Weather Impact Summary - Northern regions are experiencing significant cooling due to cold air activity, with temperature drops of over 8°C reported in some areas like Xinjiang [7][8] - Southern regions are facing a return of high temperatures, with forecasts indicating that cities such as Shanghai, Hangzhou, and Wuhan may see temperatures rise above 35°C by September 5 [7][8] Rainfall and Weather Patterns - Recent rainfall in the Jianghuai and Jiangnan regions has been intense, with localized heavy downpours reported, while the northwest has seen a notable increase in rainfall intensity [2][6] - The Central Meteorological Observatory predicts continued rainfall in various regions, including moderate to heavy rain in parts of Shaanxi, Gansu, and Qinghai [4][6] Public Advisory - Public is advised to take precautions against potential geological disasters in the northwest due to high rainfall intensity, particularly in areas like southern Shaanxi and central Gansu [6] - Recommendations include dressing appropriately for the cooler temperatures in the north and taking measures to prevent heat-related illnesses in the south [8]

Group 1 - The core viewpoint of the article indicates that the China Meteorological Administration forecasts significant cold air activity in northern regions during the May Day holiday, leading to noticeable temperature fluctuations [1] - The average temperature in North China and Northeast China is expected to be 1 to 3 degrees Celsius lower than the same period in previous years [1] - Most other regions are projected to have temperatures close to or higher than the historical average, with specific areas in the southeastern Northwest, Jianghan, Jianghuai, and western Huanghuai regions expected to be 3 to 4 degrees Celsius higher than the historical average [1]

Core Viewpoint - The article discusses the impact of cold air and warm moist air on weather patterns in China, highlighting significant temperature fluctuations and heavy rainfall in southern regions over the next few days [1][2][6]. Weather Patterns - Cold air is affecting the middle and lower reaches of the Yangtze River and areas north, leading to strong winds and temperature drops [1][6]. - Southern regions are experiencing frequent heavy rainfall, with the rain intensity expected to weaken during the day but strengthen again at night [2][3]. Regional Weather Forecast - Areas such as southern Jiangxi, central and southern Fujian, northern Guangdong, and parts of Guangxi are experiencing heavy rain, with some regions facing torrential downpours [2][3]. - The Central Meteorological Observatory predicts snowfall or sleet in northeastern Inner Mongolia, northwestern Heilongjiang, and other regions, with some areas expecting heavy snow [3][4]. Temperature Changes - The temperature in the Huanghuai region and north is expected to drop by 4 to 6 degrees Celsius, with some areas experiencing drops of over 8 degrees Celsius [6]. - Fluctuations in temperature are anticipated across most of the country, with some areas seeing highs around 30 degrees Celsius before dropping to around 20 degrees [6]. Future Weather Outlook - A new round of rainfall is expected in Jiangnan and northern South China from April 26 to 27, with cumulative rainfall likely to exceed normal levels for this time of year [5]. - The public is advised to pay attention to weather forecasts and warnings, especially regarding strong convective weather and its impact on transportation [6].