最强冷空气，发力了

Core Viewpoint - A strong cold air mass is affecting China, leading to significant temperature drops across various regions, with the coldest temperatures of the second half of the year expected in the coming days [1][3]. Group 1: Temperature Changes - The cold air mass is causing temperatures in the central and eastern regions to drop by 4 to 8 degrees Celsius, with some areas experiencing drops exceeding 10 degrees Celsius [3][11]. - In northern cities like Beijing, temperatures have reached new lows for the year, with the minimum temperature recorded at -0.5 degrees Celsius [3][5]. - The lowest temperature line is expected to move southward to northern parts of Shaanxi and eastern Gansu, indicating a significant shift in weather patterns [11][13]. Group 2: Impact of Typhoon "Fengshen" - Typhoon "Fengshen" is contributing to the temperature fluctuations in eastern and southern China, although it is not making landfall [7][9]. - The typhoon is enhancing wind strength in eastern and southern sea areas, with wind speeds reaching 11-12 levels, causing temperature drops of 6 to 10 degrees Celsius across Guangdong and other regions [9][11]. Group 3: Public Advisory - Due to the drastic temperature changes, the public is advised to dress warmly and take precautions against the cold [18].