今年首场寒潮有何特点

Core Viewpoint - The first cold wave of the year is significantly impacting various regions in China, with notable temperature drops and complex precipitation patterns expected to continue for several days [1][2][3]. Group 1: Characteristics of the Cold Wave - The cold wave has five main characteristics: a large impact area, significant temperature and precipitation changes, a complex range of rain and snow types, a notable risk of freezing rain, and relatively weak winds [2]. - The temperature drop is particularly pronounced in southern regions, with some areas experiencing a decrease of over 12 degrees Celsius, and localized drops reaching 16 degrees Celsius [3]. Group 2: Weather Forecast and Implications - The central meteorological authority has upgraded the emergency response to a level three due to the cold wave, with warnings for freezing and heavy snow [1]. - The core impact period of the snowfall is expected from January 19 to 20, with significant snowfall predicted in various northern regions [2]. - The cold wave is anticipated to weaken by January 21, but low temperatures in eastern regions may persist until January 25 [3].