Typhoon Fengshen may bring swells to the city's beaches, posing a danger to those seeking a cool, watery refuge from the current heatwave, the observatory warns. Standby signal No1 was issued at 7.40am yesterday, when the tropical cyclone's centre was about 800km from Hong Kong. The very-hot-weather warning, issued on Saturday, was in force until just before 5pm yesterday. Temperatures reached as high as 35 degrees Celsius in some parts of Hong Kong. 'As there is a typhoon approaching, there may be swells along the south China coastal areas. So water-sports lovers are advised to stay away from the shoreline and stop all water activities,' the observatory warns. At 6pm, Typhoon Fengshen was about 580km south-southeast of Hong Kong and was forecast to move north or north-northwest at about 16km/h, approaching southeastern China. Since the heat warning was issued, the Senior Citizen Home Safety Association has received 3,513 calls for help from elderly people, and 206 were admitted to hospitals for treatment. The hot weather is expected to last for a week. The forecast shows temperatures will range between 27 and 32 degrees over the next seven days, and it will be fine but hazy with one or two showers. Meanwhile, a pet dog died after being washed away by waves when its owner took it to the Star Ferry Pier in Tsim Sha Tsui for a stroll at 1pm. The dog's body was found floating about 400 metres from shore by firemen.