...Significant winter storm will "let it snow, let it snow, let it snow"over portions of the Central Plains on Christmas where blizzard conditionsand hazardous travel are anticipated; treacherous ice accumulationsexpected in the eastern Dakotas and northern Minnesota...Mixed Rain,sleet and snow for Northwest Iowa......Passing showers to make for a wet Christmas and Boxing Day in theSoutheast; new Pacific storm system to introduce more rain and mountainssnow over the Pacific Northwest Christmas night into Tuesday......Unusually mild temperatures along and east of the Mississippi Riverwith some record breaking warmth possible in the Midwest and Great Lakes...