Violent tornadoes ripped through parts of the U.S., wiping out schools and toppling semitractor-trailers in several states.

MATTHEW CAPPUCCI: It's really not that closely linked to climate ... Realistically, if you're going to get big tornadoes, it'll be over Mississippi or Alabama this time of year.

It's really not that closely linked to climate ... Realistically, if you're going to get big tornadoes, it'll be over Mississippi or Alabama this time of year. That said, we do know that ...

A severe weather system spawned intense, long-duration tornadoes that struck parts of Arkansas, Mississippi and Missouri, leaving some communities in tatters.

Instead, it appears that the subjective tornado grading system – which is overseen by the National Weather Service – has gotten tougher on big tornadoes. "There is no evidence that the ...

The death toll from a sprawling outbreak of severe weather rose throughout the day Saturday as severe storms and reported tornadoes plagued the South. Nightfall Saturday will bring new dangers, as ...

A huge storm system crossing the U.S. threatens to unleash tornadoes Friday in the Mississippi Valley, blizzards in the northern Plains and dry, gusty conditions in Texas and Oklahoma that pose a ...

“And so what that is doing is producing really substantial impacts over a very large area.” The National Weather Service said it observed three evening tornadoes, including in south-central Missouri ...