降温图变紫了！大范围雨雪冰冻持续，雪线再往南推

Core Viewpoint - A significant cold wave is impacting China, with temperatures dropping sharply across various regions, leading to the coldest period of the winter so far and extensive rain and snow events [1][3][4]. Group 1: Cold Wave Impact - The cold wave front has moved past the Yangtze River, with southern regions expected to experience the coldest temperatures during this event [1] - Northern areas are experiencing extreme cold, with temperatures in parts of Northeast China dropping below -10°C and some regions in Inner Mongolia falling below -20°C [3] - The temperature in the Yangtze River basin, which was previously warm, has now dropped to single digits [3] Group 2: Rain and Snow Events - The cold wave is interacting with warm, moist air, resulting in the strongest rain and snow events of the winter [4] - From 8 AM to 2 PM today, significant snowfall was reported in several provinces, including Gansu, Shaanxi, and Henan, with freezing rain observed in Xinyang, Henan [4] - The rain and snow line is expected to continue moving south, affecting areas such as Guangxi and parts of southern China [6][10] Group 3: Temperature Forecast - The coldest temperatures in southern regions are anticipated to occur in the next couple of days, with maximum temperatures around 0°C in the middle and lower reaches of the Yangtze River [8] - Major cities like Hefei, Wuhan, and Nanjing may experience their lowest temperatures of the winter, with some areas potentially dropping below 0°C for the first time this season [8] - The cold wave's effects are expected to persist for an extended period, particularly in areas north of the Yangtze River, with another weak cold air mass expected to arrive after the 25th [9] Group 4: Weather Conditions and Precautions - The rain and snow will continue to be widespread, with heavy snow expected in regions such as Henan and Hubei, and some areas may experience blizzard conditions [10] - The precipitation process is characterized by complex forms of precipitation, including freezing rain, which poses significant risks to transportation, agriculture, and power infrastructure [13] - The precipitation event is expected to conclude on the 22nd, after which warmer, drier conditions will return to much of the central and eastern regions [12]