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Arctic blast and sprawling winter storm set to sweep U.S., threatening crippling ice, travel chaos and power outages Snow has begun falling across parts of Texas, Oklahoma and Kansas in a frosty prelude to a major winter storm expected to merge with bitter Arctic air and engulf much of the United States this weekend from the Rockies to the Eastern Seaboard. Forecasts warn of heavy snow, sleet and freezing rain coupled with dangerously low temperatures that could upend travel and trigger widespread power failures. At least 14…