三小时内暴雨预警连升两级 北京此轮强降雨为何没完没了？

Core Viewpoint - Beijing has issued a red rainstorm warning, indicating severe weather conditions with expected rainfall exceeding 150mm in most areas and potentially reaching 300mm in some locations, posing high risks of natural disasters such as flash floods and landslides [1][2]. Group 1: Weather Conditions - The red rainstorm warning was upgraded from an orange warning within three hours, highlighting the intensity of the rainfall [1]. - Rainfall from July 24 to 25 reached an average of heavy rain levels, with significant short-term rainfall recorded in northern areas, including 95.3mm in one hour in Dongyu, Huairou, and a total of 315.3mm over six hours in Huangtuliang, Miyun [1]. - Continuous heavy rainfall was observed, with an average of 34.9mm recorded from 6 AM on July 27 to 6 AM on July 28, indicating persistent heavy rain conditions [1]. Group 2: Meteorological Analysis - The extreme rainfall in northern mountainous areas was attributed to the uplift effect of southwest warm moist air from the edge of a subtropical high, causing continuous rain band formation [2]. - The weather pattern is expected to change, with the influence of a high-altitude shortwave trough and the ongoing warm moist conditions, leading to significant rainfall and potential severe convective weather, including thunderstorms and hail [2]. - Rainfall is expected to continue into the night of July 28, with a shift to localized severe convective weather expected on the afternoon of July 29 [2]. Group 3: Public Advisory - Meteorological authorities advise the public to stay updated on weather forecasts and warnings due to the rapidly changing weather conditions and to take necessary precautions [3].