中央气象台暴雪、寒潮、冰冻三预警齐发，安徽、河南、湖南、贵州等四省启动国家低温雨雪冰冻灾害四级应急响应

Core Viewpoint - The Central Meteorological Administration has issued multiple weather warnings, including a blue snow warning, yellow cold wave warning, and yellow freezing rain warning, indicating significant weather events affecting various regions in China from January 18 to January 21 [1][4][10]. Group 1: Weather Warnings - A blue snow warning predicts heavy snow in parts of southern Shaanxi, central and southern Henan, northern Anhui, and northwestern Hubei, with snowfall accumulation of 4 to 8 centimeters, and localized areas exceeding 10 centimeters [1]. - A yellow cold wave warning forecasts a temperature drop of 6°C to 12°C across central and eastern China, with some areas experiencing drops of 12°C to 14°C, and localized drops exceeding 16°C [4]. - A yellow freezing rain warning indicates the possibility of freezing rain or ice pellets in southeastern Henan, western Anhui, and parts of Hubei, Shaanxi, and northern Chongqing, with freezing rain amounts ranging from 1 to 3 millimeters, and localized areas reaching 8 millimeters [10]. Group 2: Defense Guidelines - Government and relevant departments are advised to prepare for snow disasters and freezing damage, including maintenance of transportation, electricity, and communication infrastructure [3][9]. - Individuals are urged to dress warmly, take care of vulnerable populations, and implement protective measures for livestock, crops, and other agricultural products [9][12]. - Emergency response measures have been initiated in response to the severe weather, focusing on ensuring safety, maintaining transportation, and providing essential services [13].