The Hong Kong Observatory issued the amber rainstorm warning signal at 10 am on Monday, cautioning residents to brace for heavy rain and potential flooding in some areas in the city.

The Observatory noted that heavy rainfall, exceeding 30 millimeters in an hour, has occurred or is expected generally over Hong Kong, with the downpour likely to persist.

Officials cautioned that low-lying and poorly drained areas may experience flooding, and urged those at risk to take precautions. The public was also advised to stay clear of watercourses to avoid flash floods.

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The Labour Department said in a statement that employers and contractors should avoid assigning employees to carry out electrical work in places affected by the rainstorm.

It added that, if electrical work is carried out in places not affected by the storm, suitable safety measures must still be adopted to prevent electric shock as the air would be more humid.