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#hongkong has a well-oiled machinery when it comes to weather events.

HK Observatory issues weather warnings: Amber rain, red rain, black rain, monsoon, typhoon T1, T3, T8, T10

Schools, employers, government and private services have well-documented standards for when they'll be open, be closed, offer limited service etc, depending on weather signal and timing.

The city thankfully made a decision relatively early on, before adding millions of people, to invest in separate systems for rain drainage and waste sewage. The drainage has margins for even the most extreme weather events.