北京暴雨有多大？4天下了近1年的雨

Core Viewpoint - The article discusses the extreme rainfall event in Beijing from July 24 to July 28, 2025, highlighting its intensity and impact on the region's infrastructure and environment [1][2][4]. Summary by Sections Rainfall Characteristics - The rainfall lasted for 147 hours, with an average precipitation of 210.4 mm across the city, and the maximum recorded rainfall reached 543.4 mm, which is nearly equivalent to a year's worth of rain in just four days [1][2][4]. - The rainfall was particularly concentrated in the northern mountainous areas, with the highest average precipitation recorded in the Miyun District at 366.6 mm [4][5]. Extreme Weather Events - The event was characterized by extreme weather conditions, including hourly rainfall exceeding 80 mm and three-hour rainfall surpassing 180 mm in certain areas, which are classified as extreme convective weather [5]. - The occurrence of such extreme weather patterns poses significant challenges for accurate forecasting and requires ongoing improvements in predictive capabilities [5]. Satellite Imagery and Monitoring - Satellite imagery has become a crucial tool for assessing geological hazards, with recent images showing extensive flooding around the Miyun Reservoir [6][8]. - Approximately 30 satellites were mobilized to gather data for monitoring changes and assessing the impact of the flooding [9]. Infrastructure Response - The local government initiated a comprehensive inspection of bridges and roads affected by the reservoir's discharge, implementing specific control measures for 64 bridges and conducting continuous monitoring [10]. - Traffic control measures were enacted on key routes, with adjustments made to public transport services in response to the flooding [10].