A winter storm strengthened into a bomb cyclone off the Southeast coast, bringing powerful wind gusts and the most snow in decades to some areas.

Arctic air will chill much of the United States and could break New York’s record for consecutive freezing days.

"The dangerously cold wind chills as low as 20 below zero could cause frostbite on exposed skin in as little as 30 minutes. Frostbite and hypothermia will occur if unprotected skin is exposed to these...

A huge swath of the U.S. from the Gulf Coast into New England is mired in extra-cold temperatures after a bomb cyclone brought heavy snow.