经济日报：华北为何出现极端降雨

Core Viewpoint - The article discusses the recent extreme rainfall in North China, highlighting the complex weather patterns and the potential risks associated with flooding and geological disasters in the region [1][2][3]. Weather Conditions - Since July 23, northern regions have experienced continuous heavy rainfall, with Inner Mongolia, northern Hebei, Beijing, and the Taihang Mountain area being the core zones of precipitation [1]. - As of July 26, 19 weather stations in northern China broke historical monthly extreme values, with 13 stations setting new records. Cumulative rainfall exceeded 100 mm in many areas, with some regions surpassing 400 mm, indicating the extremity of this weather event [1]. Causes of Rainfall - The heavy rainfall in North China is attributed to several factors, including abundant moisture from the summer monsoon, the influence of the subtropical high-pressure system, and the interaction of cold and warm air masses [2]. - The topography of the Taihang and Yanshan mountains plays a crucial role in enhancing local precipitation by facilitating the uplift and condensation of moisture, leading to extreme localized rainfall [2]. Future Weather Trends - The next three days are expected to see continued rain and high temperatures in North China, with two significant rainfall events anticipated [3]. - A new rainband is expected to move from west to east, affecting eastern Inner Mongolia and northeastern China, while high temperatures will persist, particularly in the plains south of North China [3]. Public Safety Recommendations - Experts advise the public to stay informed about weather conditions, especially when traveling to mountainous areas prone to geological disasters [4]. - It is crucial to monitor government warnings and take precautions against secondary disasters, even when immediate rainfall is not occurring [4].