Severe Tropical Storm Dolphin could bring downpours to the eastern part of the country through Saturday. Weather officials are urging people to stay alert for possible mudslides and flooding and low-lying areas, as well as wind gusts and high waves.

The Meteorological Agency says the storm was 270 kilometers southeast of the port city of Choshi in Chiba Prefecture neighboring Tokyo as of 6 a.m. Thursday, Japan time. It was moving northeast at a speed of about 20 kilometers per hour.