Winter storm alerts are posted from the Rocky Mountains to the Great Lakes as the East Coast prepares for a powerful blast of ice and snow. In the South, a rare December outbreak of tornadoes has killed several people in Louisiana as the threat moves into Alabama and Florida. Elise Preston has the latest.

#tornado #louisiana #news

"CBS Evening News with Norah O'Donnell" delivers the latest news and original reporting, and goes beyond the headlines with context and depth. Catch the "CBS Evening News" weeknights at 6:30 p.m. ET on the CBS Television Network and at 10 p.m. ET on the CBS News app.

Subscribe to the "CBS Evening News" YouTube channel: https://bit.ly/1S7Dhik
Watch full episodes of "CBS Evening News": https://cbsn.ws/23XekKA
Follow "CBS Evening News" on Instagram: https://bit.ly/1T8icTO
Like "CBS Evening News" on Facebook: https://on.fb.me/1KxYobb
Follow "CBS Evening News" on Twitter: https://bit.ly/1O3dTTe
Download the CBS News app: https://cbsn.ws/1Xb1WC8
Try Paramount+ free: https://bit.ly/2OiW1kZ

For video licensing inquiries, contact: licensing@veritone.com