This story has been made freely available as a public service to our readers. Please consider supporting SCMP’s journalism by subscribing. New users who download our updated app get a seven-day free trial. The Hong Kong Observatory issued a red rainstorm warning on Monday night, following warnings about heavy rain and serious flooding in areas of Wan Chai. The red signal was issued at 9.45pm, after the amber warning was earlier raised at 7.05pm. A red warning means heavy rain has fallen or is...