A rare weather phenomenon rumbled across several eastern and central U.S. states this weekend as Arctic air continues to bring heavy snow and freezing temperatures to millions of Americans.
Thundersnow, also known as a winter thunderstorm, happens when a snowstorm is accompanied by thunder and lightning. As of Monday (Jan. 6) morning, the phenomenon has been reported across much of the southern Midwest as well as in Maryland, Virginia and Washington, D.C.
