Beijing, Nov 13 : China's national observatory has renewed a blue alert for strong winds in some parts of the country. From 8 p.m. Sunday to 8 p.m. Monday, strong winds are expected in parts of the Yellow Sea, the East China Sea, the Taiwan Strait, the Bashi Channel, the South China Sea, the Beibu Gulf and areas to the east of China's island of Taiwan, Xinhua news agency reported, citing the National Meteorological Center (NMC). From 8 p.m. Monday to 8 p.m. Tuesday, gales are expected to sweep parts of the East China Sea, the Taiwan Strait, the Bashi Channel, the South China Sea, the Beibu Gulf, and areas to the east of China's island of Taiwan, according to the NMC. The NMC has issued a reminder for all ships and personnel navigating and operating in sea areas affected by the strong winds, urging them to promptly return to ports for safety. Relevant departments have been called upon to prevent fires in forests, grasslands and urban areas, as well as to ensure transport security. China has a four-tier, colour-coded weather warning system for strong winds, with red representing the most severe warning, followed by orange, yellow and blue. /IANS