This story has been made freely available as a public service to our readers. Please consider supporting SCMP’s journalism by subscribing. The Hong Kong Observatory cancelled the amber rainstorm warning for a second time on Saturday, after the city was hit by heavy showers and thunderstorms under the combined influence of a southwest monsoon trough and a low-pressure trough. The earlier downpours prompted the forecaster to issue an amber rainstorm warning – the lowest in the three-tier system –...