White Christmas hopes could be dashed by a big weather pattern change in December’s second half

Cold and snowy weather has gripped much of the northern tier of the United States since Thanksgiving, but a pattern change will torch the chance of white Christmas for many.

​ Cold and snowy weather has gripped much of the northern tier of the United States since Thanksgiving, but a pattern change will torch the chance of white Christmas for many. Read More Breaking News, Latest News and Videos | CNN