domestic flights may be affected, depending on the course the storm will take and the strength of the wind.
They are calling on passengers to check their websites for the latest information.