The storm packed with strong winds of the speed of 64.8 kilometres per hour at its eye was detected early today, state-run Xinhua news agency reported.
Warning the tourists in Hainan islands, the officials said the typhoon was gathering strength in the South China Sea and could bring strong gales and downpours from Sunday.
All six inter-provincial trains departing from the beach resort of Sanya suspended services today and will not resume operations until next Tuesday, according to a statement from Sanya Railway Station.
Over 340,000 people were evacuated with train and flight services suspended as Typhoon Dujuan hit east China's Fujian province on Tuesday.