The typhoon was just north of the main island of Okinawa with maximum winds of 144 kph (89 mph) as of Friday afternoon, according to the Japan Meteorological Agency. The Naha Airport on Okinawa Island said it closed Friday and all domestic and international flights in and out of Naha have been cancelled. As of midday Friday, 240 people had taken shelter at evacuation centres across Okinawa, the prefecture said. With Dolphin expected to affect part of Japan's southern main island of Kyushu, residents whose houses were damaged by last week's deadly earthquake were placing blue tarps on roofs and walls to prevent water damage. The agency predicted strong winds, heavy rain and high waves in the Okinawa region through Sunday, urging residents in the area to stay indoors.