This story has been made freely available as a public service to our readers. Please consider supporting SCMP’s journalism by subscribing. New users who download our updated app get a seven-day free trial. The Hong Kong Observatory has warned that the city will be hit by torrential rain and squally thunderstorms on Thursday and Friday as tropical cyclone Danas gradually enters Guangdong. The forecaster also said on Wednesday that it might issue a Strong Monsoon Signal, depending on local changes...