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.
View the latest weather forecasts, maps, news and alerts on Yahoo Weather. Find local weather forecasts for Spring, United States throughout the world ...
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