Group 1 - The core viewpoint of the articles highlights the severe weather conditions in China, particularly the "north flood, south drought" pattern expected during the main flood season from July to August, with significant rainfall in northern regions and drought in southern areas [1][2] - The Central Meteorological Administration has issued an orange rainstorm warning, predicting heavy rainfall in various regions including Inner Mongolia, Heilongjiang, and parts of Beijing and Tianjin from July 28 to 29 [1] - Since July 23, northern China has experienced continuous heavy rainfall, with 19 national meteorological stations breaking historical monthly extreme values, indicating a significant increase in precipitation [1] Group 2 - The rainfall in southern China is primarily influenced by the easterly wind system, characterized by widespread but scattered precipitation, while northern rainfall is affected by the westerly wind belt and subtropical high, leading to more concentrated and stable rain bands [2] - The complexity of the heavy rainfall in North China is attributed to sufficient moisture transport from summer winds, the influence of cold air from the westerly wind belt, and the topographical uplift from mountains like the Taihang, which enhances precipitation efficiency [2] - The recent abnormal wet and hot weather in northern China is linked to a northward shift of the main rainy center, indicating that these regions have become wetter compared to over a decade ago, although this does not imply a fundamental climate change [3]