中东部气温玩起“折返跑”，明天这些地方降温超10℃

Group 1 - A cold wave is affecting the central and eastern regions of China, with temperatures dropping by 10-20°C in many areas north of the Yangtze River [1] - The cold wave is expected to rapidly advance to the Jiangnan region, with maximum temperatures in areas from central Guizhou to Jiangnan dropping by 8-16°C [3] - Cities like Changsha will experience a significant temperature drop from around 25°C to 8°C, indicating a single-day temperature decrease of 17°C [5] Group 2 - Precipitation in the central and eastern regions is expected to be widespread but will show a weakening trend overall [7] - From February 17 to 19, light rain is expected in southern regions, with specific areas like Guizhou, Guangxi, and Fujian still experiencing small rain on the first day of the Lunar New Year [9] - Rainfall in the south will remain weak until the fifth day of the Lunar New Year, which is favorable for travel, although frequent overcast and rainy weather will persist in areas like Guizhou, Hunan, and Guangxi [10]