North China Air Traffic Control initiates large-scale flight diversion contingency procedures.

According to the North China Air Traffic Control Bureau, due to the influence of the subtropical high pressure and upper-level trough, strong convective weather occurred at Beijing Capital and Daxing airports on the evening of the 19th, with thunderstorm strong winds. It is expected that light showers will continue at Capital Airport until 8 a.m. on the 20th, with accumulated rainfall reaching moderate to heavy levels. This thunderstorm weather process has a wide range, long duration, and high intensity. The North China Air Traffic Control Bureau has initiated a large-scale flight diversion guarantee procedure and implemented thunderstorm safety measures.