As millions of Americans hunker down for the winter storm, 19 states and Washington, D.C., have declared states of emergency.

Track the winter storm as it's forecasted to bring heavy snow and extremely cold weather to the U.S., reaching millions from the southern U.S. to the Northeast.

Add Yahoo as a preferred source to see more of our stories on Google. A series of winter storms bringing rounds of snow from the Midwest to the Northeast. (AccuWeather) A series of fast-moving winter ...

Add Yahoo as a preferred source to see more of our stories on Google. More than 3,000 flights were canceled or delayed across the United States on Sunday after a winter storm packing ice and snow ...

A massive winter storm named fern is set to sweep across much of the United States, bringing snow, ice and extreme cold. Over ...

More than 3,000 flights were canceled or delayed across the United States on Sunday after a winter storm packing ice and snow slammed the Midwest and Great Lakes regions during the busy travel period ...