Why is the route from Shanghai Wusong Wharf to Putuo Mountain gone?

Due to the weather, the international air route between Putuo Island was temporarily suspended. There is always a route from Shanghai Wusong Wharf to Putuo Mountain. The route mainly depends on the weather. In case of irresistible weather such as strong wind and fog, earthquake and tsunami, or when the Maritime Safety Administration deems it necessary, stop sailing and resume sailing at any time when the weather is good.