大范围停电、大量航班取消，美国“历史性”冬季风暴持续肆虐

Group 1 - A historic winter storm is affecting multiple states in the U.S., resulting in at least 10 fatalities, numerous flight cancellations, and widespread power outages [1][3] - 42 states have issued weather warnings, with snowfall exceeding 30 centimeters in many areas, and continued snowfall expected in the northeastern region [3] - The storm has led to extremely low temperatures, with some areas experiencing temperatures as low as -18°C, exacerbating traffic issues due to ice accumulation [3] Group 2 - Over 840,000 households are without power across the U.S., primarily in the southern states where most homes rely on electric heating [3] - The severe weather may be linked to a stretched polar vortex, which can lead to the release of cold air into North America [4]