Weather is expected to turn wet and windy over the weekend as tropical cyclone Damrey moves closer to the Guangdong coast. Damrey moved into Hong Kong's 800km alert boundary yesterday, prompting the Observatory to issue the stand-by signal at 10.41am. Last night Damrey was centred about 600km east-southeast and was moving at 10km per hour west or west-northwest towards Hainan . The Observatory forecast the storm would pass through the northern part of the South China Sea on Saturday. The public was urged to stay away from the shore because of swells at sea. Although the storm posed no immediate threat to the city yesterday, it resulted in very hot weather. The mercury rose to 36.4 degrees Celsius in Cheung Chau. A construction worker suffered heat stroke in Tsim Sha Tsui. The Home Affairs Department opened nine heat shelters last night.