This story has been made freely available as a public service to our readers. Please consider supporting SCMP’s journalism by subscribing. Hong Kong’s forecaster has reminded the public to stay warm as a cold front is due to hit the city on Tuesday, adding it expected about nine to 17 days when temperatures will dip below 12 degrees Celsius (54 Fahrenheit) this winter. The Observatory said on Monday the cold front was expected to move across the coast of Guangdong province in mainland China at...