北京本轮强降雨已持续147小时，密云极端降雨为历史罕见

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]