Yeah typhoon season. Hard to say when travel delays will occur as typhoons are unpredictable - like girls mood swings when having their periods. If there are typhoons, it does messes up travelling to and from HK, if its very serious. We usually get one or two typhoons every year...
I recall a typhoon on a weekend in August last year which was raised to typhoon warning 10 (meaning stay at home and lock the windows and doors and expect heavy winds and rains) during the middle of the night. Was in Macau at that particular time and couldn't get on the last boat back to Hong Kong, so had to spend the night in a sauna to past the time