This story has been made freely available as a public service to our readers. Please consider supporting SCMP’s journalism by subscribing. Hong Kong is bracing for a sharp change in weather as a cold front and upper-air disturbances are set to bring heavy showers on Wednesday, followed by a sharp drop in temperature to as low as 20 degrees Celsius (68 Fahrenheit) on Thursday. The Observatory said on Tuesday that showers would be “heavier at times” the following day, while a cold front was...