2011 Seoul Floods, South Korea

Causes and meteorology
On July 26, rains and thunderstorms triggered by a trough hit the mountains of the Korean Peninsula, producing over 495 mm (19.5 in) of rain in the Seoul region during a two-day span, the heaviest such event in July since 1907. 587 mm (23.1 in) of rain was recorded in the area after three days.