Officials in China moved some 414,000 people out of the way in Shanghai before the strongest storm in decades flooded roads and cancelled flights.

Chinese authorities said typhoon Bebinca is expected to hit the east coast as early as Sunday night and may pose a major public safety risk as tens of millions of holidaymakers take trips across the country for the mid-autumn festival.

Shanghai, China’s financial hub, has closed its seaports and canceled more than 600 flights as it braces for what may be the strongest tropical storm to hit the city in 75 years. Typhoon Bebinca is expected to make landfall early Sept.