夹雪转小雪！河南将迎大范围降水

Group 1 - The core viewpoint of the article highlights the upcoming weather changes, including a significant temperature drop and the arrival of cold air masses affecting the region [3][4][6] - The first cold air mass is expected to arrive from the night of December 28 to December 30, primarily causing a drop in temperature [3][6] - The second cold air mass will begin affecting the area on December 31, bringing strong winds and continued low temperatures into the new year [4][6] Group 2 - The forecast indicates that the highest temperatures will decrease by 6 to 8 degrees Celsius by December 31, with the lowest temperatures expected to reach around -6 degrees Celsius by January 3 [6] - Visibility issues due to fog and potential road hazards from rain and snow are anticipated, urging the public to take precautions [8] - The weather forecast for the next three days includes mostly sunny to partly cloudy conditions, with specific mentions of fog in the eastern and southwestern regions [8][10][11][12][13]