中央气象台四预警齐发！东北局地降温可达16℃以上

Core Viewpoint - A significant weather change is expected in China, with a drop in temperatures and adverse weather conditions affecting travel during the Spring Festival return period [1][7]. Group 1: Temperature Changes - The Central Meteorological Administration forecasts a temperature drop of 6 to 10 degrees Celsius across most areas north of the Yellow River, with some regions experiencing drops of 12 to 16 degrees Celsius [2][3]. - Specific cities will see drastic temperature changes, such as Harbin's high dropping from 10 degrees Celsius to -8 degrees Celsius and Zhengzhou's high falling from 27 degrees Celsius to 9 degrees Celsius [3]. Group 2: Precipitation and Weather Warnings - Significant snowfall is expected in Inner Mongolia and Northeast China, with some areas receiving an additional 10 to 20 centimeters of snow [4][6]. - Widespread rainfall is anticipated in regions south of the Yellow River, with some areas experiencing severe convective weather [4][6]. Group 3: Impact on Travel - The weather changes, including strong winds and sandstorms, will significantly impact travel, particularly during the peak return period of the Spring Festival [7][8]. - The strongest winds are expected today, with gusts reaching 9 to 11 levels, and the sandstorm's intensity and range are predicted to be the largest this year [7].