Core Viewpoint - The recent heavy rainfall in Guangdong is attributed to a combination of meteorological factors, including a low vortex system and the southwest monsoon, leading to significant flooding and related disasters in the region [1][4][5]. Group 1: Causes of Heavy Rainfall - The heavy rainfall is primarily caused by a low vortex system, which acts similarly to a typhoon but is generated over land, creating strong upward airflows that draw in moisture [4]. - The southwest monsoon is providing ample warm and moist air, which fuels the rainfall [4]. - The interaction between the low vortex and the southwest monsoon has been ongoing since early August, leading to continuous heavy rainfall in Guangdong [4]. Group 2: Impact and Consequences - The rainfall has resulted in urban flooding, fallen trees, and even landslides, with cities like Guangzhou, Zhaoqing, and Qingyuan being significantly affected [1][4]. - The phenomenon known as the "train effect" has caused successive thunderstorms to impact the same areas, exacerbating the rainfall intensity [4]. Group 3: Forecast and Future Conditions - Meteorological authorities predict that the heavy rainfall will cease by August 7, as the low vortex moves away from Guangdong [7]. - Following the rain, temperatures are expected to rise, with highs ranging from 34°C to 37°C, as the subtropical high-pressure system regains control [7].