Travellers have been warned of a possible airport closure as a powerful super typhoon approaches. Flights between Australia and Hong Kong are likely to be affected from 8pm Tuesday to 8am Thursday due to Super Typhoon Ragasa, Qantas said in a statement on Monday. The airline said it is monitoring the potential impact, with Hong Kong Airport Authority considering shutting down the terminal for 36 hours. The storm is then forecast to hit Hong Kong as it blows toward the coast of southern China. The weather is expected to deteriorate rapidly from Tuesday and gale-force to storm-force winds will impact the densely populated city on Wednesday, with winds expected to reach hurricane force offshore and on high ground.