A powerful typhoon, named Dolphin, has made landfall on Japan's Okinawa island, leaving at least 44,000 buildings without power and injuring five people. The storm forced the closure of Naha International Airport and resulted in the toppling of numerous trees, overturned cars, and non-life-threatening injuries to elderly residents. As it moves westward, Dolphin is expected to make landfall on China's eastern coast late Sunday or early Monday, causing authorities there to shut down ports, schools, and airports like Ningbo Lishe International Airport. The typhoon season in the western Pacific usually occurs between May and October, with three typhoons typically reaching Japan each year. This year, a strong El Niño is predicted to make typhoons more intense. Dolphin, being one of these typhoons, forms in the north-west Pacific, while storms that form in the Atlantic or eastern Pacific are called hurricanes.