Weather officials say heavy downpours are hitting parts of the Shikoku region in western Japan.
The Meteorological Agency said developed rain clouds are continuing to hang over parts of the region due to warm and moist air.
It said 120 millimeters of rain fell in Kaiyo Town, Tokushima Prefecture, in the hour to 11:10 a.m. on Wednesday.
It added that in the hour to 11:30 a.m., 71 millimeters of rain fell in Minami Town in Tokushima Prefecture, and 44 millimeters fell in Muroto City, Kochi Prefecture. Mudslide alerts have been issued for both areas.
A river in Tokushima Prefecture has reached flood warning levels.
Developed rain clouds have also been observed in parts of the Chugoku region in western Japan.
The agency is urging people to stay on alert for mudslides, flooding in low-lying areas and swollen rivers. It also warned of possible lightning strikes, tornadoes and gusty winds.