美国多地遭冬季风暴席卷 预计将影响超4000万人

Group 1 - The core viewpoint of the article highlights the issuance of winter storm warnings in parts of Pennsylvania, Vermont, and Maine, indicating severe weather conditions including freezing rain and strong winds [1] - The central United States, including Minnesota, Iowa, and North Dakota, has issued blizzard warnings, with adverse weather expected to last until the morning of December 29 [1] - It is estimated that over 40 million people in the northeastern and midwestern regions of the United States will be affected by this winter storm [1]