Hong Kong’s weather forecaster is monitoring a tropical depression that has formed within 800km (497 miles) of the city, but says it is unlikely to issue a typhoon warning signal.The Hong Kong Observatory said on Thursday that an area of low pressure over the northeastern part of the South China Sea had intensified into a tropical depression, which is centred about 530km south-southwest of Kaohsiung and expected to move towards the vicinity of Taiwan.It is forecast to move northeast on...