A blast of Arctic air from the polar vortex has brought dangerous, bone-chilling cold to a wide swath of the United States on Tuesday, stretching from the Dakotas through Maine, with snow expected as far south as Alabama and Georgia. Arctic air and icy conditions led schools to close, flights to be cancelled and railway officials to set fires on train tracks to prevent them from cracking.
Temperatures are dropping across the United States, which is bracing for one of the coldest Januarys it has seen in quite some time.
Chills, thrills and more in Nik Wallenda's death-defying feat