Hong Kong has been hit by more heavy showers and thunderstorms as a trough of low pressure moved over the Pearl River Estuary. The downpours prompted the Hong Kong Observatory to issue an amber rainstorm warning – the lowest in a three-tier system – at 5am on Saturday, before cancelling it at 8.45am. More than 30mm of rainfall was recorded in many areas during the morning. Tsuen Wan was among the worst hit, recording 70mm of rain – a level comparable to the threshold for a top-tier black...