断崖式降温，来了！

Core Viewpoint - The article discusses the significant drop in temperatures across northern and southern China due to a strong cold air mass, with northern regions experiencing temperatures 8 to 10 degrees Celsius lower than the average for this time of year, while southern regions will also see record low temperatures [2][3]. Summary by Sections Northern China Weather - From October 19 to 20, northern temperatures will remain low, with maximum temperatures generally 8 to 10 degrees Celsius below the seasonal average, comparable to early to mid-November levels. For instance, Taiyuan is expected to reach only 7 degrees Celsius on the 20th, marking the lowest temperature since the start of autumn [2][3]. - Minimum temperatures in northern regions will also set new lows, with much of Northeast China dropping below zero and many areas in North China just above 0 degrees Celsius [2]. Southern China Weather - In southern China, temperatures will continue to decline, with regions like Jiangnan expected to see maximum temperatures below 20 degrees Celsius around October 21. For example, Fuzhou's maximum temperature is projected to drop from over 35 degrees Celsius on the 18th to 21 degrees Celsius by the 21st [2][3]. Rain and Typhoon Impact - The article highlights ongoing rain in the southwestern and southeastern regions, with a blue alert for Typhoon "Fengshen" issued by the Central Meteorological Observatory. The typhoon is expected to strengthen as it moves towards the South China Sea, potentially reaching strong tropical storm or typhoon levels [3][5]. - Rainfall is anticipated in various regions, including small to moderate rain in the eastern southwestern and southeastern northwestern areas, with some regions experiencing snow or sleet [5][6][7]. Safety Advisory - Public safety is emphasized, advising individuals to carry rain gear due to wet conditions and reduced visibility, especially with the approaching typhoon impacting southern coastal areas [9].