Group 1 - The article discusses the impact of Typhoon "Hua Jasha," which has rapidly intensified and is expected to make landfall in Guangdong, affecting weather patterns in Zhejiang province [1][2] - The typhoon's outer circulation will bring rain to Zhejiang, particularly affecting coastal areas and leading to potential heavy rainfall in cities like Wenzhou, Taizhou, and Ningbo [2] - A new cold air mass is expected to arrive on Wednesday, which will further enhance rainfall in the region, particularly in the western and northern parts of Hangzhou [2] Group 2 - The weather forecast indicates that even after the typhoon's influence diminishes, residual moisture and a strengthening subtropical high will continue to bring thunderstorms and rain to the province [2] - The article notes that the active tropical systems and cold air will likely keep precipitation levels high throughout the month, with a significant cold air event expected around Sunday [2] - The arrival of autumn is anticipated as the average date for the season's onset approaches, with indications that cooler weather is on the horizon [2]

Group 1 - The city of Guangzhou is expected to experience heavy rain to torrential rain starting from September 7 due to the influence of a tropical system, which will alleviate high temperatures [1][2] - The Guangzhou Flood Control and Drought Relief Headquarters reported that as of September 4, the average rainfall in the city was 1853.5 mm, which is higher than the normal level of 1653.7 mm for the same period but lower than last year's 2307.6 mm [1] - The city has activated emergency responses 46 times this year, including 41 for heavy rain and flooding, 4 for typhoons, and 1 for flood control [1] Group 2 - The upcoming rainfall is expected to cause significant rises in water levels in small and medium rivers, with changes ranging from 1 meter to 3 meters, and some rivers may approach warning levels [2] - The Pearl River Estuary will experience notable storm surge, coinciding with astronomical tides, which may lead to tidal levels exceeding warning thresholds in certain sections of the Pearl River [2] - From September 9 to 10, Guangzhou will see heavy rain to torrential rain, with a transition to mainly overcast weather starting September 11 [2]

Core Insights - Since July, northern China has experienced multiple rounds of heavy rainfall, with significant overlap in precipitation areas, particularly from July 23 to 29, where regions like Qinghai, Gansu, Inner Mongolia, Beijing-Tianjin-Hebei, and Northeast China faced heavy to extremely heavy rainfall [1][3] Weather Patterns - The recent heavy rainfall in northern and northwestern China is directly related to abnormal atmospheric circulation. The intensity of the western Pacific subtropical high has been stronger and positioned further north, creating favorable conditions for sustained heavy rainfall in the north [3] - The active tropical systems in the southern ocean during mid to late July have further enhanced moisture transport to northern regions, contributing to the persistent heavy rainfall [3] - Geographical features also play a significant role, as the terrain in regions like the Yinshan, Taihang, and Yanshan mountains facilitates the uplift and convergence of warm, moist air, leading to repeated heavy rainfall events in areas like Beijing and Hebei, resulting in significantly higher cumulative precipitation compared to historical averages [3]