The Hong Kong Observatory issued a rainstorm warning signal and a thunderstorm warning as torrential downpours lashed the city on Friday. In the past 24 hours, many places registered precipitations over 50 mm, with some places recording rainfall of over 70 mm. Due to bad weather conditions, classes of all half-day and whole-day schools in Hong Kong were suspended. Meteorological authorities warned residents to be careful during travel as persistent heavy rainfall could cause water-logging and traffic jams.