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 issued the amber rainstorm warning on Sunday afternoon, saying that violent gusts might affect the city.The signal was issued at 2.20pm, indicating heavy rain exceeding 30mm per hour had fallen or was expected to persist across the city.The forecaster said that under the influence of the northeast monsoon and localised upper-air...