突发！超1500架次航班，紧急取消！美国突然宣布！

Group 1 - A severe winter storm has impacted Southern California during Christmas, resulting in at least 4 fatalities and emergency declarations in New York and New Jersey [1][2] - Over 1500 flights were canceled due to the storm, with New York City and Philadelphia International Airport being the most affected [2][8] - The storm has caused significant rainfall in Los Angeles, with 95.5 mm recorded over five days, surpassing the average December rainfall of 63 mm [2][8] Group 2 - The recent severe weather events in the U.S. and Asia may signal the return of the La Niña phenomenon, which disrupts global weather systems and poses risks to agriculture and supply chains [4][11] - The World Meteorological Organization has indicated a 55% chance of a weak La Niña affecting global weather patterns from December 2025 to February 2026 [4][11] - Historical data shows that La Niña has caused global economic losses ranging from $258 billion to $329 billion in recent years [4][11] Group 3 - La Niña typically leads to colder winters in North America and East Asia, increasing demand for heating fuels [12] - The phenomenon is associated with reduced yields of key crops such as corn, rice, and wheat, raising concerns in the global agricultural market [5][11] - Current forecasts suggest that the ongoing La Niña may peak in the coming weeks, with its effects on global weather patterns expected to last for several months [6][12]