从7月23日开始，北京本次降水持续了147个小时，属于极端强对流天气，潮白河流域创下六项历史极 值。 （总台记者 朱世松 刘宝凤 沈立） 根据中国气象局的标准，极端强对流天气是指小时降水量80毫米或3小时降水量180毫米，直径超过5厘 米的冰雹等天气。本轮降水符合两个标准，且连续在密云区出现极端强对流天气，为历史罕见，破坏性 极大。 ...

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].

Core Viewpoint - The article discusses the recent extreme rainfall in Beijing, highlighting its duration, intensity, and the challenges in forecasting such extreme weather events [1][2][3] Summary by Relevant Sections Duration and Intensity of Rainfall - The rainfall event has lasted for 7 days since July 23, with a total duration of 147 hours, surpassing the previous extreme event in 2021 which lasted 83 hours [1] - The average rainfall across Beijing during this period was 210.4 millimeters, with specific districts experiencing significantly higher amounts, such as 366.6 millimeters in Miyun District [1] Distribution of Rainfall - Rainfall distribution was uneven, with mountainous areas experiencing the most intense precipitation. The maximum recorded rainfall in Miyun District reached 573.5 millimeters [1][2] - Notable maximum hourly rainfall was recorded at 95.3 millimeters in Huairou District, indicating an extreme weather event [1][2] Characteristics of Extreme Weather - The rainfall event is classified as extreme convective weather, with instances of hourly rainfall exceeding 80 millimeters and 3-hour rainfall exceeding 180 millimeters in multiple districts [2] - The occurrence of such extreme weather is rare and poses significant destructive potential, highlighting the need for improved forecasting and warning capabilities [2][3]