Tens of millions of Americans are bracing for a powerful storm that could bring heavy snow and the coldest weather in more than a decade.
The storm, which started in the central United States, will move eastward in the coming days, according to the National Weather Service (NWS).
A state of emergency has been declared in the states of Kentucky and Virginia, while many parts of the United States not known for extreme cold, such as Mississippi and Florida, have been warned to expect unusual conditions.
