Typhoon Shanshan is expected to become a “very powerful” storm later this week, the Meteorological Agency said Sunday, bringing rain and gusts of wind to western and eastern Japan that could disrupt public transportation.

As of 3:45 p.m. on Sunday, the storm was moving northwest at a speed of approximately 30 kilometers per hour, with a central pressure reading of 980 hectopascals and maximum sustained wind speeds of 126 kph and gusts reaching up to 180 kph.

The agency said the storm — the sixth typhoon to form in the area around Japan this month — could bring strong winds and potentially severe weather on Tuesday as it nears land, with sustained winds of up to 162 kph and maximum gusts of up to 216 kph forecast.