Affected by a rain band associated with KOPPU, torrential rain fell near dusk on September 15th, and the Observatory issued the Amber Rainstorm Warning for a second time of the day at 17:55 HKT.

• 受到巨爵外围雨带影响，15日傍晚本港落下倾盆大雨，天文台因此在下午5时55分发出当天第二个黄色暴雨警告信号。