The authorities on Sunday warned residents in much of Japan to prepare for a strong, slow-moving typhoon set to hit during the peak summer travel week.

Typhoon Lan is on course to make landfall Tuesday on the island of Honshu near Osaka, the country’s second largest metropolitan area, bringing heavy rain and violent gusts, the Meteorological Agency said.

Some areas may see as much as 50 centimeters (20 inches) of rain in 24 hours to 6:00 am Tuesday, followed by more rain as the typhoon churns across the nation, the agency said.