(CNN) — A major winter storm will deliver heavy snow, hazardous ice, rain and severe thunderstorms to more than 1,300 miles of the United States over the weekend and into next week.

Back-to-back storm systems are forecast to hit the Northeast this week as heavy snow is expected in the Plains region.

It's the nation's most serious severe threat since July. Here's what you need to know about this outbreak forecast.

A severe weather warning has been issued for parts of the United States after a deadly tornado struck this weekend. Tornadoes ...

The National Weather Service issued tornado warnings for the towns of Mebane, Hillsborough, Saxapahaw, and Efland. Raleigh ...

A strong storm system is threatening to whip up tornadoes in parts of the U.S. Southeast, a day after severe weather claimed ...

A tornado watch has been issued for 5 million people in parts of east Texas, much of Louisiana, and southern Mississippi.

Millions of people from across the South are under threat of damaging winds, strong tornadoes and hail Saturday as the region ...

Early Saturday, tornadoes were reported in multiple areas surrounding the Texas city home to more than 2 million people.

(CNN) — At least four people have died as severe thunderstorms batter the Southeast and East Coast on Sunday after deadly tornado-spawning storms tore through Texas and Mississippi, ripping off roofs ...

Neutral ground parking allowed until 8 a.m. on Sunday, Dec. 28. Tornado Watch remains in effect for Southeast LA and South MS ...