A late-winter blizzard pounded U.S. Rocky Mountain and Plains states on Wednesday, unleashing a "bomb cyclone" of high winds and drifting snow that stranded motorists, canceled airline flights and forced government offices, schools and businesses to close. The National Weather Service issued blizzard warnings for parts of Colorado, Wyoming, Nebraska and the Dakotas as local authorities urged residents to hunker down and avoid traveling during the storm if possible. Meteorologists call storms like this one a "bomb cyclone," a winter hurricane that forms when the barometric pressure drops 24 millibars in 24 hours.
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