As tornadoes popped up from Kansas to Kentucky, a depleted National Weather Service was in scramble mode.

Tornado experts say the winter’s record warmth provided the key ingredient for a Midwest outbreak of deadly tornadoes and damaging gorilla hail that hit parts of the Midwest Wednesday and Thursday.

Experts say a natural La Nina weather pattern, unusually warm moist air juiced by climate change, and long-term shift in where tornadoes hit all are factors in Thursday's devastating tornado in Alabama.

The 21st century tornado problem is far different from ‘The Wizard of Oz.’ Killer tornadoes hit the Southeast far more than they do in Kansas, Oklahoma or Texas.

A new study says winter tornadoes, like the devastating one that hit five states last week, are likely to be stronger and stay on the ground longer as the world warms.