返程天气必看！17省区市有扬沙或浮尘天气，北方迎剧烈降温

Core Viewpoint - The article discusses significant weather changes in China as the Spring Festival holiday concludes, with a cold wave affecting the northern regions and widespread rainfall in the south, urging the public to pay attention to weather forecasts and travel safely during the peak return period of the Spring Festival [1][9]. Group 1: Northern Region Weather - A cold wave blue alert was issued by the Central Meteorological Observatory, predicting temperature drops of 6 to 10 degrees Celsius in regions such as eastern Inner Mongolia, most of Heilongjiang, Jilin, northeastern Liaoning, and northern Jiangsu from 14:00 on the 22nd to 08:00 on the 23rd [1][9]. - Some areas, particularly southeastern Heilongjiang and northeastern Jilin, may experience temperature drops exceeding 12 degrees Celsius [1][9]. - The 0°C isotherm is expected to move southward to the eastern Huanghuai, southern North China, and central-southern Shaanxi by the 23rd [1][9]. Group 2: Southern Region Weather - The southern regions, previously experiencing warmer temperatures, will see a significant drop in maximum temperatures by around 10 degrees Celsius due to rainy weather, with the Jiangnan area maintaining maximum temperatures around 15 degrees Celsius from the 23rd to the 27th [2][12]. - For example, in Changsha, the maximum temperature is forecasted to decrease from 22 degrees Celsius today to 14 degrees Celsius in two days [2][12]. - The rainy conditions will lead to a damp and chilly feel in the southern regions [2][12]. Group 3: Precipitation and Snowfall - The Central Meteorological Observatory forecasts heavy snowfall in northeastern regions, with areas like northeastern Inner Mongolia, northern Heilongjiang, and high-altitude regions of central Shaanxi expecting significant snow accumulation of 6 to 10 centimeters, with localized areas exceeding 15 centimeters [6][15]. - Additionally, a large-scale rainfall event is anticipated in the southern regions, particularly in central and western Jiangnan and eastern Guizhou, with some areas experiencing heavy to torrential rain, thunderstorms, hail, and short-term heavy precipitation [6][15]. Group 4: Public Advisory - As the Spring Festival travel peak approaches, the public is advised to monitor weather forecasts and warnings closely, and to plan travel accordingly to mitigate the adverse effects of rain and snow on transportation [8][17].