LIVE UPDATES: Winter storm left millions without power, at least 20 dead

Deadly winter storms, record lows blast US

Casey Stegall reports from Dallas, Texas on the dangerous conditions and future forecast.

At least 20 people were dead as of late Tuesday after a winter storm swept across the U.S.

The winter storm left millions without power, bringing record-breaking cold weather, overwhelming power grids and immobilizing the Southern Plains.