Severe weather is expected to bring subzero temperatures the northern Plains as soon as Thursday, then reach the Mississippi Valley, the Northeast and the Ohio Valley by Sunday.

A massive winter storm is disrupting swaths of the U.S., dropping snow, freezing roads and causing thousands of flight cancellations and power outages.

More than 100,000 customers were without power in Tennessee and Texas Sunday morning, with another 100,000 in Mississippi and more than 84,000 in Louisiana also without electricity, according to the o...