The Hong Kong Observatory issued the Amber Rainstorm Warning Signal at 3:25 am, meaning that heavy rain has fallen or is expected to fall generally over Hong Kong, exceeding 30 millimetres in an hour, and is likely to continue.

There will be flooding in some low-lying and poorly drained areas.

People who are likely to be affected should take necessary precautions to reduce their exposure to risk posed by the heavy rain and flooding.

Heavy rain may bring about flash floods.

The Observatory said people should stay away from watercourses.