WATCH: Hail Breaks Glass Roof of Hong Kong Mall

Hong Kong and Southern China got hit by biblical rain and hail Sunday evening — smashing windows, damaging property and causing the authorities to issue a black rainstorm warning, the highest such alert this year.

The dire weather canceled and delayed hundreds of departures from Hong Kong’s Airport, caused flooding in the street, shops and subway stations, and even broke the roof at the glitzy Festival Walk shopping center in Kowloon.

Seven casualties were reported in Hong Kong due to the rainstorm, and one person remains in serious condition, South China Morning Post reports. In addition, at least 16 people were killed in southern China as the same storm system passed over.