Blizzard warnings have been issued across the Central Plains, threatening Christmas Day travelers with delays and dangerous road conditions.

More than 1.1 million people in parts of Nebraska, South Dakota, Kansas, Colorado and Wyoming were under blizzard warnings on Monday afternoon.

“Significant winter storm will ‘let it snow, let it snow, let it snow’ over portions of the Central Plains on Christmas where blizzard conditions and hazardous travel are anticipated; treacherous ice accumulations expected in the eastern Dakotas and northern Minnesota,” the National Weather Service said early Monday.