中央气象台2月21日18时继续发布寒潮蓝色预警

Group 1 - The article discusses a blue cold wave warning issued by the Central Meteorological Observatory, predicting significant temperature drops across various regions in China from February 21 to February 23 [1] - It is expected that temperatures will decrease by 6 to 10 degrees Celsius in most parts of Inner Mongolia, northern Northwest China, northeastern China, northern North China, and eastern Huanghuai [1] - Specific areas such as eastern Inner Mongolia, southern Heilongjiang, most of Jilin, and northeastern Liaoning may experience temperature drops of 12 to 14 degrees Celsius, with some localities exceeding a drop of 14 degrees Celsius [1] Group 2 - The lowest temperature line of 0 degrees Celsius is forecasted to move southward to eastern Huanghuai, southern North China, and southern Shaanxi by February 23 [1] - The article includes a defense guideline for the cold wave, advising government and relevant departments to prepare for cold weather, individuals to dress warmly, and protective measures for tropical crops and aquatic products [4] - It also emphasizes the importance of preparing for wind protection during this cold wave event [4]