The massive winter storm that brought dangerous ice and snow to the southern United States on Wednesday is now moving to the Northeast. Hundreds of thousands are without power, and more than a dozen states are under watches and warnings. “This is a storm of historical proportions with potentially catastrophic ... crippling impacts,” the National Weather Service in Atlanta warned Wednesday morning. Yahoo News is live-blogging the latest developments via social media and other sources. Join the conversation and let us know what’s happening where you live.