This story has been made freely available as a public service to our readers. Please consider supporting SCMP’s journalism by subscribing. Hongkongers should brace for cooler and rainy weather on Tuesday as temperatures are expected to drop progressively to as low as 16 degrees Celsius (61 Fahrenheit) as a cold front approaches, according to the city’s weather forecaster. The Observatory issued an amber rainstorm signal at 7.50pm on Monday, warning of possible flooding in low-lying areas and...