Naha airport, the main gateway to Okinawa, closed on Friday and cancelled all its domestic and international flights. open image in gallery Typhoon Dolphin over Japan's southern islands on Friday, with its forecast track running west towards China. Forecasters have warned separately of heatstroke risk in southern Japan, with temperatures expected to reach 36C. Toyota suspended production at nine factories in Japan on Friday over fears the storm would disrupt the shipping of finished vehicles. The storm could linger over southern China for two or three days, or turn north and bring prolonged wind and rain to the north of the country.