雾和霾反复来扰！下周中后期较强冷空气登场 南方仍将阴雨频繁

Summary of Key Points Core Viewpoint - The article discusses the recent weather conditions in China, particularly focusing on the occurrence of dense fog in several regions, the expected changes in weather patterns, and the implications for air quality and temperature fluctuations. Group 1: Weather Conditions - Multiple regions including Beijing, Tianjin, Hebei, Henan, Shandong, Jiangsu, Anhui, and Hubei experienced dense fog, with visibility dropping below 50 meters in areas like Tongzhou, Dezhou, Shangqiu, Bengbu, and Huainan [1][3] - A red alert for fog was issued in Julu County, Hebei, indicating severe visibility issues [3] Group 2: Future Weather Predictions - Following the fog, the weather is expected to improve due to sunlight and weak cold air, with no significant smog forecasted for the next few days [3] - However, from November 4 to 7, the air quality in North China and the Huanghuai region is predicted to deteriorate again, leading to the return of fog and haze [5] Group 3: Temperature Trends - The temperature in central and southern North China is currently around or above 20°C, marking a recent high [8] - A significant drop in temperature is anticipated next week due to a strong cold air mass, with expected decreases of 4 to 8°C in many areas, and localized drops exceeding 10°C [8] Group 4: Rainfall and Flood Risks - From November 2 to 4, heavy rainfall is expected in the eastern Southwest, central and southern Jiangnan, eastern Guangxi, western Guangdong, and Hainan, with cumulative precipitation reaching 30 to 80 millimeters, and localized areas in Yunnan and Hainan potentially exceeding 200 millimeters [9][13] - The rainfall may lead to significant flooding risks in certain regions, particularly in Yunnan and southern Sichuan, where the rainfall could surpass the total for the entire month of October [13] Group 5: Tropical Weather Developments - The Japan Meteorological Agency has classified a tropical disturbance east of the Philippines as a tropical depression, which is expected to develop into Typhoon "Haigui" by November 5, with potential impacts on the South China Sea [14]