The Hong Kong Observatory issues a yellow rainstorm warning signal.

On August 5th at 17:05, the Hong Kong Observatory upgraded the rainstorm warning signal to yellow. On August 4th at 23:45, the Hong Kong Observatory had issued a black rainstorm warning signal. The black rainstorm warning signal indicates that Hong Kong has recorded or is expected to receive heavy rain with hourly rainfall exceeding 70mm in widespread areas, and the heavy rain may persist. According to data released by the Hong Kong Observatory on August 5th, as of 14:00 that day, the accumulated rainfall in Hong Kong had reached 355.7mm, breaking the record for the highest daily rainfall in August since 1884.